Facultatea Electronică şi Telecomunicaţii: Recent submissions

Now showing items 941-960 of 1268

Effect of amorphous shell on transfer phenomena and optical properties of size-limited systems

SINYAVSKII, E.P.; SOKOVNICH, S.M. (Tehnica UTM, 2019)

In size-quantized systems (quantum wires, quantum dots), the effect of carrier scattering on surface roughness on kinetic phenomena is especially pronounced with small nanostructures. If a size-limited system is encased ...
Superimposed equally oriented diffraction gratings formed in As2S3 films

SERGEEV, S.A.; IOVU, M.S.; MESHALKIN, A.Yu. (Tehnica UTM, 2019)

The known chalcogenide amorphous films are suitable materials for formation of composite diffraction structures due to their optical properties and advanced registration parameters. To obtain the multi-beam light diffraction ...
The optical and energy parameters of As40Se60, As40Se30Te30, As40Se30S30 chalcogenide glasses

ISAYEV, A. I.; MEKHTIYEVA, S. I.; ALEKBEROV, R. I. (Tehnica UTM, 2019)

The chalcogenide vitreous semiconductors (CVS) are characterized by unique physical properties, has received special attention in connection with the broad forecast for using these materials in photolithography, holography, ...
The parameters local structure of As – Ge – Se chalcogenide glasses

ISAYEV, A. I.; MEKHTIYEVA, S. I.; MAMEDOVA, H. I. (Tehnica UTM, 2019)

The chalcogenide glass-like semiconductors (ChGS) out perform other functional materials in their unique electronic properties used for applications [1 -2]. They are transparent in wide spectral region, have high ...
Influence of the phase state of Ge2Sb2Te5 thin cover on the parameters of the optical waveguide structures

KOVALUYK, V.; LAZARENKO, P.; KOZYUKHIN, S.; AN, P.; PROKHODTSOV, A.; GOLTSMAN, G.; SHERCHENKOV, A. (Tehnica UTM, 2019)

The fast switching time of Ge-Sb-Te thin films between amorphous and crystalline states initiated by laser beam as well as significant change of their optical properties and the preservation of metastable states for tens ...
Electrical and dielectric properties of glass system Sb2O3-PbCl2-AgCl

BOSAK, O.; KOSTKA, P.; LE COQ, D.; MINARIK, S.; KUBLIHA, M. (Tehnica UTM, 2019)

The glass system (Sb2O3)-(PbCl2)-(AgCl) is interesting due to his potential application in the infrared part of the electromagnetic spectrum [1]. The (Sb2O3)y(PbCl2)y-x(AgCl)x glasses, with y = 50 mol. % or 70 mol. %, ...
Artificial neural network analysis of thermally stimulated depolarisation currents in Sb2O3-WO3-Li2O-Na2O glasses

BOSAK, O.; MAACHE, D.; SOLTANI, M. T.; KOSTKA, P.; LABAS, V.; KEBISEK, M.; KUBLIHA, M. (Tehnica UTM, 2019)

The mixed alkaline effect (MAE) is a well-known anomaly in glasses. It results in a nonlinear response of various physical properties on mixing of lkali ions in the glass. In this work, the thermal depolarization currents ...
Preparation and caracterization of luminescent nanocomposite As2S3/Eu(TTA)2(Ph3PO)2NO3

BORDIAN, O.; VERLAN, V.; CULEAC, I.; ZUBAREV, V.; MALAHOV, L. (Tehnica UTM, 2019)

In this report we present preparation and characterisation of the luminescent nanocomposite (NC) As2S3/Eu(TTA)2(Ph3PO)2NO3. The initial powder materials As2S2 and Eu(TTA)2(Ph3PO)2NO3 were separately dissolved in the ...
Structural and optical properties of amorphous GeTe films

SIMANDAN, I. D.; GALCA, A. C.; SAVA, F.; BUCUR, C.; DUMITRU, V.; POROSNICU, C.; MIHAI, C.; VELEA, A. (Tehnica UTM, 2019)

Chalcogenide amorphous materials are known to have different structural and optical properties depending on the deposition method. Here, we investigate thin amorphous GeTe films [1] obtained through co-sputtering from ...
Mass transport effect and surface relief formation in AsxS100-x nanolayers

KONDRAT, O.; HOLOMB, R.; CSIK, A.; VERES, M.; MITSA, V. (Tehnica UTM, 2019)

Unique structural, electronic and optical properties have determined many various applications of chalcogenide glassy (ChG) materials. The large refractive indices and third-order optical nonlinearities of the chalcogenide ...
Raman microscopy of ferroelectric Sb-S-I glasses doped with Fe

CELIC, N.; GUT, I.; CAJKO, K.; BOSAK, O.; BARTOSOVA, A.; LUKIC–PETROVIC, S. (Tehnica UTM, 2019)

Chalcogenide glass-ceramics are very promising materials for different applications in the modern society. They are well known for their optical and electronic properties opening wide range of possible applications. Doping ...
Gradient Refractive INdex (GRIN) of chalcogenide glasses and glassceramics transparent in the infrared

LAVANANT, E.; CALVEZ, L.; ROZÉ, M.; HINGANT, T.; PROUX, R.; GUIMOND, YA.; ZHANG, X. (Tehnica UTM, 2019)

Gradient Refractive INdex (GRIN) lenses are optics whose refractive index varies spatially. One advantage of such lenses is the possibility to manufacture lenses with simple shapes, such as flat lenses where the optical ...
Nano crystallized chalcogenide for photovoltaic applications

ZHANG, X.; CATHELINAUD, M.; LIANG, G.; CHEN, S.; DONGLOU, R.; MA, H.; CALVEZ, L. (Tehnica UTM, 2019)

Sb2Se3 is a non-toxic and earth abundant compound and has been extensively studied for a wide range of applications including solar energy conversion. This compound with an orthorhombic structure has an inherent anisotropic ...
Interaction of chalcogenide glass/Ag dual films structures with e-beam and evaluation of the occurring effects on the performance of CBRAM devices

MITKOVA, M. (Tehnica UTM, 2019)

Among the many applications of chalcogenide glasses, their involvement as an active layer in redox-conductive-bridge-memory (CBRAM) devices triggers particular interest because of their potential to replace CMOS-based NAND ...
In memoriam of academician Andrei ANDRIESH the founder of non-crystalline semiconductor school in Republic of Moldova

POPESCU, M.; TSIULYANU, D.; IOVU, M. (Tehnica UTM, 2019)

Just over 85 years have passed since the birth of academician Andrei ANDRIESH, gone into eternity. He was born (October 24, 1933) and educated in Chisinau the capital of the present Republic of Moldova.
Charge transport peculiarities of amorphous Te films

CIOBANU, M.; MOCREAC, O.; AFANASIEV, A. (Tehnica UTM, 2019)

The charge transport in thin amorphous tellurium films was studied from investigation of temperature effect on both direct (DC) and alternating (AC) electrical conductivity. The films were grown by vacuum thermal evaporation ...
Spectral dependence of photoinduced surface relief grating formation in amorphous chalcogenides

REINFELDE, M.; TETERIS, J.; GRANTS, R. (Tehnica UTM, 2019)

The surface relief grating (SRG) formation in As40S60 and As40S15Se45 thin films by holographic recording with the laser wavelenghts in the spectral region of 375 – 671 nm was studied. A strong dependence of SRG formation ...
Surface plasmon resonance using As2S3 film for water salinity detection

BASCHIR, L.; MICLOS, S.; SAVASTRU, D.; POPESCU, A. A. (Tehnica UTM, 2019)

Amorphous chalcogenide As2S3 films used in surface plasmon resonance structures improves the sensitivity of sensors using such structures by providing them with sharp resonance characteristics: changes at the sixth decimal ...
Nano-structure formation in ternary chalcogenide thin films

IASENIUC, O.V.; IOVU, M.S. (Tehnica UTM, 2019)

Thin films of As-S-Se-Sn and As-Se-Ge chalcogenide semiconductors of different composition have been used for direct e-beam recording of diffraction grating structures by SEM, EBL, and holography techniques. As a result ...
Theoretical approach to study the solid state and optical characteristics of calcium sulpide [cas] thin film

UGWU, E. I. (Tehnica UTM, 2019)

Calsium sulphide thin film has been studied in this work using theoretical approach in which a scalar wave is propagated through the material thin film deposited on a glass substrate with the assumption that the dielectric ...

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