Güncel Gönderiler: Fen Fakültesi
Toplam kayıt 2379, listelenen: 2201-2220
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Classical and quantum hall effect measurements in GaInNAs/GaAs quantum wells
(Elsevier Science BV, 2013)We have performed magneto-transport experiments in modulation-doped Ga0.7In0.3NyAs1-y/GaAs quantum wells with nitrogen mole fractions 0.4%, 1.0% and 1.5%. Classical magnetotransport (resistivity and low-field Hall effect) ... -
Structural and optical characterization of InAs/GaSb type-II superlattices: Influence of the change in InAs and GaSb layer thicknesses for fixed InSb-like interfaces
(Elsevier Science Sa, 2015)In this article, we report on the molecular beam epitaxy growth and characterization of a 140 period InAs/GaSb type-II superlattice structure designed for mid infrared detection. Thickness of a period was systematically ... -
SiC Substrate Effects on Electron Transport in the Epitaxial Graphene Layer
(Korean Inst Metals Materials, 2014)Hall effect measurements on epitaxial graphene (EG) on SiC substrate have been carried out as a function of temperature. The mobility and concentration of electrons within the two-dimensional electron gas (2DEG) at the EG ... -
On the structural characterization of InAs/GaSb type-II superlattices: The effect of interfaces for fixed layer thicknesses
(Elsevier Science Sa, 2013)We report on the detailed epitaxial growth conditions for type-II InAs/GaSb superlattice (SL) structures designed for mid-wave infrared detection. The mismatch between the GaSb buffer and the SL is precisely controlled by ... -
Determination of dislocation densities in InN
(Wiley-V C H Verlag GMBH, 2012)The magneto-transport measurements, carried out at magnetic fields up to 11 T and in the temperature range between 1.8 K and 300 K, are used to investigate the scattering mechanisms in GaN/InN/AlN double heterojunctions. ... -
Longitudinal polar optical phonons in InN/GaN single and double heterostructures
(Wiley-V C H Verlag GMBH, 2011)Longitudinal optical phonon energy in InN epi-layers has been determined independently from the Raman spectroscopy and temperature dependent Hall mobility measurements. Raman spectroscopy technique can be used to obtain ... -
The transport properties of Dirac fermions in chemical vapour-deposited single-layer graphene
(Taylor & Francis LTD, 2017)The electronic transport properties of Dirac fermions in chemical vapour-deposited single-layer epitaxial graphene on an SiO2/Si substrate have been investigated using the Shubnikov-de Haas (SdH) oscillations technique. ... -
Scattering analysis of 2DEG mobility in undoped and doped AlGaN/AlN/GaN heterostructures with an in situ Si3N4 passivation layer
(Pergamon-Elsevier Science LTD, 2016)The scattering mechanisms limiting mobility for low-dimensional charge carriers in a two-dimensional electron gas (2DEG) in undoped and doped AlGaN/AlN/GaN heterostructures with and without Si3N4 passivation are investigated. ... -
Energy relaxation of hot electrons by LO phonon emission in AlGaN/AlN/GaN heterostructure with in situ Si3N4 passivation
(Elsevier Science Sa, 2016)In this study, energy relaxation mechanisms of electrons in AlGaN/AlN/GaN High Electron Mobility Transistor (HEMT) structures with and without in situ Si3N4 passivation were investigated. Although the physical parameters ... -
The variation of temperature-dependent carrier concentration and mobility in AlGaN/AlN/GaN heterostructure with SiN passivation
(Wiley-V C H Verlag GMBH, 2015)The effects of surface passivation effect on electron mobility and crystal structure in Al0.3Ga0.7N/AlN/GaN heterostructures are investigated by classical Hall effect measurements and an X-ray diffraction method. ... -
Complementary and alternative technique for the determination of electron effective mass: quantum Hall effect
(Natl Inst Optoelectronics, 2016)The quantum Hall effect measurements in the AlInN/AlN/GaN heterostructure are studied in the temperature range from 1.8 K to 14 K and a magnetic field up to 11 T. The quantized two-dimensional electron gas was placed at ... -
1,1 '-Bis-(n-benzotriazolyl) ferrocenecarboxamide: Precursor for synthesis of 1,1 '-bis-ferrocenoyl esters and thioesters
(Elsevier Science Sa, 2014)A microwave assisted synthesis methodology has been presented for the preparation of the bisferrocenoyl esters and thioesters. 1,1'-bis-ferrocenedicarboxylic acid was derivatized using direct H-1-benzotriazole/SOCl2 ... -
Temperature and magnetic field effect on oscillations observed in GaInNAs/GaAs multiple quantum wells structures
(Elsevier Science BV, 2012)The photoconductivity of p-i-n GaInNAs/GaAs multiple quantum well (MQW) mesa structures is investigated. When illuminated with photons at energy greater than the GaAs bandgap, a number of oscillations are observed in the ... -
A density functional theory investigation on amantadine drug interaction with pristine and B, Al, Si, Ga, Ge doped C60 fullerenes
(Elsevier Science BV, 2017)Amantadine is a well-known drug for its treatment effect on Parkinson's disease and influenza infection or hepatitis. Heteroatom doped fullerenes have been extensively examined for their possible usage in sensor technology ... -
FT-IR, NMR SPECTROSCOPIC and QUANTUM MECHANICAL INVESTIGATIONS OF TWO FERROCENE DERIVATIVES
(Chem Soc Ethiopia, 2017)New ferrocene derivatives as N-(3-piperidin-1-ylpropyl) ferrocenamide (Fc-3ppa) and N-( pyridine-3-ylmethyl) ferrocenamide (Fc-3pica) and structural investigations were carried out with H-1, C-13, DEPT 45 or 135, HETCOR, ... -
Adsorption mechanism, structural and electronic properties: 4-Phenylpyridine & undoped or doped (B or Si) C60
(Elsevier Science BV, 2017)Interaction mechanisms of fullerene derivatives and various types of molecules have been paid increasing attention. In this research, interaction mechanism, structural and electronic properties, natural bond orbital (NBO) ... -
Conformational and electronic properties of N-methacryloyl-(L)-glutamic acid
(Taylor & Francis LTD, 2017)Conformers of N-methacryloyl-(L)-glutamic acid (MAGA, C9H13NO5) in the gas phase, benzene or methanol environment were searched by the density functional theory (DFT) and time-dependent DFT. Selected conformational isomers ... -
Three-color broadband asymmetric quantum well infrared photodetectors in long wavelength infrared range (LWIR)
(Springer, 2010)A theoretical investigation of a GaAs/AlGaAs-material-system-based four quantum well infrared detector structures consisting of ten periods of three asymmetric quantum well units are presented. Each quantum well in the ... -
DFT, FT-IR and Raman investigations of 1-pyrrolidino-1-cyclopentene
(Pergamon-Elsevier Science LTD, 2013)FT-IR and Raman spectra of 1-pyrrolidino-1-cyclopentene (1py1cp) were experimentally reported in the region of 4000-10 cm(-1) and 4000-100 cm(-1), respectively. The optimized geometric parameters, normal mode frequencies ... -
NMR, FT-IR spectroscopic studies and molecular docking study of 4-acetoxyphenethyl acrylate
(World Scientific Publ Co Pte LTD, 2017)Conformational, structural, vibrational spectroscopic properties and nuclear magnetic chemical shift values of 4-acetoxyphenethyl acrylate (4APA) were investigated using spectroscopic and theoretical approaches including ...
