| CROSS-DISCIPLINARY PHYSICS AND RELATED AREAS OF SCIENCE AND TECHNOLOGY |
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Green Emission from a Strain-Modulated InGaN Active Layer |
| WANG Guo-Biao1, XIONG Huan1, LIN You-Xi1, FANG Zhi-Lai1**, KANG Jun-Yong1, DUAN Yu2, SHEN Wen-Zhong2 |
1Semiconductor Photonics Research Center, Department of Physics, Xiamen University, Xiamen 361005
2Key Laboratory of Artificial Structures and Quantum Control (Ministry of Education), Department of Physics, Shanghai Jiao Tong University, Shanghai 200240 |
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| Cite this article: |
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WANG Guo-Biao, XIONG Huan, LIN You-Xi et al 2012 Chin. Phys. Lett. 29 068101 |
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Abstract Strain-induced quantum dots (QDs) like island formations are demonstrated to effectively suppress pits/dislocation generation in high indium content (26.8%) InGaN active layers. In addition to the strain redistribution in the QD-like islands, strain modulation on the InGaN active layers by using the GaN island capping is employed to form an increased surface potential barrier around the dislocation cores, which inhibits the carrier transport to the surrounding dislocations. Cathodoluminescence shows distinct double-peak emissions at 503 nm and 444 nm, corresponding to the In-rich QD-like emission and the normal quantum well emission, respectively. The QD-like emission becomes dominated in photoluminescence due to the carrier localization effect of In-rich InGaN QDs at relatively low "carrier injection current". Accordingly, green emission may be enhanced by the following origins: (1) reduction in pits/dislocations density, (2) carrier localization and strain reduction in QDs, (3) strain modulation by GaN island capping, (4) enhanced light extraction with faceted GaN islands on the surface.
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Received: 09 January 2012
Published: 31 May 2012
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| PACS: |
81.07.-b
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(Nanoscale materials and structures: fabrication and characterization)
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81.05.Ea
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(III-V semiconductors)
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78.67.-n
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(Optical properties of low-dimensional, mesoscopic, and nanoscale materials and structures)
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68.65.-k
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(Low-dimensional, mesoscopic, nanoscale and other related systems: structure and nonelectronic properties)
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