Temperature-dependent photocarrier recombination dynamics in Cu 2ZnSnS4 single crystals

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

doi:10.1063/1.4866666

Temperature-dependent photocarrier recombination dynamics in Cu ₂ZnSnS₄ single crystals

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

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

26 Citations (Scopus)

Abstract

Time-resolved photoluminescence (PL) measurements have been used to study the temperature-dependent photocarrier recombination dynamics in Cu ₂ZnSnS₄ (CZTS) single crystals. We found a significant change of nearly four orders of magnitude of the PL decay time, from microseconds at low temperatures to subnanoseconds at room temperature. The slow PL decay at low temperatures indicates localization of the photocarriers at the band tails. Due to the large band tail states, the PL decay time depends strongly on both the photon energy and excitation density. It is pointed out that the drastically enhanced nonradiative recombination at high temperatures is one of the main factors that determine the power conversion efficiency of CZTS-based solar cells.

Original language	English
Article number	081907
Journal	Applied Physics Letters
Volume	104
Issue number	8
DOIs	https://doi.org/10.1063/1.4866666
Publication status	Published - 2014 Feb 24
Externally published	Yes

ASJC Scopus subject areas

Physics and Astronomy (miscellaneous)

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title = "Temperature-dependent photocarrier recombination dynamics in Cu 2ZnSnS4 single crystals",

abstract = "Time-resolved photoluminescence (PL) measurements have been used to study the temperature-dependent photocarrier recombination dynamics in Cu 2ZnSnS4 (CZTS) single crystals. We found a significant change of nearly four orders of magnitude of the PL decay time, from microseconds at low temperatures to subnanoseconds at room temperature. The slow PL decay at low temperatures indicates localization of the photocarriers at the band tails. Due to the large band tail states, the PL decay time depends strongly on both the photon energy and excitation density. It is pointed out that the drastically enhanced nonradiative recombination at high temperatures is one of the main factors that determine the power conversion efficiency of CZTS-based solar cells.",

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T1 - Temperature-dependent photocarrier recombination dynamics in Cu 2ZnSnS4 single crystals

AU - Phuong, Le Quang

AU - Okano, Makoto

AU - Yamada, Yasuhiro

AU - Nagaoka, Akira

AU - Yoshino, Kenji

AU - Kanemitsu, Yoshihiko

PY - 2014/2/24

Y1 - 2014/2/24

N2 - Time-resolved photoluminescence (PL) measurements have been used to study the temperature-dependent photocarrier recombination dynamics in Cu 2ZnSnS4 (CZTS) single crystals. We found a significant change of nearly four orders of magnitude of the PL decay time, from microseconds at low temperatures to subnanoseconds at room temperature. The slow PL decay at low temperatures indicates localization of the photocarriers at the band tails. Due to the large band tail states, the PL decay time depends strongly on both the photon energy and excitation density. It is pointed out that the drastically enhanced nonradiative recombination at high temperatures is one of the main factors that determine the power conversion efficiency of CZTS-based solar cells.

AB - Time-resolved photoluminescence (PL) measurements have been used to study the temperature-dependent photocarrier recombination dynamics in Cu 2ZnSnS4 (CZTS) single crystals. We found a significant change of nearly four orders of magnitude of the PL decay time, from microseconds at low temperatures to subnanoseconds at room temperature. The slow PL decay at low temperatures indicates localization of the photocarriers at the band tails. Due to the large band tail states, the PL decay time depends strongly on both the photon energy and excitation density. It is pointed out that the drastically enhanced nonradiative recombination at high temperatures is one of the main factors that determine the power conversion efficiency of CZTS-based solar cells.

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Temperature-dependent photocarrier recombination dynamics in Cu ₂ZnSnS₄ single crystals

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