Excitons in PL Spectra of Cu(In,Ga)Se2 Single Crystals

E. Skidchenko, M. V. Yakushev, L. Spasevski, P. R. Edwards, M. A. Sulimov, R. W. Martin

Research output: Contribution to journalArticle

Abstract

Abstract: A photoluminescence (PL) study of Cu(In,Ga)Se2 (CIGSe) single crystals, (grown by the vertical Bridgman technique) with the [Ga]/[Ga + In] ratio of 7 and 12% and the [Cu]/[In + Ga] ratio greater than unity, as measured by energy dispersive spectroscopy, is presented. Analysis of the excitation intensity and temperature dependence of the PL spectra suggested the excitonic nature of the observed near-band-edge emissions peaks. Free and bound excitons in CIGSe single crystals with both 7 and 12% Ga content are clearly observed, analyzed and identified. An activation energy of 19 meV is determined for the free exciton in the PL spectra of the sample with 12% Ga. The presence of the excitons demonstrated a high structural quality of the material.

Original languageEnglish
Pages (from-to)918-924
Number of pages7
JournalPhysics of the Solid State
Volume61
Issue number5
DOIs
Publication statusPublished - 1 May 2019

Keywords

  • photoluminescence
  • PL
  • Cu(In,Ga)Se2 single crystals
  • excitons

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