BrainMap

Mr. George-Adrian Lungu

Dr.

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

Other affiliations

Invited Researcher (Jan 2005 - May 2006) - Istituto Nazionale di Fisica Nucleare (INFN), Sezione di Pisa (Italy)

Researcher

I work as researcher in National Institute of Materials Physics (NIMP) since 2002, with a 1.5 years stage in 2005-2006 at italian National Institute of Nuclear Physics in Pisa, where I did participate for construction of Tracker Inner Disks and Barrel of the Compact Muon Solenoid, now operating at Large Hadron Collider in Geneva, Switzerland. Within NIMP I work in the Laboratory of Surface and Interface Science, where I am also radiation protection officer for the positron annihilation-induced Auger electron spectroscopy setup. I graduated the PhD in physics with a diploma in thin films magnetism. I am specialized in electron spectroscopy and x-ray absorption spectroscopy, and coauthor for 47 scientific articles and 1 scientific book chapter.

Web of Science ResearcherID: I-8729-2012

Curriculum Vitae (04/07/2023)

Expertise & keywords

Synaptic neuron-like structure based on HfO2/GeSn with ferroelectric field effect that simulates a three-terminal memristor Call name: P 1 - SP 1.1 - Proiecte de cercetare pentru stimularea tinerelor echipe independente - TE-2021
PN-III-P1-1.1-TE-2021-1537 2022 - 2024

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: https://infim.ro/en/project/synaptic-neuron-like-structure-based-on-hfo2-gesn-with-ferroelectric-field-effect-that-simulates-a-three-terminal-memristor/

Abstract:

This project propose the development of a synaptic structure based on HfOx/GexSn1-x with conductance modulated by ferroelectric field-effect. By improving the ferroelectric characteristics of HfOx using a high-mobility channel material (epi/poly GeSn) we obtain a synaptic neuron-like structure that simulate a three-terminal memristor for neuromorphic computing. The HfOx/GexSn1-x structure is obtained by reactive/non-reactive magnetron sputtering followed by Rapid Thermal Annealing in active working gas (H2/N2) to avoid the local disorder by passivating the dangling bonds and by healing the trap states. The remanent polarization will be enhanced for HfOx/GexSn1-x structure by controlling the interface between HfOx FeCAP and the GeSn high-mobility channel. The HfOx/GexSn1-x layers structure is morphological and structural characterized by XRD, XPS, HRTEM, and electrical measurements of the ferroelectric field-effect.

Molecular adsorption and reactions under two-dimensional shells Call name: P 1 - SP 1.1 - Proiecte de cercetare pentru stimularea tinerelor echipe independente
PN-III-P1-1.1-TE-2019-0916 2021 - 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)

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

Project website: https://infim.ro/en/project/molecular-adsorption-and-reactions-under-two-dimensional-shells/

Abstract:

This project intends to study carbon monoxide (CO) intercalation and reactions involving CO (insertion, oxidation and desorption) with the aim to synthesize hydrogen or alkanes (Fischer-Tropsch reaction) at the graphene (Gr)/Pt(001) surface, using high resolution XPS, NEXAFS, LEED, STM and TPD. The main reasons to investigate this surface are the fact that it was shown that Gr on Pt(111) is one of the weakest Gr-metal bonds – and due to the incommensurate character of the Pt(001) with respect to the Gr structure, one expects that Gr on Pt(001) will be even weaker – and the rich hex reconstruction of Pt(001), which could provide enhanced affinity for CO to adsorb with respect to the more compact no-superstructure Pt(111) surface.

This study will provide fundamental insight and the possibility to determine insertion sites and reaction pathways together with relevant parameters such as adsorption energy, energy barrier for reaction, and turnover frequency for these processes. Moreover, it will constitute a significant step in the technological advance towards using ultrathin carbon layers deposited on Pt films industrially, for applications involving CO depletion and/or conversion.

Broadband photodetector based on hydrogenated GeSn layers. Call name: P 2 - SP 2.1 - Proiect experimental - demonstrativ
PN-III-P2-2.1-PED-2019-4468 2020 - 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)

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

Project website: http://infim.ro/en/project/broadband-photodetector-based-on-hydrogenated-gesn-layers/

Abstract:

The main goal of this project is the obtaining by magnetron sputtering (MS) deposition and hydrogenation of GexSn1-x:H alloy, a new photosensitive material for fabrication of high sensitive broadband photodetectors. By increasing the Sn concentration in GeSn alloy, the bandgap is narrowed and changed from indirect to direct bandgap semiconductor, making GeSn a good candidate for photodetectors with extended sensitivity to short-wave infrared range (SWIR). At international level, the hydrogenation of GexSn1-x to obtained amorphous and nanocrystalline GexSn1-x:H represents the novelty of the project proposal. The role of hydrogen in GexSn1-x:H alloy is to passivate the structural unintended defects, in order to increase the photosensitivity. This is similar to other semiconductors based on group IV of elements (a-Si:H and a-SiGe:H) intensively studied and reported in literature. Two different technological routes of obtaining GexSn1-x:H will be investigated: i) MS deposition of GexSn1-x films with various Sn content followed by hydrogen plasma treatment at different annealing temperatures; ii) direct deposition of GexSn1-x:H by reactive MS in atmosphere of hydrogen diluted in argon. In both cases, the nanocrystallization will be obtained by in-situ annealing during MS deposition or ex-situ by RTA treatment. For achieving the final goal that of obtaining a broadband photodetector with high sensitivity in SWIR, complex characterizations of GexSn1-x:H layers will be performed to find out the optimal technological parameters of the demonstrator. The demonstrator will be functionally tested in the lab according to TRL3. Such photodetectors with high sensitivity in SWIR are imperatively desired to replace the actual market devices based on toxic materials PbS and InGaAs. The results of the project activities may serve to future research on GexSn1-x:H for other practical applications as for example tandem a-SiGeSn:H solar cells.

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: 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 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.

A general methodology for bio-polymers precursors synthesis: Mono- and di- aromatic carboxylic acids by catalytic routes Call name: P 2 - SP 2.1 - Proiect experimental - demonstrativ
PN-III-P2-2.1-PED-2016-1429 2017 - 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)

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

Project website: http://www.infim.ro/ro/projects/o-metodologie-generala-de-sinteza-precursorilor-de-bio-polimeri-cai-catalitice-de-obtinere

Abstract:

Development of new products and advancement in biopolymers technology for to meet and stand up the develop countries regulations is necessary to a competitive production units in Europe. Therefore, the main objective of BIOPREC concerns the development of an efficient catalytic material to be generally applied for the synthesis of mono- and di- aromatic carboxylic acids (as precursors for bio-polymers). The BIOPREC concept takes into account two main conditions: the methodology for aromatic carboxylic acid synthesis is an oxidation reaction and the precursors for oxidation are based on renewable resources.

High temperature, high stability, low cost evaporation cells for molecular beam epitaxy Call name: Joint Applied Research Projects - PCCA-2011 call, Type 2
PN-II-PT-PCCA-2011-3.2-0767 2012 - 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); INSTITUTUL NATIONAL DE CERCETARE DEZVOLTARE PENTRU TEHNOLOGII IZOTOPICE SI MOLECULARE I N C D T I M (RO); BRAVA 2000 S.R.L. (RO)

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

Project website: http://www.infim.ro/projects/celule-de-evaporare-la-temperaturi-mari-stabilitate-ridicata-si-cost-redus-pentru-depuneri

Abstract:

Evaporation cells based on a new heating principle will be designed, fabricated and tested. This heating principle is based on direct resistive heating of two concentric tubes made on a refractory metal (Ta, Mo, W), with thin walls (0.1-0.2 mm), subject to a high electrical current (60-100 A). The inner pipe contains the material to be evaporated. The outer pipe, which also warms up, acts at the same time as a thermal screen for the inner pipe: as a consequence, higher temperatures are achieved in the inner part and also a higher amount of power is dissipated inside the inner pipe. The warming up to very high temperatures (over 2000 C) proceeds in a few tens of seconds, to be compared with several tens of minutes in standard evaporation cells where a crucible is warmed by using a W filament. Also, a precise temperature calibration may be obtained as function of the heating current only, whereas in conventional cells thermocouples are used. These thermocouples require additional vacuum current feedthroughs and also their thermal contact to the crucible may be problematic. A third advantage of the new principle is its relative low cost, based on the fact that the only expensive parts are the refractory material pipes. A new concept (dismountable assembly) will be developed also for the water cooling of the cell, whereas a single high current vacuum feedthrough is sufficient. One anticipates easy and fast manufacture of such devices, resulting in low delivery terms, as compared with 3-6 months for the actual evaporators. The estimated market is of some 500-1000 units in the European Community, whereas the stipulated benefit is of 5000 Euro per unit. The project will (i) implement the new heating principle; (ii) implement the new water cooling principle; (iii) achieve accuracte temperature calibration; (iv) demonstrate the ability to evaporate at high temperature, especially of metals that are usually evaporated by electron bombardment: Ti, Cr, V, Zr, Nb.

Ultrafast laser Facility with Optimized high order harmonics UltraViolet sources Call name: Joint Applied Research Projects - PCCA-2011 call, Type 1
PN-II-PT-PCCA-2011-3.1-0886 2012 - 2016

Role in this project:

Coordinating institution: INSTITUTUL NATIONAL DE CERCETARE DEZVOLTARE PENTRU FIZICA LASERILOR, PLASMEI SI RADIATIEI - INFLPR RA

Project partners: INSTITUTUL NATIONAL DE CERCETARE DEZVOLTARE PENTRU FIZICA LASERILOR, PLASMEI SI RADIATIEI - INFLPR 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); 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://ssll.inflpr.ro/ufouv/index.html

Abstract:

Nonlinear optics has revolutionized laser science by making it possible to efficiently convert laser light from one wavelength to another. Using the extreme nonlinear- optical process of high harmonic generation (HHG), light from an ultra-fast laser can be coherently up-shifted, resulting in a useful, tabletop, coherent and polarized short wavelength source. Such sources complement or replace expensive synchrotron facilities in specific applications.

The unique properties of UV HHG have already proven useful for studying ultra-fast molecular, plasma and materials dynamics, for characterizing nanoscale heat flow, for following element-specific dynamics in magnetic materials, and for high-resolution coherent imaging. HHG are ideal also for capturing the motion of electrons in atoms, molecules, and materials on their fundamental time (~fs) and length (~nm) scales.

Our project aims to develop at the TEWALAS laser system in INFLPR (15 TW, 10 Hz, 800 nm, 30 fs pulse duration), a HHG source technology as in [1] and also aims to build a facility to offer access to high flux radiation over the entire UV range. The major advantage is the ten fold increased UV production efficiency via quasi-phase matching control.

The expected impact of the development relates to a revolution in the efficiency of HHG sources, comparable with the one introduced by the periodically poled nonlinear crystals in laser physics. The optimized HHG sources will be patented and offered as high end products to the global ultra-fast laser market. The sources will also be the key elements at the core of a facility offering services related to the entire UV range, extending the capabilities of the TEWALAS laser facility. The commissioning of the UV user facility will be provided through a first experiment related to multi-coincidence photo-electron and photo-ion studies in diluted systems [2].

[1] Tosa V,et al., New J. of Phys. 10, 025016 (2008)

[2] C.M. Teodorescu, al., J. Chem. Phys. 109, 9280 (1998)

MACRO – STRESS AND MICRO – STRESS IN RIETVELD REFINEMENT: NEW MODELS AND APPROACHES Call name: Exploratory Research Projects - PCE-2011 call
PN-II-ID-PCE-2011-3-0082 2011 - 2016

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

Project website: http://www.infim.ro/projects/macro-stress-and-micro-stress-rietveld-refinement-new-models-and-approaches

Abstract:

The overall objective of the project is the development of new parameterized mathematical models appropriate for implementation in the whole pattern fitting codes, Rietveld codes included, of the X-ray and neutron diffraction histograms recorded on textured powder (polycrystalline) samples. The models describe the dependences of diffraction peak shifts and broadenings caused by macro and micro strains-stresses on the Miller indices and directions in sample and are based on the analysis of these quantities by generalized spherical harmonics. For the peak shift the spherical harmonics approach, to which the director of this project brought an important contribution providing an analytical representations appropriate for the Rietveld method, was developed only in the last decade. Being considered very attractive as being free of not-physical hypothesis needed for the classical approximations, this approach is still susceptible for significant improvements. These consists in searching for alternative analytical representations of the peak shift as perturbations of Voigt and Reuss ground states that could have faster convergences than those of hydrostatic ground state derived some time ago. For the peak broadening, the use of the spherical harmonics analysis will result into analytical expressions dependent also on the directions in sample, replacing the formulae Popa/Sthephens (1998/1999) dependent only on the Miller indices, used now in the most popular Rietveld codes.

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.

FILE DESCRIPTION	DOCUMENT
List of research grants as project coordinator or partner team leader
Significant R&D projects for enterprises, as project manager
R&D activities in enterprises
Peer-review activity for international programs/projects