Suppression of metastable-phase inclusion in N-polar (000 1¯) InGaN/GaN multiple quantum wells grown by metalorganic vapor phase epitaxy

Kanako Shojiki, Jung Hun Choi, Takuya Iwabuchi, Noritaka Usami, Tomoyuki Tanikawa, Shigeyuki Kuboya, Takashi Hanada, Ryuji Katayama, Takashi Matsuoka

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4 Citations (Scopus)

Abstract

The metastable zincblende (ZB) phase in N-polar (0001¯) (-c-plane) InGaN/GaN multiple quantum wells (MQWs) grown by metalorganic vapor phase epitaxy is elucidated by the electron backscatter diffraction measurements. From the comparison between the -c-plane and Ga-polar (0001) (+c-plane), the -c-plane MQWs were found to be suffered from the severe ZB-phase inclusion, while ZB-inclusion is negligible in the +c-plane MQWs grown under the same growth conditions. The ZB-phase inclusion is a hurdle for fabricating the -c-plane light-emitting diodes because the islands with a triangular shape appeared on a surface in the ZB-phase domains. To improve the purity of stable wurtzite (WZ)-phase, the optimum conditions were investigated. The ZB-phase is dramatically eliminated with decreasing the V/III ratio and increasing the growth temperature. To obtain much-higher-quality MQWs, the thinner InGaN wells and the hydrogen introduction during GaN barriers growth were tried. Consequently, MQWs with almost pure WZ phase and with atomically smooth surface have been demonstrated.

Original languageEnglish
Article number222102
JournalApplied Physics Letters
Volume106
Issue number22
DOIs
Publication statusPublished - 2015 Jun 1

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

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