Influence of polarity on carrier transport in semipolar (2021̄) and (202̄1) multiple-quantum-well light-emitting diodes

Yoshinobu Kawaguchi, Chia Yen Huang, Yuh Renn Wu, Qimin Yan, Chih Chien Pan, Yuji Zhao, Shinichi Tanaka, Kenji Fujito, Daniel Feezell, Chris G. Van De Walle, Steven P. Denbaars, Shuji Nakamura

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Abstract

We investigate the influence of polarity on carrier transport in single-quantum-well and multiple-quantum-well (MQW) light-emitting diodes (LEDs) grown on the semipolar (202̄1) and (2021̄) orientations of free-standing GaN. For semipolar MQW LEDs with the opposite polarity to conventional Ga-polar c-plane LEDs, the polarization-related electric field in the QWs results in an additional energy barrier for carriers to escape the QWs. We show that semipolar (2021̄) MQW LEDs with the same polarity to Ga-polar c-plane LEDs have a more uniform carrier distribution and lower forward voltage than (202̄1) MQW LEDs.

Original languageEnglish (US)
Article number231110
JournalApplied Physics Letters
Volume100
Issue number23
DOIs
Publication statusPublished - Jun 4 2012
Externally publishedYes

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ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

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