Carrier Recombination Processes in Gallium Indium Phosphide Nanowires

Wei Zhang, Xulu Zeng, Xiaojun Su, Xianshao Zou, Pierre Adrien Mante, Magnus T. Borgström, Arkady Yartsev

Research output: Journal article publicationJournal articleAcademic researchpeer-review

11 Citations (Scopus)

Abstract

Understanding of recombination and photoconductivity dynamics of photogenerated charge carriers in Ga x In 1-x P NWs is essential for their optoelectronic applications. In this letter, we have studied a series of Ga x In 1-x P NWs with varied Ga composition. Time-resolved photoinduced luminescence, femtosecond transient absorption, and time-resolved THz transmission measurements were performed to assess radiative and nonradiative recombination and photoconductivity dynamics of photogenerated charges in the NWs. We conclude that radiative recombination dynamics is limited by hole trapping, whereas electrons are highly mobile until they recombine nonradiatively. We also resolve gradual decrease of mobility of photogenerated electrons assigned to electron trapping and detrapping in a distribution of trap states. We identify that the nonradiative recombination of charges is much slower than the decay of the photoluminescence signal. Further, we conclude that trapping of both electrons and holes as well as nonradiative recombination become faster with increasing Ga composition in Ga x In 1-x P NWs. We have estimated early time electron mobility in Ga x In 1-x P NWs and found it to be strongly dependent on Ga composition due to the contribution of electrons in the X-valley.

Original languageEnglish
Pages (from-to)4248-4254
Number of pages7
JournalNano Letters
Volume17
Issue number7
DOIs
Publication statusPublished - 12 Jul 2017
Externally publishedYes

Keywords

  • carrier recombination
  • Gallium indium phosphide
  • mobility
  • nanowire
  • photoconductivity

ASJC Scopus subject areas

  • Bioengineering
  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanical Engineering

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