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Proceedings Paper

Study of efficiency droop in InGaN/GaN light emitting diodes with V-shape pits
Author(s): Chiao-Yun Chang; Heng Li; Tien-Chang Lu
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Paper Abstract

We invesstagated the relationship between the emission efficiency of InGaN/GaN multiple quantum wells (MQWs) and the V-shape pits (V-pits) forming along the threading dislocation (TD). The thinner InGaN/GaN MQWs on the side walls around V-pits would create higher local energy barriers, which can resist the carriers trapped into the non-radiative recombination centres within TDs. By inserting different InGaN/GaN superlattice (SLS) layers below the MQWs, sizes of V-pits could be properly controlled. It was found that the V-pit size on InGaN MQWs increased with increasing SLS layers, which could decrease energy barriers. On the contrary, the shorter distance between the TD center and V-pit boundary would increase the carrier capturing capability of TDs in smaller V-pits. By properly controlling the V-shape defect formation, the best internal quantum efficiency of about 70%f was found in the MQWs with underlying 15 periods SLS layers.

Paper Details

Date Published: 13 March 2015
PDF: 6 pages
Proc. SPIE 9363, Gallium Nitride Materials and Devices X, 93631Q (13 March 2015); doi: 10.1117/12.2078122
Show Author Affiliations
Chiao-Yun Chang, National Chiao Tung Univ. (Taiwan)
Heng Li, National Chiao Tung Univ. (Taiwan)
Tien-Chang Lu, National Chiao Tung Univ. (Taiwan)

Published in SPIE Proceedings Vol. 9363:
Gallium Nitride Materials and Devices X
Jen-Inn Chyi; Hiroshi Fujioka; Hadis Morkoç, Editor(s)

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