Optical properties of fresh dislocations in GaN

I. Yonenaga, Y. Ohno, T. Taishi, Y. Tokumoto, H. Makino, T. Yao, Y. Kamimura, K. Edagawa

研究成果: Article査読

11 被引用数 (Scopus)

抄録

Optical properties of fresh dislocations, (a/3)[1 1 2̄ 0]-type edge dislocations on the (1 1̄ 0 0) prismatic plane, introduced into GaN by plastic deformation at elevated temperatures were investigated by photoluminescence and optical absorption measurements. Plastic deformation acts as an effective passivation, leading to remarkable reduction of near-band-edge photoluminescence intensity centered at 3.48 eV and noticeable red-shift of the optical absorption edge. In a model of the FranzKeldysh effect, the induced edge dislocations posses nonradiative trap sites around 3e/c along their core, resulting in the reduction of free-carrier concentration. Also, the induced dislocations give rise to some luminescence peaks in the energy range 1.72.4 eV, differing from the yellow luminescence, which implies the formation of radiative recombination centers by the dislocations.

本文言語English
ページ(範囲)415-417
ページ数3
ジャーナルJournal of Crystal Growth
318
1
DOI
出版ステータスPublished - 2011 3 1

ASJC Scopus subject areas

  • 凝縮系物理学
  • 無機化学
  • 材料化学

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