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Thin-Wall GaN/InAlN Multiple Quantum Well Tubes
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DOI：10.1021/acs.nanolett.6b04852.png)
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摘要
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Thin-wall tubes composed of nitride semiconductors (III-N compounds) based on GaN/InAlN multiple quantum wells (MQWs) are fabricated by metalorganic vapor-phase epitaxy in a simple and full III-N approach. The synthesis of such MQW-tubes is based on the growth of N-polar c-axis vertical GaN wires surrounded by a coreshell MQW heterostructure followed by in situ selective etching using controlled H-2/NH3 annealing at 1010 degrees C to remove the inner GaN wire part. After this process, well-defined MQW-based tubes having nonpolar m-plane orientation exhibit UV light near 330 nm up to room temperature, consistent with the emission of GaN/InAlN MQWs. Partially etched tubes reveal a quantum-dotlike signature originating from nanosized GaN residuals present inside the tubes. The possibility to fabricate in a simple way thin-wall III-N tubes composed of an embedded MQW-based active region offering controllable optical emission properties constitutes an important step forward to develop new nitride devices such as emitters, detectors or sensors based on tubelike nanostructures.
Keyword:
Nanotubes
multiple quantum wells
nitride semiconductors
MOVPE
quantum dots
UV emission
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9.1
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2.7W
被引数:
16.5W
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