Photoluminescence Properties of GaN Nanowires Grown in a Gradient-Plasma Environment

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

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Author(s)

  • Yu-Hang Ji
  • An-Ping Huang
  • Qin Gao
  • Wen-Zhen Dou
  • Yan-Qi Liu
  • Meng-Qi Yang
  • Mei Wang
  • Zhi-Song Xiao
  • Ru-Zhi Wang

Detail(s)

Original languageEnglish
Pages (from-to)16002-16008
Journal / PublicationJournal of Physical Chemistry C
Volume124
Issue number29
Online published25 Jun 2020
Publication statusPublished - 23 Jul 2020

Abstract

Herein, we report the plasma effect on the surface defects of GaN nanowires (NWs). A gradient plasma growth system by microwave plasma chemical vapor deposition is demonstrated for NWs growth. The structure and surface defects of NWs are affected by the plasma distribution. The PL results show that emission peaks at ∼355, ∼374, and ∼389 nm arising from near band edge emission are observed from the GaN NWs under different plasma growth environment. The relative emission area (Erelative) of the specific emission peaks to total emission area (Etotal) from the different growth regions also changes. The reason for variant ratio Erelative/Etotal is related to the surface defects including structural defects and oxygen incorporation according to the results of high-resolution transmission electron microscopy and X-ray photoelectron spectroscopy. The analysis of PL properties provided a strong evidence for formation of distinct surface defects. The emission mechanism of GaN NWs grown in a high-density plasma environment enriches our understanding of the plasma effects on the surface defects and optical property, and the knowledge is important to the development of nano-optoelectronic devices.

Research Area(s)

  • GALLIUM NITRIDE, DEFECTS, LUMINESCENCE, SUBSTRATE, XPS

Citation Format(s)

Photoluminescence Properties of GaN Nanowires Grown in a Gradient-Plasma Environment. / Ji, Yu-Hang; Huang, An-Ping; Gao, Qin; Dou, Wen-Zhen; Liu, Yan-Qi; Yang, Meng-Qi; Wang, Mei; Xiao, Zhi-Song; Wang, Ru-Zhi; Chu, Paul K.

In: Journal of Physical Chemistry C, Vol. 124, No. 29, 23.07.2020, p. 16002-16008.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review