Photoluminescence spectra of CuGaSe2 crystals

Kenji Yoshino, Mutsumi Sugiyama, Daisuke Maruoka, Shigefusa F. Chichibu, Hironori Komaki, Kenta Umeda, Tetsuo Ikari

Research output: Contribution to journalConference articlepeer-review

14 Citations (Scopus)

Abstract

CuGaSe2 (CGS) crystals (Cu/Ga = 0.9-1.4) which have been expected as photovoltaic applications were successfully grown by a vertical gradient freezing method. All samples were of the chalcopyrite structures, nearly stoichiometric and showed p-type conductivities. The samples became poor crystallinity with increasing enclosed Cu/Ga ratios in the Cu-rich region because the values of full-width at half-maximum at (112) diffraction lines increased with increasing enclosed Cu/Ga ratios. Lattice constants of a and c axes in the Cu-rich regions were larger than those in the Cu-poor regions, indicating that Cu atoms played an important role with the lattice constants. The grown stoichiometric CGS sample was of high quality since the free-exciton emission line was clearly observed in photoluminescence (PL) spectrum at 77K. The CGS samples turned out to have many donor- and acceptor-type defects because the donor-acceptor pair emission bands had considerable intensities in the PL spectra.

Original languageEnglish
Pages (from-to)357-363
Number of pages7
JournalPhysica B: Condensed Matter
Volume302-303
DOIs
Publication statusPublished - 2001 Jun 30
Externally publishedYes
EventYanada Conference LIV. 9th International Conference on Shallow-Level Centers in Semiconductors - Awaji Island, Hyogo, Japan
Duration: 2000 Sep 242000 Sep 27

Keywords

  • Chalcopyrite
  • CuGaSe
  • Photoluminescence
  • Solar cell

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Electrical and Electronic Engineering

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