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We investigate the optical and transport properties of single GaAs/AlGaAs core-multishell Quantum Well Tube (QWT) nanowire heterostructure. The QWT is defined by a thin (8 nm) GaAs layer embedded inside a thick Al0.4Ga0.6As shell which surrounds a 50 nm diameter GaAs NW core see Fig.1. The electrons and holes in the thin GaAs shell are radially confined and are free along the nanowire length. The...
Optical pump-terahertz probe spectroscopy was used to study the key electronic properties of GaAs, InAs and InP nanowires at room temperature. Of all nanowires studied, InAs nanowires exhibited the highest mobilities of 6000 cm2V−1s−1. InP nanowires featured the longest photoconductivity lifetimes and an exceptionally low surface recombination velocity of 170 cm/s.
III–V semiconductor nanowires hold outstanding potential as key component for future photonic and electronic devices, among which GaAs/AlGaAs heterostructure nanowires wires show particular promise. However, due to the large surface-to-volume ratio, the carrier lifetime and mobility of GaAs nanowires are extremely sensitive to the surface/interface states. Although nearly intrinsic exciton lifetimes...
N-type silicon modulation doping was introduced into the barrier layers of InGaAs/GaAs quantum dot solar cells (QDSC) at two different doping concentrations. An increased energy conversion efficiency of 8.91 % was obtained for the modulation doped device compared to 6.95 % of the undoped sample due to the additional electron population in the active structure.
GaAs/AlxGa1−xAs core-shell nanowires were grown by metal organic chemical vapour deposition with Au-catalysed GaAs cores. Cross-section transmission electron microscope bright field images show that the tapering at bottom of the nanowires is mainly caused by GaAs cap growth. Time-resolved photo-luminescence measurements of single nanowires were taken at room temperature and a minority carrier lifetime...
An analysis of the temperature dependent dark current and spectral response characteristics of an In0.5Ga0.5As/GaAs quantum dot solar cell has been performed to determine the dominant physical processes that lead to a reduction of the open circuit voltage compared with reference single junction GaAs solar cells.
This paper investigated the temperature effect on the electrical properties of an In0.5Ga0.5As/GaAs QD solar cell, leading to a better understanding of the basic cell characteristics influenced by QD incorporation which is of great importance for future design of high efficiency QD solar cells.
We investigate the growth of III-V nanowires by MOCVD and the structural and optical properties of these nanowires. Binary and ternary nanowires of GaAs, InAs, InP, AlGaAs and InGaAs are achieved. We discuss the nucleation and growth issues involved in fabricating high quality nanowires suitable for device applications. We have fabricated and characterised a variety of axial and radial heterostructures...
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