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

doi:10.1103/PhysRevB.89.195203

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 journal › Article › peer-review

22 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 language	English
Article number	195203
Journal	Physical Review B - Condensed Matter and Materials Physics
Volume	89
Issue number	19
DOIs	https://doi.org/10.1103/PhysRevB.89.195203
Publication status	Published - 2014 May 20
Externally published	Yes

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics

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10.1103/PhysRevB.89.195203

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Okano, M., Takabayashi, Y., Sakurai, T., Akimoto, K., Shibata, H., Niki, S., & Kanemitsu, Y. (2014). 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. Physical Review B - Condensed Matter and Materials Physics, 89(19), [195203]. https://doi.org/10.1103/PhysRevB.89.195203

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

In: Physical Review B - Condensed Matter and Materials Physics, Vol. 89, No. 19, 195203, 20.05.2014.

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

Okano, M, Takabayashi, Y, Sakurai, T, Akimoto, K, Shibata, H, Niki, S & Kanemitsu, Y 2014, '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', Physical Review B - Condensed Matter and Materials Physics, vol. 89, no. 19, 195203. https://doi.org/10.1103/PhysRevB.89.195203

Okano, Makoto ; Takabayashi, Yutaro ; Sakurai, Takeaki ; Akimoto, Katsuhiro ; Shibata, Hajime ; Niki, Shigeru ; Kanemitsu, Yoshihiko. / 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. In: Physical Review B - Condensed Matter and Materials Physics. 2014 ; Vol. 89, No. 19.

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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

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