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We report the growth of InP/InGaAs core-shell nanowires by metal organic chemical vapour deposition (MOCVD). The grown nanowires are distributed uniformly and are vertical to the substrate. The coreshell nanowires have been structurally characterised by scanning electron microscopy and transmission electron microscopy.
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...
The sidewall facets of GaAs nanowires (NWs) were studied. It has been found that the sidewalls of GaAs NWs grown at 450 °C are {112} facets. However, the sidewalls of GaAs NWs start to become {110} during the postannealing at 650 °C for 30 min.
Growth of Au-catalyzed InP nanowires (NWs) by metalorganic chemical vapor deposition (MOCVD) has been studied in the temperature range of 400-510°C and V/III ratio of 44-700. We demonstrate that minimal tapering of InP NWs can be achieved at 400°C and V/III ratio of 350. Zinc-blende (ZB) or wurtzite (WZ) NWs is obtained depending on the growth conditions. 4K microphotoluminescence (μ-PL) studies show...
In view of the important application of GaAs and GaN photocathodes in electron sources [1,2], the difference in the photoemission behavior, namely the activation process and quantum yield decay, between the two typical types of III-V compound photocathodes has been investigated using the multi-information measurement system. The reflection-mode GaAs and GaN photocathode samples both were grown by...
We report the effect of V/III ratio and nanowire diameter on the crystal structure and optical properties of InP nanowires. Time -resolved photoluminescence studies have revealed that wurtzite nanowires show longer carrier lifetimes than zinc-blende ones.
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...
InP and GaAs based nanowires were grown epitaxially on InP or GaAs (111)B substrates by metalorganic chemical vapor deposition via vapor-liquid-solid (VLS) mechanism. In this report, I will give an overview of nanowire research activities in our group. In particular, the effects of growth parameters for InP and GaAs nanowires on the crystal quality have been studied in detail. We demonstrated the...
Semiconductor nanowire (NW) heterostructures are increasingly important building blocks for electronic and optoelectronic devices. III-V nanowires with attention to well-controlled growth parameters, high structural quality and high optical quality NWs with unusually long recombination lifetimes can be achieved. We probe these NWs experimentally with both CW and time-resolved photoluminescence spectroscopy...
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...
Summary form only given. In the last few years, semiconductor nanowires (NWs) have attracted intensive attention due to both the intriguing fundamental properties and their potential applications in optoelectronic devices. GaAs NWs grown by metalorganic chemical vapor deposition (MOCVD) often exhibit tapered and kinked morphologies, depending on growth temperature. However, straight NWs of uniform...
The kinks formation in heterostructural nanowires was observed to be dominant when InAs nanowires were grown on GaAs nanowires. Nanowires were grown through vapor-liquid-solid (VLS) mechanism in an MOCVD (metalorganic chemical vapor deposition) reactor. GaAs nanowires were grown in [1 1 1 ]B direction on a GaAs (1 1 1 )B substrate. When InAs nanowires grown on the GaAs nanowires, most of the InAs...
The characteristics of DFB lasers, external cavity tunable lasers, and semiconductor optical amplifiers are presented to demonstrate the versatility of GaAs-based quantum dot materials technology. For the DFB laser, a temperature-insensitive slope efficiency, low threshold, and feedback resistance are primary advantages. The external cavity tuned device has a 90 nm range, and the SOA demonstrates...
The heterostructure field effect transistors with a doping dipole layer obtained by planar p/sup ++/ and n/sup ++/ layers in charge control layer are proposed and fabricated in AlGaAs/GaAs. The dipole creates a large barrier between the channel and the gate, and this leads to a reduction of the forward biased gate current, a broad transconductance peak, a high maximum drain current, and no negative...
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