Observation of unusual optical transitions in thin-film Cu(In, Ga)Se2solar cells

Yu Kuang Liao, Shou Yi Kuo, Woei Tyng Lin, Fang I. Lai, Dan Hua Hsieh, Min An Tsai, Shih Chen Chen, Ding Wen Chiou, Jen Chuang Chang, Kaung Hsiung Wu, Shun Jen Cheng, Hao Chung Kuo

Research output: Contribution to journalJournal Article peer-review

18 Scopus citations


In this paper, we examine photoluminescence spectra of Cu(In, Ga)Se2(CIGS) via temperature-dependent and power-dependent photoluminescence (PL). Donor-acceptor pair (DAP) transition, near-band-edge transition were identified by their activation energies. S-shaped displacement of peak position was observed and was attributed to carrier confinement caused by potential fluctuation. This coincides well with the obtained activation energy at low temperature. We also present a model for transition from VSeto VInand to VCuwhich illustrates competing mechanisms between DAPs recombinations.

Original languageEnglish
Pages (from-to)A836-A842
JournalOptics Express
Issue number106
StatePublished - 05 11 2012
Externally publishedYes


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