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- W2053005509 abstract "We present the results of picosecond time-resolved photoluminescence (PL) measurements for GaN/Al<SUB>x</SUB>Ga<SUB>1-x</SUB>N MQWs with varying structural parameters, grown by metalorganic chemical vapor deposition under the optimal GaN-like growth conditions. We have shown that the optimal GaN/AlGaN (x approximately 0.2) MQW structures for UV light emitter applications are those with well widths ranging from 12 and 42 angstroms and barrier widths ranging from 40 to 80 angstroms. The decreased quantum efficiency in GaN/Al<SUB>x</SUB>Ga<SUB>1-x</SUB>N MQWs with well width L<SUB>W</SUB> < 12 angstroms is due to the enhanced carrier leakage to the underlying GaN epilayers, while the decreased quantum efficiency in MQWs with well width L<SUB>W</SUB> > 42 angstroms is associated with an increased nonradiative recombination rate as L<SUB>W</SUB> approaching the critical thickness of MQWs. For the barrier width dependence, when the barrier width is below the critical thickness, the nonradiative recombination rate increases with a decrease of the barrier width due to the enhanced possibilities of the electron and hole wavefunctions at the interfaces as well as in the AlGaN barriers. On the other hand, the misfit dislocation density increases as the barrier width approaches the critical thickness, which can result in an enhanced nonradiative interface recombination rate. Our optimized GaN/Al<SUB>x</SUB>Ga<SUB>1-x</SUB>N MQW structures exhibited extremely high quantum efficiencies as well as a ratio of well emission intensity to barrier emission intensity exceeding 10<SUP>4</SUP>." @default.
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- W2053005509 date "2001-04-23" @default.
- W2053005509 modified "2023-09-27" @default.
- W2053005509 title "<title>Optimizing GaN/AlGaN multiple quantum well structures by time-resolved photoluminescence</title>" @default.
- W2053005509 doi "https://doi.org/10.1117/12.424744" @default.
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