Individual identification of free hole and electron dynamics in CuIn1-xGaxSe2 thin films by simultaneous monitoring of two optical transitions

Makoto Okano, Hideki Hagiya, Takeaki Sakurai, Katsuhiro Akimoto, Hajime Shibata, Shigeru Niki, Yoshihiko Kanemitsu

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

The photocarrier dynamics of CuIn1-xGaxSe2 (CIGS) thin films were studied using white-light transient absorption (TA) measurements, as an understanding of this behavior is essential for improving the performance of solar cells composed of CIGS thin films. A characteristic double-peak structure due to the splitting of the valance bands in the CIGS was observed in the TA spectra under near-band-gap resonant excitation. From a comparison of the TA decay dynamics monitored at these two peaks, it was found that the slow-decay components of the electron and hole relaxation are on the nanosecond timescale. This finding is clear evidence of the long lifetimes of free photocarriers in polycrystalline CIGS thin films.

Original languageEnglish
Article number181903
JournalApplied Physics Letters
Volume106
Issue number18
DOIs
Publication statusPublished - 2015 May 4
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

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