BrainMap

Cristina Chirila

Researcher - INSTITUTUL NATIONAL DE CERCETARE - DEZVOLTARE PENTRU FIZICA MATERIALELOR BUCURESTI RA

Researcher

Web of Science ResearcherID: RID:A-2413-2012

Curriculum Vitae (20/02/2024)

Expertise & keywords

Memristive multiferroic junctions Call name: P 2 - SP 2.1 - Proiect experimental - demonstrativ
PN-III-P2-2.1-PED-2021-0378 2022 - 2024

Role in this project:

Coordinating institution: INSTITUTUL NATIONAL DE CERCETARE - DEZVOLTARE PENTRU FIZICA MATERIALELOR BUCURESTI RA

Project partners: INSTITUTUL NATIONAL DE CERCETARE - DEZVOLTARE PENTRU FIZICA MATERIALELOR BUCURESTI RA (RO)

Affiliation:

Project website: https://infim.ro/en/project/memristive-multiferroic-junctions-mms/

Abstract:

Versatile multi-level memristive elements based on multiferroic tunnel junctions have outstanding features determined by the possibility to modulate the junction’s current by independently controlling the magnetization orientation of the ferromagnetic electrodes and the ferroelectric polarization of the tunnel barrier. The coupling of these magneto-electric properties is one of the most active field of research in materials sciences opening a large spectrum of technological applications from nonvolative memory, to elements in logic circuits, sensing devices, energy harvesting, biological synapses models in the emerging area of neuromorphic computing and artificial intelligence. Herein, we will demonstrate the multi-memristive spintronic states behavior of multiferroic tunnel junctions in elements with two terminals composed of nanoscale tunneling barrier consisting on organic ferroelectric films and for the first time of biomolecules, sandwiched between two different magnetic Heusler alloys electrodes. The realization of these resistive states – a transition from TRL2 to TRL3 level - will be controlled by the dependence of the tunneling current through this heterostructure on the electrical polarization of the ferroelectric film (the tunneling electroresistance) and on the relative orientation of the magnetization of the magnetic electrodes (the tunneling magnetoresistance). Moreover, a reciprocal influence between the electric and the magnetic properties can be realized by the control of the magneto-electric coupling at the interfaces using multifunctional effects associated to temperature or mechanical changes, i.e. the pyro- and piezo-electric properties of the ferroelectrics and the magneto-caloric, magneto-restrictive and the strong spin-polarization effects of the chosen compounds of the magnetic electrodes.

Electronic double layer high mobility Mott transistors Call name: P 4 - Proiecte de Cercetare Exploratorie, 2020
PN-III-P4-ID-PCE-2020-2540 2021 - 2023

Role in this project:

Coordinating institution: INSTITUTUL NATIONAL DE CERCETARE - DEZVOLTARE PENTRU FIZICA MATERIALELOR BUCURESTI RA

Project partners: INSTITUTUL NATIONAL DE CERCETARE - DEZVOLTARE PENTRU FIZICA MATERIALELOR BUCURESTI RA (RO)

Affiliation:

Project website: https://motttransistors.wordpress.com/

Abstract:

A field-effect LaAlO3/SrTiO3 - based transistor, with enhanced mobility, operated through electrolyte gating will be designed. This will be accomplished by merging the most advanced preparation techniques with the knowledge already available to the date on oxide electronics, highly supported by the expertise of the implementation team. The infrastructure available in NIMP allows the preparation of engineered LaAlO3/SrTiO3 - LAO/STO heterostructures, which is known to host a two dimensional electron gas at the interface (2DEG) [1-4]. Enhancing the 2DEG mobility will be achieved by furher inserting Mott insulators (MIs) buffer layers at the LAO/STO interface in order to alter the interface electronic structure and boost the mobility through modulation of carrier concentration in the 2DEG. The drain current will be modulated by n or p field effect doping of the interface region. The device will be operated in a double layer transistor configuration through electrolyte top gating. This allows to effectively bias our devices, overcoming the well-known effects of contact breakdown due to high voltages required to drive the all-oxide transistors. The gates of our transistor will be patterned at micron scale by a combination of litography and lift-off techniques, depositing Au/Ti contacts, then the top, gate region will be covered by ionic polymers/gels (or ionic liquids) used as the electrolyte which, under bias will form the double layer

Optimization of stable multi-polarization states in ferroelectric heterostructures Call name: P 1 - SP 1.1 - Proiecte de cercetare pentru stimularea tinerelor echipe independente
PN-III-P1-1.1-TE-2019-0709 2021 - 2022

Role in this project:

Coordinating institution: INSTITUTUL NATIONAL DE CERCETARE - DEZVOLTARE PENTRU FIZICA MATERIALELOR BUCURESTI RA

Project partners: INSTITUTUL NATIONAL DE CERCETARE - DEZVOLTARE PENTRU FIZICA MATERIALELOR BUCURESTI RA (RO)

Affiliation: INSTITUTUL NATIONAL DE CERCETARE - DEZVOLTARE PENTRU FIZICA MATERIALELOR BUCURESTI RA (RO)

Project website: https://infim.ro/en/project/optimization-of-stable-multi-polarization-states-in-ferroelectric-heterostructures/

Abstract:

Ferroelectric based heterostructures may hold the key to increasing storage capacity in computer systems. Non-volatile ferroelectric random access memories have been shown to have better stability and speed of read/write cycles than traditional RAM technology. However, the storage requirements of future applications are ever increasing which means that FeRAM must overcome not only the production cost of traditional RAM but also the storage capacity in order to become a viable replacement. Unfortunately, miniaturization is limited by ferroelectric properties of layers and increasing the number of stable polarization states is the only viable option. By using two or more ferroelectric layers separated by insulators, one can create more than two ferroelectric states due to polarization coupling between ferroelectric layers. The proposed project will focus on understanding the nature of the polarization coupling across the insulator layer and controlling the stability of the multiple polarization states. Such a study will be performed both through theoretical investigations and experimental fabrication of devices. The theoretical aspect will be concentrated on numerical calculations using density functional methods to investigate the ferroelectric/insulator interfaces and the stability of the polarization states. These results will be combined with thermodynamic models to obtain the polarization hysteresis characteristics that can be compared directly to the experimental reality. Structural characterization of fabricated ferroelectric/insulator/ferroelectric heterostructures will provide important clues for the interface regions which can be used to optimize the numerical calculations. The research team has been assembled in order to balance the two proposed objectives through extensive accumulated experience in both theoretical modelling and experimental fabrication and characterization.

High-k Nanoparticle Multilayer Dielectrics for Nanoelectronics and Energy Storage Applications Call name: P 4 - Proiecte Complexe de Cercetare de Frontieră
PN-III-P4-ID-PCCF-2016-0175 2018 - 2022

Role in this project:

Coordinating institution: UNIVERSITATEA "ŞTEFAN CEL MARE" DIN SUCEAVA

Project partners: UNIVERSITATEA "ŞTEFAN CEL MARE" DIN SUCEAVA (RO); UNIVERSITATEA "ALEXANDRU IOAN CUZA" IASI (RO); INSTITUTUL NATIONAL DE CERCETARE - DEZVOLTARE PENTRU FIZICA MATERIALELOR BUCURESTI RA (RO); INSTITUTUL NATIONAL DE CERCETARE DEZVOLTARE PENTRU FIZICA LASERILOR, PLASMEI SI RADIATIEI - INFLPR RA (RO)

Affiliation: INSTITUTUL NATIONAL DE CERCETARE - DEZVOLTARE PENTRU FIZICA MATERIALELOR BUCURESTI RA (RO)

Project website: http://nanomat.usv.ro/pagina-05-5-a.php

Abstract:

Dielectrics are insulating materials that have been the workhorse in computing and electronics. Since the invention of the transistor and the integrated circuit the modern complementary metal oxide-semiconductor (CMOS) technology heavily relied on rigid SiO2/Si substrates and the relentless downscaling of the size of the transistor has been the core driver for the information revolution. However, to meet the increasing need for miniaturization, low power function and portability in both the civilian and military sector, discrete electronic components, such as capacitors, resistors, inductors and transistors should be replaced by embedded circuitry. An important roadblock in the development of energy storage and memory/switching devices with increased efficiency and range of operation is the rather low dielectric permitivity and carrier mobilities of organic polymer materials. The four research teams of the present consortium, led by A. Rotaru (USV, Suceava), L. Mitoseriu (UAIC, Iasi), I. Pintilie (NIMP, Bucharest) and A. Marcu (INFLPR, Bucharest), propose to demonstrate proof concept of manufacturable nanocrystal film structures with a high dielectric permitivity with direct applications in high energy density storage and low-voltage modulated field effect transistors and logic devices. In addressing these challenges we will use complementary expertise in materials synthesis and characterization, device design and testing with the potential of disruptive innovation in flexible electronics.

Controlling the electronic properties in heterostructures based on ferroelectric perovskites: from theory to applications Call name: P 4 - Proiecte Complexe de Cercetare de Frontieră
PN-III-P4-ID-PCCF-2016-0047 2018 - 2022

Role in this project: Key expert

Coordinating institution: INSTITUTUL NATIONAL DE CERCETARE - DEZVOLTARE PENTRU FIZICA MATERIALELOR BUCURESTI RA

Project partners: INSTITUTUL NATIONAL DE CERCETARE - DEZVOLTARE PENTRU FIZICA MATERIALELOR BUCURESTI RA (RO); INSTITUTUL NATIONAL DE CERCETARE - DEZVOLTARE PENTRU FIZICA MATERIALELOR BUCURESTI RA (RO); INSTITUTUL NATIONAL DE CERCETARE DEZVOLTARE PENTRU TEHNOLOGII IZOTOPICE SI MOLECULARE I N C D T I M (RO); UNIVERSITATEA POLITEHNICA DIN BUCURESTI (RO)

Affiliation: INSTITUTUL NATIONAL DE CERCETARE - DEZVOLTARE PENTRU FIZICA MATERIALELOR BUCURESTI RA (RO)

Project website: http://infim.ro/en/project/control-of-electronic-properties-in-ferroelectric-perovskite-heterostructures-from-theory-to-applications/

Abstract:

The main objective of the project is to obtain ferroelectric materials with controlled electronic properties at the same level as this properties are controlled in Si. This will be realized by hetero-valent doping, correlated with stress engineering and band gap engineering without affecting, as much as possible, the ferroelectric properties. The main objective is complex and ambitious because, up to date, there was no experimental demonstration that it possible to obtain n or/and p type conduction in epitaxial ferroelectrics. The successful achievement of this objective will open a new domain, that of ferroelectric electronics or ferrotronics, by producing electronic devices of p-n homo-junction type or junction transistors with ferroelectric materials. Two types of materials are envisaged, namely lead titanate-zirconate (PZT with tetragonal structure and a mixed bismuth ferrite (BFO) with bismuth chromit (BCO). In the first case the heterovalent doping will be studied on Pb or Zr/Ti sites with the aim to obtain n and p type conduction. The final goal is to produce a p-n homo-junction based on epitaxial PZT films. In the second case band gap engineering will be tested by varying the Fe/Cr content, and the dominant conduction mechanism will be identified, the goal being to use the material in photovoltaic applications. The activities will contain: theoretical studies regarding the relation between dopants, electronic properties and the ferroelectricity, including self-doping effects or electrostatic doping; target preparation for deposition of thin films; epitaxial growth of the film; characterization activities of the structure and physical properties. Not only classic doping in the target is envisaged but also doping during the epitaxial growth. The consortium is composed of 4 teams from three different institutions, including a number of 14 young researchers full time equivalent.

New advanced nanocomposites. Technological developments and applications Call name: P 1 - SP 1.2 - Proiecte complexe realizate in consorții CDI
PN-III-P1-1.2-PCCDI-2017-0871 2018 - 2021

Role in this project:

Coordinating institution: INSTITUTUL NATIONAL DE CERCETARE - DEZVOLTARE PENTRU FIZICA MATERIALELOR BUCURESTI RA

Project partners: INSTITUTUL NATIONAL DE CERCETARE - DEZVOLTARE PENTRU FIZICA MATERIALELOR BUCURESTI RA (RO); INSTITUTUL NATIONAL DE CERCETARE-DEZVOLTARE PENTRU OPTOELECTRONICA INOE 2000 INCD (RO); UNIVERSITATEA DE VEST TIMISOARA (RO); ACADEMIA ROMANA FILIALA TIMISOARA (RO); UNIVERSITATEA BABES BOLYAI (RO); INSTITUTUL NATIONAL DE CERCETARE-DEZVOLTARE PENTRU FIZICA TEHNICA-IFT IASI (RO); INSTITUTUL NATIONAL DE CERCETARE DEZVOLTARE PENTRU FIZICA LASERILOR, PLASMEI SI RADIATIEI - INFLPR RA (RO); INSTITUTUL NATIONAL DE CERCETARE- DEZVOLTARE PENTRU MICROTEHNOLOGIE - IMT BUCURESTI INCD (RO); UNIVERSITATEA "DUNAREA DE JOS" (RO); UNIVERSITATEA TRANSILVANIA BRASOV (RO); Ministerul Apararii Nationale prin Centrul de Cercetare Stiintifica pentru Aparare CBRN si Ecologie (RO)

Affiliation: INSTITUTUL NATIONAL DE CERCETARE - DEZVOLTARE PENTRU FIZICA MATERIALELOR BUCURESTI RA (RO)

Project website: http://infim.ro/project/kuncser_noi_directii_de_dezvoltare_tehnologica_si_utilizare_nanocompozite_avansate_47pccdi_2018

Abstract:

The development of complex nanocomposite materials consisting of different matrices (polymer-like, oxides, intermetallics, liquids) functionalized by different nasnostructured additions (carbon allotropes, magnetic nanoparticles with different organizations, nanostructured semiconductors, etc.) is the aim of this project. The unique combinations of interacting nanophases offeres to the hybrid nanocomposite material new or enhanced proprieties of high interest for applications. In this context, according to the previous experience of the involved teams, the complex project (formed by 4 component projects) is focused on the development of new optimized nanocomposite systems to be included in experimental demonstrators or final products to be transferred to economical companies. The project will contribute both to an increased scientific visibility of the partners as well as to enhancing the institutional performances by the development of new technical and scientific capacities.

Technologic paradigms in synthesis and characterization of variable dimensionality systems Call name: P 1 - SP 1.2 - Proiecte complexe realizate in consorții CDI
PN-III-P1-1.2-PCCDI-2017-0152 2018 - 2021

Role in this project:

Coordinating institution: INSTITUTUL NATIONAL DE CERCETARE - DEZVOLTARE PENTRU FIZICA MATERIALELOR BUCURESTI RA

Project partners: INSTITUTUL NATIONAL DE CERCETARE - DEZVOLTARE PENTRU FIZICA MATERIALELOR BUCURESTI RA (RO); INSTITUTUL NATIONAL DE CERCETARE-DEZVOLTARE PENTRU TEHNOLOGII CRIOGENICE SI IZOTOPICE - I.C.S.I. RAMNICU VALCEA (RO); UNIVERSITATEA DE VEST TIMISOARA (RO); INSTITUTUL NATIONAL DE CERCETARE- DEZVOLTARE PENTRU MICROTEHNOLOGIE - IMT BUCURESTI INCD (RO); INSTITUTUL NATIONAL DE CERCETARE-DEZVOLTARE PENTRU FIZICA TEHNICA-IFT IASI (RO)

Affiliation: INSTITUTUL NATIONAL DE CERCETARE - DEZVOLTARE PENTRU FIZICA MATERIALELOR BUCURESTI RA (RO)

Project website: http://infim.ro/project/vardimtech/, http://infim.ro/project/vardimtech-en

Abstract:

Last decades brought a considerable development of technologies based on ordered systems. Starting with semiconductor physics and photovoltaics, technologies soon evolved towards the utilisation on large scale of thin films and of surface / interface properties. Example go nowadays from data storage and readout (electrostatic or magnetic memories, giant magnetoresistance) to catalysis, gas sensors or photocatalysis (surface phenomena), and towards interfaces with biological matter (biosensors, templates for tissue reconstruction, interfaces between biological electrical signals and microelectronics). In Romania, crystal growth is performed since half a century; nevertheless, during the last years these activities fade out and need to be seriously reinforced, especially with the advent of new laser and detector technologies required by the Extreme Light Infrastructure facilities. Also, surface science started to be developped seriously only during the last decade, together with techniques involving self-organized nanoparticles, nanoparticle production etc. The main goal of this Project is to gather the relevant experience from the five partners, namely the experience in crystal growth from the University of Timișoara, with the surface science, nanoparticle and nanowire technologies developped by NI of Materials Physics, the cryogenic and ultrahigh vacuum techniques provided by the NI for Cryogenic and Isotopic Technologie, and the experience in ordered 2D systems (graphene and the like) owned by the NI for Microtechnologies (IMT). This common agenda will result in a coherent fostering of technologies relying on ordered systems of variable dimensionalities: 0D i.e. clusters or nanoparticles, including quantum dots; 1D i.e. free and supported nanowires and nanofibers; 2D: surfaces, interfaces and graphene-like systems; and 3D crystals of actual technological interest, together with setting up new ultrahigh vacuum, surface science and electron spectroscopy techniques.

Intrinsic properties in microwave dielectric materials investigated by terahertz time-domain spectroscopy Call name: P 1 - SP 1.1 - Proiecte de cercetare pentru stimularea tinerelor echipe independente
PN-III-P1-1.1-TE-2016-1711 2018 - 2020

Role in this project: Key expert

Coordinating institution: INSTITUTUL NATIONAL DE CERCETARE - DEZVOLTARE PENTRU FIZICA MATERIALELOR BUCURESTI RA

Project partners: INSTITUTUL NATIONAL DE CERCETARE - DEZVOLTARE PENTRU FIZICA MATERIALELOR BUCURESTI RA (RO)

Affiliation: INSTITUTUL NATIONAL DE CERCETARE - DEZVOLTARE PENTRU FIZICA MATERIALELOR BUCURESTI RA (RO)

Project website: http://infim.ro/en/project/intrinsic-properties-in-microwave-dielectric-materials-investigated-by-terahertz-time-domain-spectroscopy

Abstract:

The main goal of the project is the investigation of extrinsic sources that degrade the complex permittivity of low-loss dielectrics/ ferroelectrics in microwaves, millimeter-waves, and submillimeter-waves. The studies will be focused on the broad-band frequency behavior of bulk dielectrics (titanates, tantalates, niobates) and thin/thick film ferroelectrics (barium tinanate-based films) with different microstructures. In this sense, samples will be prepared by using several experimental techniques (conventional ceramic technology, spark plasma sintering, radio frequency–magnetron sputtering, and pulsed laser ablation deposition). Apart of usual structural and morphological characterizations (X-ray diffraction, electron microscopy), the extrinsic contribution to the complex permittivity will be investigated with following innovative techniques: terahertz time-domain spectroscopy, split ring resonator, quasi-optical free-space measurements, and spectroscopic ellipsometry. It is aimed to solve through the analysis of the synthesis - microstructure - properties cycle a very important scientific and applied problem of national and international interest. This knowledge will allow to achieve the intrinsic limit of dielectric properties of materials with low-loss microwaves, millimeter-waves, and submillimeter-waves.

Optimised pyroelectric elements on Si wafers for sensing and energy harvesting Call name:
2016 - 2019

Role in this project: Project coordinator

Coordinating institution: INSTITUTUL NATIONAL DE CERCETARE - DEZVOLTARE PENTRU FIZICA MATERIALELOR BUCURESTI RA

Project partners: INSTITUTUL NATIONAL DE CERCETARE - DEZVOLTARE PENTRU FIZICA MATERIALELOR BUCURESTI RA (RO)

Affiliation: INSTITUTUL NATIONAL DE CERCETARE - DEZVOLTARE PENTRU FIZICA MATERIALELOR BUCURESTI RA (RO)

Project website:

Abstract:

Pyroelectricity and pyroelectric effect are useful for a variety of high-tech applications including thermal imaging (e.g. for medicine, space, security or energy saving) or energy harvesting from devices producing heat variations (e.g. microprocessors). Pyroelectric properties of thin films are important in the frame of miniaturization trends And integration with Si technology.

Considering the above general presentation, the main objective of the project is to optimize the pyroelectric properties of the PZT thin films deposited on buffered Si wafers.

Suspended pyroelectric elements will be manufactured at the end, capitalizing on the knowledge gained on the quality of the contacts and the best composition/growth procedure that leads to maximum pyroelectric response. Pixel like detectors will be manufactured by integrating the active element with the impedance converter (a field effect transistor or an operational amplifier).

The present project builds on a long standing and fruitful collaboration between the leaders of the two teams, materialized in 2 previous IFA-CEA projects and a M-ERA NET project just started. Several common articles were published during the last 10 years.

The project teams have the necessary expertise to achieve the objectives. The infrastructure for the project is state-of-the art. The project has a significant potential for technological innovation if one refer to the suggested methods for optimization of the pyroelectric response or for the manufacturing of the active pyroelectric element.

Novel generation of pyroelectric detectors based on polar semiconductors Call name: P 3 - SP 3.2 - Proiecte ERA.NET
ERA-M-NOPYDET 2015 - 2018

Role in this project:

Coordinating institution: INSTITUTUL NATIONAL DE CERCETARE - DEZVOLTARE PENTRU FIZICA MATERIALELOR BUCURESTI RA

Project partners: INSTITUTUL NATIONAL DE CERCETARE - DEZVOLTARE PENTRU FIZICA MATERIALELOR BUCURESTI RA (RO); MICROELECTRONICA SA (RO)

Affiliation: INSTITUTUL NATIONAL DE CERCETARE - DEZVOLTARE PENTRU FIZICA MATERIALELOR BUCURESTI RA (RO)

Project website:

Abstract:

The project is proposing to develop a new generation of pyroelectric detectors based on wide gap polar semiconductor materials (e.g. AlN, ZnO) able to withstand high operating temperatures. The innovative aspects will go further beyond the state of the art by proposing multilayer structures based on nitrides (AlN, GaN, etc.) and ZnO-ferroelectric structures with the aim to enhance the sensitivity as much as possible at elevated temperatures. Specific innovative aspects can result also from packaging solutions, electronic for signal processing, etc. The detectors are primarily designated for internal combustion and jet engines used in automobile and airplane industries. The aim is to increase the lifetime of the engines, their safety and to optimize the fuel consumption with reduction of green house gases emissions. The expected impact is very high considering the share of the two industries at EU level and worldwide.

CHEMISTRY AND PHOTOCHEMISTRY ON FERROELECTRIC SURFACES Call name: Projects for Young Research Teams - RUTE -2014 call
PN-II-RU-TE-2014-4-0456 2015 - 2017

Role in this project: Key expert

Coordinating institution: INSTITUTUL NATIONAL DE CERCETARE - DEZVOLTARE PENTRU FIZICA MATERIALELOR BUCURESTI RA

Project partners: INSTITUTUL NATIONAL DE CERCETARE - DEZVOLTARE PENTRU FIZICA MATERIALELOR BUCURESTI RA (RO)

Affiliation: INSTITUTUL NATIONAL DE CERCETARE - DEZVOLTARE PENTRU FIZICA MATERIALELOR BUCURESTI RA (RO)

Project website: http://www.infim.ro/ro/projects/chimie-si-fotochimie-la-suprafete-feroelectrice

Abstract:

This Project is concentrated on a detailed study of the intimate processes occurring when molecules are adsorbed, desorbed or are reacting at atomically clean, well characterized, single crystal ferroelectric surfaces synthesized by pulsed laser deposition (PLD). In situ investigations will be carried out by a multitude of surface science techniques: X-ray photoelectron spectroscopy, X-ray photoelectron diffraction, low energy and reflection high energy electron diffraction (LEED and RHEED), mass spectroscopy, aiming to seek adsorptions, desorptions and molecular reactions when the ferroelectric polarization is triggered by external parameters (optically, thermally or by charge carrier injection). The goal of this project will be a detailed description of the molecular processes occurring at ferroelectric surfaces (lead zirco-titanate and barium titanate, also combined with noble metals as co-catalysts – Ag, Au, Pt, Pd), mainly involving molecular reactions of actual interest for automotive industry: (i) oxidation of carbon monoxide; (ii) reduction of nitric or nitrous oxide (NOx); (iii) combined reaction pathways for three way catalysts. The results of the Project will be helpful for the development of new catalytic converters, cheaper, operating at lower temperatures and whose activity may be triggered optically or electrically. The main output will consist in scientific papers in top tier ISI journals and possibly a patent application towards the end of the Project.

Optimized pyroelectric materials through the polarization gradient concept and experimental model for a pyroelectric detector with potential for applications in monitoring high power/energy lasers. Call name: Joint Applied Research Projects - PCCA 2013 - call
PN-II-PT-PCCA-2013-4-0470 2014 - 2017

Role in this project:

Coordinating institution: INSTITUTUL NATIONAL DE CERCETARE - DEZVOLTARE PENTRU FIZICA MATERIALELOR BUCURESTI RA

Project partners: INSTITUTUL NATIONAL DE CERCETARE - DEZVOLTARE PENTRU FIZICA MATERIALELOR BUCURESTI RA (RO); UNIVERSITATEA POLITEHNICA DIN BUCURESTI (RO); INTERNET S.R.L. (RO)

Affiliation: INSTITUTUL NATIONAL DE CERCETARE - DEZVOLTARE PENTRU FIZICA MATERIALELOR BUCURESTI RA (RO)

Project website: http://www.infim.ro/projects/optimized-pyroelectric-materials-through-polarization-gradient-concept-and-experimental

Abstract:

The project aims to develop materials with optimized pyroelectric properties using the polarization gradient concept and develop integral pyroelectric detectors for the near infrared (700 nm) to THz (≤100 µm) wavelengths range. These detectors have potential application also in the detection of high power or high energy laser beams (e.g. the lasers of ELI-NP project). The materials to be used in this project are ferroelectrics with a perovskite structure such as Pb(Zr,Ti)O3 (PZT) or (Ba,Sr)TiO3 (BST) due to the fact that the transition temperatures can be modified by changing the Zr or Sr content. These materials will be combined in structures of multilayers with gradient in concentration and polarization in order to increase the figure of merit M given by the ratio between the pyroelectric coefficient p and the dielectric constant ε (M=p/ε).

The present project proposes a novel way of increasing the merit figure M by increasing the pyroelectric coefficient. This can be achieved by developing materials that exhibit a concentration gradient in the direction of the polarization, which introduces a succession of phase transitions at different temperatures, leading to a more abrupt variation of the polarization with the temperature and thus to a larger pyroelectric coefficient.

Another effect to turn to account is the temperature variation of the dielectric constant which can contribute to further increase the total pyroelectric coefficient. The temperature variation of ε can contribute to the pyroelectric signal if an electric field is applied to the ferroelectric material in order to maintain a stable polarization state, thus averting possible signal variations caused by the ambient temperature conditions.

The materials with gradient in concentration and polarization will be realized in bulk form, as ceramic wafers (25 mm minimum diameter and 6 mm thickness) by using the spark plasma sintering (SPS). Alternately, the ceramic technology coupled with classical sintering, or hot press, can be used. The sintering conditions will be optimized in order to obtain the best p/ε ratio. The selected material will then be used to build the active elements for the pyroelectric detection. In this respect, metallic electrodes will be deposited and one of them will be blackened in order to ensure a better absorbtion of the incident electromagnetic radiation. A novel approach is that carbon nanotubes are to be used for the blackening. This way the absorbtion coeficient can be increased close to 1. The active element will then be used to create pyroelectric detectors, including the electronics for signal processing and the sofware needed for PC display. Beside the mentioned ceramic materials, epitaxial multilayered structures with gradient in concentration and polarization will be realized and their pyroelectric detection properties will be investigated as well during the project.

The consortium is formed by 3 partners: coordinator of the project –CO is a national institute with experience in ceramic materials and pyroelectric detection; one university –P1 with experience in preparation of ceramic powders; one company –P2 specialized in signal procesing and different types of electrical measurements. CO and P1 will develop the active element for the pyroelectric detection and P2 will develop and test the experimental model of the system for pyroelectric detection including all the electronics and the sofware needed for the different types of applications for which the pyroelectric detector is developed by CO and P2: automatizations, non-contact measurements of temperature or monitoring of the high power/energy laser beams. The ultimate goals are to obtain: a technological process for obtaining the active element of pyroelectric detection, as well as two experimental models, one for the Pyroelectric Detector and one for a Pyroelectric Detection System used to detect high intensity laser beams.

Investigations on advanced dielectric materials and structures in Terahertz and millimeter waves Call name: Exploratory Research Projects - PCE-2012 call
PN-II-ID-PCE-2012-4-0654 2013 - 2016

Role in this project:

Coordinating institution: INSTITUTUL NATIONAL DE CERCETARE - DEZVOLTARE PENTRU FIZICA MATERIALELOR BUCURESTI RA

Project partners: INSTITUTUL NATIONAL DE CERCETARE - DEZVOLTARE PENTRU FIZICA MATERIALELOR BUCURESTI RA (RO)

Affiliation: INSTITUTUL NATIONAL DE CERCETARE - DEZVOLTARE PENTRU FIZICA MATERIALELOR BUCURESTI RA (RO)

Project website: http://www.infim.ro/node/4190

Abstract:

At the present, terahertz technology is certainly one of the most dynamic research fields with wide variety of applications: terabit wireless communication, spectroscopy, biology, medical sciences, food control, security systems, etc. The project aims to investigate advanced conventional as well as structured materials in Terahertz and millimeter wave range. On one hand, highly accurate characterization methods of complex perovskite dielectrics (bulk and thin films) with high values of the product between the quality factor and the frequency will be developed for millimeter wave and Terahertz range. The application of development methods to measure ferroelectric perovskites in Terahertz range is very important for such applications as tunable photonic crystal filters. On the other hand, numerical and experimental investigations on structured materials will allow the study of the Terahertz spoof surface plasmon-polaritons in new complex geometries. The electromagnetic simulation, fabrication and characterization of the proposed materials and structures will benefit of recent acquisitioned state-of-the-art equipment in the host institution. The final outcome of the project will consist in solution for an improved controlled of the electromagnetic radiation in millimeter wave and Terahertz range.

Atomically resolved structure and interface related phenomena in nano-scale modulated smart materials Call name: Exploratory Research Projects - PCE-2012 call
PN-II-ID-PCE-2012-4-0362 2013 - 2016

Role in this project:

Coordinating institution: INSTITUTUL NATIONAL DE CERCETARE - DEZVOLTARE PENTRU FIZICA MATERIALELOR BUCURESTI RA

Project partners: INSTITUTUL NATIONAL DE CERCETARE - DEZVOLTARE PENTRU FIZICA MATERIALELOR BUCURESTI RA (RO)

Affiliation: INSTITUTUL NATIONAL DE CERCETARE - DEZVOLTARE PENTRU FIZICA MATERIALELOR BUCURESTI RA (RO)

Project website: http://www.infim.ro/projects/atomically-resolved-structure-and-interface-related-phenomena-nano-scale-modulated-smart

Abstract:

Physical properties of advanced materials like artificial multiferroics, multilayered structures of semiconductors, shape memory alloys (SMA) result from the interaction between the micro- or nano-scale components (crystal grains, thin films), involving interface processes. The importance of the interface phenomena and of the associated structural defects increases with the size reduction of the involved crystal grains or thin layers. Getting accurate structural information at and near the interface between the nanoscaled components (atomic structure of the interface, associated extended defects, strain fields) becomes mandatory in understanding and designing the physical properties of new materials. Advanced techniques of analytical electron microscopy along with consecrated structural and thermal analysis techniques using state-of-the-art equipments will be mainly employed for thorough microstructural investigations on two classes of materials for which interface phenomena play a crucial role: i. artificial multiferroics and ii. shape memory alloys.

The project specific objectives are:

1. Atomic structure of interfaces and structural defects in artificial multiferroics.

2. Strain field and composition mapping at atomic scale around interfaces and structural defects in artificial multiferroics.

3. Correlation between structural phase transitions and strain fields in nanoscale modulated SMAs.

4. Atomically resolved crystal structure in nanoscale modulated SMAs.

Effect of interfaces on charge transport in ferroic/multiferroic heterostructures Call name: Complex Exploratory Research Projects - PCCE-2011 call
PN-II-ID-PCCE-2011-2-0006 2012 - 2016

Role in this project:

Coordinating institution: National Institute of Materials Physics

Project partners: National Institute of Materials Physics (RO); National Institute of Materials Physics (RO); National Institute of Materials Physics (RO); National Institute of Materials Physics (RO); National Institute of Materials Physics (RO); Alexandru Ioan Cuza University (RO)

Affiliation: National Institute of Materials Physics (RO)

Project website: http://www.infim.ro/projects/effect-interfaces-charge-transport-ferroelectricmultiferroic-heterostructures

Abstract:

The main objective of the project is to perform a detailed study of interfaces and their effect on the charge transport properties in a number of well defined artificial multiferroic structures. Charge transport is beneficial in some cases, for example in tunnel junctions, but can be detrimental in other cases, as for example devices based on magnetoelectric effect or in capacitor like structures. In all cases, at least the interfaces with the metallic electrodes are involved in charge transport, but other interfaces can be also involved if multilayer structures are used. The study will be performed on thin films and/or nanostructures, therefore a significant influence of interfaces on the electronic and ionic charge transport is expected. The start will be from simple capacitor-like structures, to elucidate the problem of electrode interfaces in the case of various ferroic oxides. Further on charge transport in relation with interfaces will be studied in mode complex, multilayer structures with possible applications in tunel junctions, diodes or field effect devices.

The project involves 6 research teams from 2 host institutions, one of which is the National Institute of Materials Physics from Bucharest-Magurele, and the other one is the Alexandru Ioan Cuza University (UAIC) from Iassy. The composition of the teams is a mixes experienced researchers with excellent track records regarding preparation, characterization and modelling of advanced multifunctional materials including oxides, and young scientists at the beginning of their carriers. Some 12 PhD thesis are expected to start during the project. The project is expected to have a major impact not only at the basic science level, reflected by publications in high ranking journals, but also at the level of applied research, as for example manipulation of charge transport through designing specific interfaces or developement of new oxide architectures for ferroelectric field effect controlled of spin currents.

Study of Induced Effects by Defects and Impurities on Optical, Electrical and Electronic Properties of Wide Band Gap Semiconductors Call name: Projects for Young Research Teams - TE-2011 call
PN-II-RU-TE-2011-3-0016 2011 - 2014

Role in this project:

Coordinating institution: Institutul National de Cercetare-Dezvoltare pentru Fizica Materialelor

Project partners: Institutul National de Cercetare-Dezvoltare pentru Fizica Materialelor (RO)

Affiliation:

Project website: http://www.infim.ro/projects/study-induced-effects-defects-and-impurities-optical-electrical-and-electronic-properties

Abstract:

The aim of this project is the analysis of wide band gap semiconductor (WBS) thin films by use of non-destructive characterization techniques: ellipsometry, XRD and luminescence. These materials have existing or potential applications in optics and/or electronics. WBS thin films will be obtained by use of different thin films growth methods: pulsed laser deposition, magnetron sputtering, sol-gel and direct growth from colloidal suspension. The influence of defects and impurities on optical, electrical and electronic properties of such materials will be analyzed. The results from presented optical studies will be verified by conventional electrical measurements and structural analysis by electronic microscopy.

The project is focused on 3 types of wide band gap semiconductors: zinc oxide (ZnO) pure or doped with different elements; zinc nitride (Zn3N2) and the intermediary phases during controlled oxidation; and aluminum indium nitride (AlxIn1-xN) pure and doped with Zn. One objective is to grow and to characterize the n-type semiconductors with reproducible properties.

The estimated results will bring new insights regarding the physics phenomena involved in the growth process and the material properties, essential for obtaining viable results. In addition, special activities will be included in the project concerning the correlation between the fundamental knowledge and practical necessities of electronics, and the standardization of the growth of thin films below 200C.

Surface and Interface Science: Physics, chemistry, biology, applications. Call name: Complex Exploratory Research Projects - PCCE-2008 call
PN-II-ID-PCCE-2008-0076 2010 - 2013

Role in this project:

Coordinating institution: INSATITUTUL NATIONAL DE CERCETARE DEZVOLTARE PENTRU FIZICA MATERIALELOR

Project partners: INSATITUTUL NATIONAL DE CERCETARE DEZVOLTARE PENTRU FIZICA MATERIALELOR (RO); INSTITUTUL NATIONAL DE CERCETARE DEZVOLTARE PENTRU INGINERIE ELECTRICA (RO); UNIVERSITATEA DE MEDICINA SI FARMACIE CAROL DAVILA DIN BUCURESTI (RO); UNIVERSITATEA ALEXANDRU IOAN CUZA DIN IASI (RO); INSTITUTUL NATIONAL DE CERCETARE DEZVOLTARE PENTRU FIZICA TEHNICA DIN IASI (RO); INSTITUTUL NATIONAL DE CERCETARE DEZVOLTARE PENTRU TEHNOLOGII IZOTOPICE SI MOLECULARE DIN CLUJ-NAPOCA (RO); UNIVERSITATEA BABES-BOLYAI DIN CLUJ-NAPOCA (RO); ACADEMIA ROMANA FILIALA TIMISOARA (RO); UNIVERSITATEA DE MEDICINA SI FARMACIE VICTOR BABES TIMISOARA (RO)

Affiliation: INSATITUTUL NATIONAL DE CERCETARE DEZVOLTARE PENTRU FIZICA MATERIALELOR (RO)

Project website: http://www.infim.ro/projects/siinta-suprafetelor-si-interfetelor-fizica-chimie-biologie-aplicatii

Abstract:

This project intends to provide a financial background for developing the community of Surface Science in Romania. Thematics from physics and chemistry of surfaces will be tackled together with applications of surface science in biology and in technology; also new standards will be proposed for consistent data interpretation. The Project clusterizes the most important Romanian teams with preoccupations in surface science, namely all X-ray photoelectron spectroscopy teams with most of the community of thin film deposition, cluster and nanoparticle physics, surface reactivity, surface chemistry and photochemistry, multilayer physics and applications, magnetic fluids, functionalization of surfaces, cell attachment, studies of cellular membrane. The research teams belong to highly prominent Universities and Research Institutes from practically all geographical areas of the country. The Consortium disposes of infrastructure exceeding 10 million euros, of more than one hundreed highly qualified scientists which have generated during the past years more than 3 % of the national scientific visibility. The research will concentrate into four main areas: (i) magnetic properties of surfaces and low-dimensional systems; (ii) electrical properties of surfaces and heterostructures; (iii) surface chemistry; (iv) application of surface science in functionalized systems and in biology, together with (v) an area concentrating on standardization in X-ray photoelectron spectroscopy, Auger electron spectroscopy and related techniques. Each area is divided into several thematics; each thematic has at least one in-charge scientist. This Project will foster the surface science community in Romania and will contribute strongly to the development of high-technological industrial preoccupation in all geographical areas concerned. Several cutting-edge applications are also foreseen by pursuing the fundamental research proposed.

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List of research grants as project coordinator	Download (19.8 kb) 22/09/2017
List of research grants as partner team leader
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Significant R&D projects for enterprises, as project manager
R&D activities in enterprises
Peer-review activity for international programs/projects