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Nanowires are promising candidates for photovoltaic devices due to their large band gaps and reduced electron-phonon interactions. In the present paper, full band Monte Carlo simulations are performed on square In0.53Ga0.47As nanowires along [100] cladded with InP to study the energy relaxation of carriers in these wires. The carriers are optically excited above the band gap of the cladded nanowire...
Atmospheric pressure plasma-enhanced chemical vapor deposition (AP-PECVD) was applied for the fabrication of amorphous indium gallium zinc oxide thin-film transistors (a-IGZO TFTs). In this work, a-IGZO TFTs fabricated by AP-PECVD technique were firstly treated by post deposition of in-situ Ar/H2 plasma with atmospheric pressure plasma Jet (APPJ). Compared to without plasma treatment, samples with...
Layer undulation of InGaAs/GaAs/GaAsP strain-balanced quantum well superlattice forms InGaAs nanowires along the bunching steps on a vicinal substrate embedded in the GaAs/GaAsP matrix. When it is used as an absorber in a GaAs single-junction cell, it assists carrier escape from narrow-gap InGaAs and extends photoluminescence lifetime as compared with a planar superlattice. Such a wire structure can...
According to the Bloch theorem and the symmetry of superlattice configuration, a new 3D finite element method is employed to calculate the miniband structure and density of state for well-aligned Ge/Si QDs array. This method can overcome the approximation of multi-dimensional Kronig-Penny model and constrain on QDs superlattice structure. The interaction of electronic structure among Ge/Si QDs with...
In this work, the deposition of 3-nm dispersed Zinc-Oxide (ZnO) nanislands by thermal Atomic Layer Deposition (ALD) is demonstrated. The physical and electronic properties of the islands are studied using Atomic Force Microscopy, UV-Vis-NIR spectroscopy, and X-ray Photoelectron Spectroscopy. The results show that there is quantum confinement in 1D in the nanoislands which is manifested by the increase...
Ultra-wide bandgap (>3.4 eV) oxide semiconductors can offer opportunity for opening application fields for sustainable development of the community. In the presentation, recent evolution of wide bandgap semiconductors based on α-Al2O3, α-Ga2O3, α-In2O3, and rocksalt MgZnO will be reviewed.
In this paper we present first principle study on bismuth nanowires (BiNWs) with few nanometers in diameter which indicates that along trigonal crystallographic orientation a large bandgap in the order of few electron-volts is achievable due to quantum confinement. It is shown that there is a considerable dependency of the bandgap opening and surface reconstruction on the orientation. The results...
We present a general framework for simulating interfaces using an atomistic approach based on density functional theory and non-equilibrium Green's functions. The method includes all the relevant ingredients, such as doping and an accurate value of the semiconductor band gap, required to model realistic metal-semiconductor interfaces and allows for a direct comparison between theory and experiments...
In this paper we review our recent results on optical properties of coaxial nanowires (NWs) based on dilute nitride alloys, such as GaAsN and GaNP. We show that these structures have a high structural and optical quality, and can potentially be used as polarized nano-scale light sources that emit linearly polarized light with the polarization direction perpendicular to the wire axis even in zinc blende...
This article presents a computational study on the impact of layer distance on the miniband formulation and density of state under different quantum dot structural parameters-height, interdot space-in a bilayer and well-aligned Ge/Si quantum-dot array. The miniband bandwidth, energy and effective bandgap is tunable by introducing an additional quantum dot layer. When the vertical distance between...
We investigate the enhancement of acousto-optic (AO) coupling using a Ag/GaAs heterogeneous phoxonic crystal nanobeam cavity. Because of the Ag layer, the cavity structure hybridizes surface plasmons and photons, squeezing the optical energy into a smaller region near the GaAs/Ag interface. The photonic cavity modes highly match the phononic cavity modes in space in the cavity. Because of the mode...
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