Ultrafast free-carrier dynamics in Cu2ZnSnS4 single crystals studied using femtosecond time-resolved optical spectroscopy

L. Q. Phuong; M. Okano; Y. Yamada; G. Yamashita; T. Morimoto; M. Nagai; M. Ashida; A. Nagaoka; K. Yoshino; Y. Kanemitsu

doi:10.1063/1.4903802

Ultrafast free-carrier dynamics in Cu₂ZnSnS₄ single crystals studied using femtosecond time-resolved optical spectroscopy

L. Q. Phuong, M. Okano, Y. Yamada, G. Yamashita, T. Morimoto, M. Nagai, M. Ashida, A. Nagaoka, K. Yoshino, Y. Kanemitsu

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

23 Citations (Scopus)

Abstract

We studied the dynamics of photogenerated carriers in Cu₂ZnSnS₄ (CZTS) single crystals using femtosecond transient reflectivity (TR) and optical pump-THz probe transient absorption (THz- TA) spectroscopy. The TR and THz-TA decay dynamics consistently showed that free carriers have long lifetimes of up to a few nanoseconds. The excitation-photon-energy-dependent TR measurements revealed a slow picosecond energy relaxation of free carriers to the band edge in CZTS. The relaxation and recombination dynamics of free carriers were affected by nonradiative recombinations at the surface. Our results revealed a global feature of energy relaxation and recombination processes of free carriers in CZTS single crystals.

Original language	English
Article number	231902
Journal	Applied Physics Letters
Volume	105
Issue number	23
DOIs	https://doi.org/10.1063/1.4903802
Publication status	Published - 2014 Dec 8
Externally published	Yes

ASJC Scopus subject areas

Physics and Astronomy (miscellaneous)

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10.1063/1.4903802

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abstract = "We studied the dynamics of photogenerated carriers in Cu2ZnSnS4 (CZTS) single crystals using femtosecond transient reflectivity (TR) and optical pump-THz probe transient absorption (THz- TA) spectroscopy. The TR and THz-TA decay dynamics consistently showed that free carriers have long lifetimes of up to a few nanoseconds. The excitation-photon-energy-dependent TR measurements revealed a slow picosecond energy relaxation of free carriers to the band edge in CZTS. The relaxation and recombination dynamics of free carriers were affected by nonradiative recombinations at the surface. Our results revealed a global feature of energy relaxation and recombination processes of free carriers in CZTS single crystals.",

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AU - Phuong, L. Q.

AU - Okano, M.

AU - Yamada, Y.

AU - Yamashita, G.

AU - Morimoto, T.

AU - Nagai, M.

AU - Ashida, M.

AU - Nagaoka, A.

AU - Yoshino, K.

AU - Kanemitsu, Y.

PY - 2014/12/8

Y1 - 2014/12/8

N2 - We studied the dynamics of photogenerated carriers in Cu2ZnSnS4 (CZTS) single crystals using femtosecond transient reflectivity (TR) and optical pump-THz probe transient absorption (THz- TA) spectroscopy. The TR and THz-TA decay dynamics consistently showed that free carriers have long lifetimes of up to a few nanoseconds. The excitation-photon-energy-dependent TR measurements revealed a slow picosecond energy relaxation of free carriers to the band edge in CZTS. The relaxation and recombination dynamics of free carriers were affected by nonradiative recombinations at the surface. Our results revealed a global feature of energy relaxation and recombination processes of free carriers in CZTS single crystals.

AB - We studied the dynamics of photogenerated carriers in Cu2ZnSnS4 (CZTS) single crystals using femtosecond transient reflectivity (TR) and optical pump-THz probe transient absorption (THz- TA) spectroscopy. The TR and THz-TA decay dynamics consistently showed that free carriers have long lifetimes of up to a few nanoseconds. The excitation-photon-energy-dependent TR measurements revealed a slow picosecond energy relaxation of free carriers to the band edge in CZTS. The relaxation and recombination dynamics of free carriers were affected by nonradiative recombinations at the surface. Our results revealed a global feature of energy relaxation and recombination processes of free carriers in CZTS single crystals.

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Ultrafast free-carrier dynamics in Cu₂ZnSnS₄ single crystals studied using femtosecond time-resolved optical spectroscopy

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