Browsing by Author "Vatavu, Sergiu"

THE ANALYSIS OF CURRENT FLOW MECHANISM IN CDS/CDTE HETEROJUNCTION

Vatavu, Sergiu; Gașin, Petru (Elsevier, 2007)

An analysis of current–voltage dependencies of CdS/CdTe heterojunction in the 78–370 K temperature range has been carried out. According to this analysis the current flow mechanism is determined by the tunneling processes ...

CdTe FILMS BY ELEMENTAL VAPOR TRANSPORT

Kendre, V.; Evani, V.; Khan, M.; Palekis, V.; Vatavu, Sergiu; Morel, D.; Ferekides, C. (IEEE, 2013)

The electro-optical properties of CdTe films deposited by Elemental Vapor Transport (EVT) are being investigated. The EVT process, unlike most processes currently used for the deposition of CdTe thin films, allows for the ...

THE COPPER INFLUENCE ON THE PL SPECTRA OF CDTE THIN FILM AS A COMPONENT OF THE CDS/CDTE HETEROJUNCTION

Vatavu, Sergiu; Zhao, Hehong; Caraman, Iuliana; Gașin, Petru; Ferekides, Chris (Elsevier, 2009)

The influence of annealing in the presence of CdCl2 and a thin copper layer deposited onto CdTe on the photoluminescence spectra of CdTe, as a component of CdS/CdTe heterojunction, has been studied for two excitation ...

CuInSe2 NANOSTRUCTURES PREPARED BY CHEMICAL CLOSE-SPACED VAPOR TRANSPORT FOR HYBRID PHOTOVOLTAIC DEVICES

Vatavu, Sergiu; von Morze, N.; Wiesner, S.; Moras, S.; Hinrichs, V.; Gasiorowski, J.; Zahn, D.R.T.; Lux-Steiner, Lux-Steiner; Rusu, M. (Elsevier, 2017)

This work focuses on the fabrication of stoichiometric CuInSe2 nanostructures with controllable physical parameters of the nanocrystals suitable for hybrid organic/inorganic photovoltaics. CuInSe2 nanostructures were ...

DISPOZITIVE DIN FOSFURĂ DE INDIU BAZATE PE EFECTUL FOTOVOLTAIC

Botnariuc, Vasile; Gorceac, Leonid; Coval, Andrei; Vatavu, Sergiu; Cinic, Boris; Rotaru, Corneliu; Raevschi, Simion (CEP USM, 2021)

Homo- și heterojoncțiunile din p - InP și n - CdS au fost confecționate aplicând metoda epitaxiei din faza gazoasă în volum deschis, în sistem de cloruri, metoda HVPE (Hydride Vapour Phase Epitaxy) și tehnologia în volum ...

THE EFFECT OF Cu AND ANNEALING TREATMENTS ON CdS/CdTe HETEROSTRUCTURES STUDIED WITH QE AND PHOTOCURRENT RELAXATION TECHNIQUES

Zhao, H.; Vatavu, Sergiu; Caraman, Iu. M.; Gasin, P. A.; Morel, D. L.; Ferekides, C. S. (IEEE, 2008)

The photo-emf (photocurrent) decay al light impulses excitation (in longitudinal configuration) has been used to determine the lifetime of the non-equilibrium charge carriers recombining in different regions of the CdS/CdTe ...

FOTODETECTOR PE HETEROJONCȚIUNE DIN FOSFURĂ DE INDIU

Gorceac, Leonid; Botnariuc, Vasile; Coval, Andrei; Vatavu, Sergiu; Cinic, Boris; Raevschi, Simion; Rotaru, Corneliu (CEP USM, 2020)

THE INVESTIGATION OF TCO/CdS/CdTe HETEROJUNCTIONS BY C-U and C-f MEASUREMENTS: EXPERIMENT AND MODELING

Rotaru, Corneliu; Vatavu, Sergiu; Fedorov, Vladimir; Gașin, Petru; Lux-Steiner, Martha; Ferekides, Chris; Rusu, Marin (IEEE, 2013)

The paper presents the analysis of C-U and C-f data obtained in the 1 kHz-10 MHz range for CdS/CdTe heterojunctions prepared by CSS onto (ZnO:Al, ZnO:Al/i-ZnO)/Glass substrates. An attempt to model the physical properties ...

KINETICS OF PHOTOCONDUCTIVITY AND PHOTOLUMINESCENCE OF CdS/CdTe HETEROJUNCTIONS

Vatavu, Sergiu; Caraman, Iuliana; Gasin, Petru (2005)

The photoluminescence and absoption spectral distribution close to the edge of fundamental band were studied in the CdS and CdTe films components of the CdS/CdTe heterojunctions. Recombination level energetic position ...

METALORGANIC AEROSOL DEPOSITION TECHNIQUE

Şapoval, Oleg; Belenciuc, Alexandr; Vatavu, Sergiu (CEP USM, 2022-11-10)

METALORGANIC AEROSOL DEPOSITION: THE BUILDING OF OXIDE FILMS

Şapoval, Oleg; Belenciuc, Alexandr; Vatavu, Sergiu (CEP USM, 2022-11-10)

NEGATIVE DIFFERENTIAL RESISTANCE IN ZnO-BASED RESONANT TUNNELING DIODES

Sirkeli, Vadim; Vatavu, Sergiu; Yilmazoglu, Oktay; Preu, Sascha; Hartnagel, Hans (IEEE, 2019)

We present the results of a simulation study of resonant tunneling transport of non-polar m-plane ZnO/ZnMgO quantum structures with double and triple quantum barriers. It is found that in current density-voltage characteristics ...

PARTICULARITĂȚI STRUCTURALE ALE FILMELOR ZnSnN2

Ghilețchii, Gheorghe; Narolschi, Igor; Rotaru, Corneliu; Rusu, Marin; Vatavu, Sergiu (CEP USM, 2024)

ZnSnN2 is composed of common non-toxic elements. It exhibits promising optoelectronic properties for application in photoelectric conversion and electromagnetic radiation detection devices. However, the available ...

PHOTOLUMINESENCE STUDIES OF CDTE/SNO2 AND CDTE/CDS HETEROJUNCTIONS: THE INFLUENCE OF OXYGEN AND THE CDCL2 HEAT TREATMENT

Vatavu, Sergiu; Zhao, Hehong; Caraman, Iuliana; Gasin, Petru; Ferekides, Chris (Elsevier, 2011)

The influence of oxygen and annealing in the presence of CdCl2 on the photoluminescence (PL) spectra of CdTe, component of SnO2/CdTe heterojunction (HJ), has been studied in a temperature range of 17–100 K. The changes in ...

PROPRIETĂȚILE FIZICE ALE STRATURILOR DE ZnO PREPARATE PE Si PRIN METODA HIDROTERMALĂ

Raevschi, Simion; Gorceac, Leonid; Botnariuc, Vasile; Braniște, Tudor; Vatavu, Sergiu (CEP USM, 2020)

Straturi subțiri, de nucleație și proprii, de ZnO au fost sintetizate pe Si prin metoda hidrotermală din soluțiile compușilor zincului folosindu-se solvenții: apă, apă + etanol, apă + metanol, apă + propanol, apă + ...

RADIATIVE RECOMBINATION MECHANISMS IN CDTE THIN FILMS DEPOSITED BY ELEMENTAL VAPOR TRANSPORT

Collins, Shamara; Vatavu, Sergiu; Evani, Vamsi; Khan, Md; Bakhsh, Sara; Palekis, Vasilios; Rotaru, Corneliu; Ferekides, Chris (Elsevier, 2015)

A photoluminesence (PL) study of the radiative recombination mechanisms for CdTe films deposited under different Cd and Te overpressure by elemental vapor transport is presented. The experiment and analysis have been carried ...

STOICHIOMETRIC EFFECTS IN POLYCRYSTALLINE CDTE

Khan, M.; Evani, V.; Collins, S.; Palekis, V.; Bane, P.; Bakhshi, S.; Kendre, V.; Vatavu, Sergiu; Morel, D.; Ferekides, C. (IEEE, 2014)

The effect of the vapor phase Cadmium (Cd) to Tellurium (Te) ratio on the electronic properties of CdTe films is being studied. The stoichiometry of CdTe films is being altered by varying the gas phase Cd/Te ratio during ...

STRATURI SUBȚIRI Ga2S3 PENTRU APLICAȚII ÎN DETECTORI DE RADIAȚII ELECTROMAGNETICE

Spoială, Dorin; Ghilețchii, Gheorghe; Vatavu, Elmira; Dmitroglo, Liliana; Şapoval, Oleg; Belenciuc, Alexandr; Rotaru, Corneliu; Narolschi, Igor; Vatavu, Sergiu (CEP USM, 2022-11-10)

STRATURI SUBȚIRI SEMICONDUCTOARE PREPARATE ÎN SISTEME DE PULVERIZARE CU MAGNETRON (DC): TEORIE vs EXPERIMENT (I)

Narolschi, Igor; Cliucanov, Alexandr; Rotaru, Corneliu; Rusu, Marin; Vatavu, Sergiu (CEP USM, 2020)

Caracteristica curent-tensiune a sistemului de pulverizare cu magnetron(DC) depinde în formă pătratică de trei parametri,unul dintre care este egal cu potențialul de aprindere a descărcării gazului, pe când ceilalți doi ...

STRUCTURA ȘI MORFOLOGIA STRATURILOR NANOMETRICE DE ZnSnN2 PREPARATE PRIN MAGNETRON SPUTTERING

Narolschi, Igor; Ghilețchii, Gheorghe; Cliucanov, Alexandr; Rotaru, Corneliu; Spoială, Dorin; Vatavu, Elmira; Şapoval, Oleg; Belenciuc, Alexandr; Dmitroglo, Liliana; Bercu, Elena; Rusu, Marin; Vatavu, Sergiu (CEP USM, 2022-11-10)

Browsing by Author "Vatavu, Sergiu"

Browsing by Author "Vatavu, Sergiu"

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