Slow intraband relaxation and localization of photogenerated carriers in CuIn1-x Gax Se2 thin films: Evidence for the existence of long-lived high-energy carriers

Makoto Okano, Yutaro Takabayashi, Takeaki Sakurai, Katsuhiro Akimoto, Hajime Shibata, Shigeru Niki, Yoshihiko Kanemitsu

Research output: Contribution to journalArticle

17 Citations (Scopus)

Abstract

The dynamics of free carriers in polycrystalline CuIn1-xGaxSe2 (CIGS) thin films were studied using picosecond time-resolved photoluminescence (PL) and femtosecond transient-absorption (TA) measurements. The PL spectrum and the TA decay component due to the band-to-band recombination of free carriers were observed in the picosecond time region. From excitation-photon-energy-dependent TA measurements, we identified a slow intraband relaxation of free carriers in the CIGS thin films. Collectively, the combination of PL and TA experiments reveal a global feature of energy relaxation and recombination processes of free carriers in the femtosecond to nanosecond time regions.

Original languageEnglish
Article number195203
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume89
Issue number19
DOIs
Publication statusPublished - 2014 May 20
Externally publishedYes

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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