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Semiconductor nanowires grown via the vapour-liquid-solid (VLS) mechanism are promising for miniaturisation of optoelectronic devices. Efficient optoelectronic devices require these nanowires to have high quantum efficiency. While optimizing the growth process to eliminate bulk defects and achieve perfect surface passivation is one approach to increase the quantum efficiency of nanowires1, coupling...
We study the possibility of increasing the quantum efficiency of III–V semiconductor nanowire emitters using plasmonics. Results on the effect of plasmonic nanoparticle size, emitter-plasmonic nanoparticle distance and the initial quantum efficiency of the emitter on the quantum efficiency enhancement factor are presented.
III–V semiconductors like GaAs and InGaN are very promising candidates for solar cells. While GaAs has near-ideal bandgap to reach the maximum possible efficiency limit for single junction solar cells, InGaN provides the ability to tune the bandgap of absorbing layers over a wide energy range. Since III–V semiconductors are mostly direct bandgap semiconductors, they are also very strong absorbers...
We demonstrate that plasmonic light trapping effect can be used to improve all the main device characteristics of self-assembled InGaAs/GaAs quantum dot solar cell. The underlying physical processes of carrier occupation, transportation, and recombination within the plasmonic quantum dot solar cells will be discussed.
Plasmonic nano-antennas constructed by placing a sub-wavelength dielectric (e.g., air) gap between two metallic regions can generate high intense electric fields in small regions which can be used to excite nonlinear effects such as the Surface Enhanced Raman Scattering or to visualize nano-particles. However, since nano-antennas are passive devices, they need to be driven by external light sources...
Two different Au catalysts were used to grow GaAs epitaxial nanowires on GaAs (111)B substrates. Detailed investigations have shown that using Au thin film and annealing technique, it is possible to achieve nanowire growth with much higher density comparing to using Au nanoparticles. It is found that the tapering and lattice defects normally observed in nanowires induced by Au nanoparticles were reduced...
GaAs and InP based nanowires were grown epitaxially on GaAs or InP (111)B substrates by MOCVD via VLS mechanism. In this paper, I will give an overview of nanowire research activities in our group.
GaAs and InP based nanowires were grown epitaxially on GaAs or InP (111)B substrates by metalorganic chemical vapor deposition using Au nanoparticles as catalyst. In this talk, I will give an overview of nanowire research activities in our group. Especially, the effects of growth parameters for GaAs and InP nanowires on the crystal quality have been studied in detail. We demonstrated the ability to...
In this paper, we demonstrate the key issues of axial nanowire heterostructures, such as, the fundamental criteria for formation and failure of axial nanowire heterostructures via vapor-liquid-solid mechanism and lateral misfit strain relaxation in these structures. We show the failure of axial nanowire heterostructures by growing InAs axially on GaAs nanowires, and the lateral misfit strain relaxation...
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