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

doi:10.1063/1.4919902

Individual identification of free hole and electron dynamics in CuIn_1-xGa_xSe₂ 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 journal › Article › peer-review

4 Citations (Scopus)

Abstract

The photocarrier dynamics of CuIn_1-xGa_xSe₂ (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 language	English
Article number	181903
Journal	Applied Physics Letters
Volume	106
Issue number	18
DOIs	https://doi.org/10.1063/1.4919902
Publication status	Published - 2015 May 4
Externally published	Yes

ASJC Scopus subject areas

Physics and Astronomy (miscellaneous)

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10.1063/1.4919902

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Individual identification of free hole and electron dynamics in CuIn_1-xGa_xSe₂ thin films by simultaneous monitoring of two optical transitions. / Okano, Makoto; Hagiya, Hideki; Sakurai, Takeaki; Akimoto, Katsuhiro; Shibata, Hajime; Niki, Shigeru; Kanemitsu, Yoshihiko.

In: Applied Physics Letters, Vol. 106, No. 18, 181903, 04.05.2015.

Research output: Contribution to journal › Article › peer-review

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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.",

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AU - Akimoto, Katsuhiro

AU - Shibata, Hajime

AU - Niki, Shigeru

AU - Kanemitsu, Yoshihiko

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Individual identification of free hole and electron dynamics in CuIn_1-xGa_xSe₂ thin films by simultaneous monitoring of two optical transitions

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