Photocarrier localization and recombination dynamics in Cu 2ZnSnS4 single crystals

Le Quang Phuong, Makoto Okano, Yasuhiro Yamada, Akira Nagaoka, Kenji Yoshino, Yoshihiko Kanemitsu

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32 Citations (Scopus)

Abstract

We have studied the photocarrier localization and recombination dynamics in Cu2ZnSnS4 single crystals at room temperature. The band-gap energy and tail states below the band edge were evaluated by a combination of photoluminescence (PL), PL excitation, photocurrent, and femtosecond transient reflectivity spectroscopy. The photocarriers are rapidly localized to shallow tail states within a typical time constant of several picoseconds to a few tens of picoseconds. The sub-nanosecond PL decay dynamics indicate the importance of multiple carrier trapping processes in the shallow tail states. Therefore, it is concluded that the tail states dominate the optical responses of Cu2ZnSnS4 single crystals.

Original languageEnglish
Article number191902
JournalApplied Physics Letters
Volume103
Issue number19
DOIs
Publication statusPublished - 2013 Nov 4
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

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    Quang Phuong, L., Okano, M., Yamada, Y., Nagaoka, A., Yoshino, K., & Kanemitsu, Y. (2013). Photocarrier localization and recombination dynamics in Cu 2ZnSnS4 single crystals. Applied Physics Letters, 103(19), [191902]. https://doi.org/10.1063/1.4829063