Fabrication of InGaN/GaN Multiple Quantum Wells on (1\bar{1}01) GaN
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概要
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InGaN/GaN multiple quantum wells (MQWs) on semipolar (1\bar{1}01) GaN microstripes on a Si substrate were fabricated and their optical properties were investigated. From cathodoluminescence (CL) analysis, strong CL emission was obtained in an MQW emitting at 433 nm. However, dark lines appeared in MQWs emitting at longer wavelengths. These dark lines are attributed to lattice relaxation and the generation of misfit dislocations and stacking faults in an MQW, resulting in nonradiative centers. The internal quantum efficiency (IQE) was estimated from excitation-power-dependent photoluminescence analysis. The (1\bar{1}01) InGaN/GaN MQW had a high IQE owing to the high crystalline quality of the underlying GaN and the reduced piezoelectric field. The IQE at a carrier concentration of 1\times 10^{18} cm<sup>-3</sup>in a sample emitting at 490 nm was as high as 90%. The efficiency decreased in a sample with a higher indium content in the MQW due to the generation of misfit dislocations and stacking faults.
- 2013-08-25
著者
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Amano Hiroshi
Department of Cardiology and Pneumology, Dokkyo University School of Medicine
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YAMAGUCHI Masahito
Department of Electrical Engineering and Computer Science, Graduate School of Engineering, Nagoya University
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Sano Tomotaka
Department of Electrical Engineering and Computer Science, Akasaki Research Center, Nagoya University, Nagoya 464-8603, Japan
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Honda Yoshio
Department of Chemistry, Faculty of Science, Kanazawa University
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Tanikawa Tomoyuki
Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan
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Kushimoto Maki
Department of Electrical Engineering and Computer Science, Nagoya University, Nagoya 464-8603, Japan
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