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

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

Research output: Contribution to journalArticle

18 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 languageEnglish
Article number231902
JournalApplied Physics Letters
Volume105
Issue number23
DOIs
Publication statusPublished - 2014 Dec 8
Externally publishedYes

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single crystals
spectroscopy
reflectance
energy
absorption spectroscopy
pumps
life (durability)
probes
photons
decay
excitation

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

Cite this

Ultrafast free-carrier dynamics in Cu2ZnSnS4 single crystals studied using femtosecond time-resolved optical spectroscopy. / Phuong, L. Q.; Okano, Makoto; Yamada, Y.; Yamashita, G.; Morimoto, T.; Nagai, M.; Ashida, M.; Nagaoka, A.; Yoshino, K.; Kanemitsu, Y.

In: Applied Physics Letters, Vol. 105, No. 23, 231902, 08.12.2014.

Research output: Contribution to journalArticle

Phuong, LQ, Okano, M, Yamada, Y, Yamashita, G, Morimoto, T, Nagai, M, Ashida, M, Nagaoka, A, Yoshino, K & Kanemitsu, Y 2014, 'Ultrafast free-carrier dynamics in Cu2ZnSnS4 single crystals studied using femtosecond time-resolved optical spectroscopy', Applied Physics Letters, vol. 105, no. 23, 231902. https://doi.org/10.1063/1.4903802
Phuong, L. Q. ; Okano, Makoto ; Yamada, Y. ; Yamashita, G. ; Morimoto, T. ; Nagai, M. ; Ashida, M. ; Nagaoka, A. ; Yoshino, K. ; Kanemitsu, Y. / Ultrafast free-carrier dynamics in Cu2ZnSnS4 single crystals studied using femtosecond time-resolved optical spectroscopy. In: Applied Physics Letters. 2014 ; Vol. 105, No. 23.
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AU - Morimoto, T.

AU - Nagai, M.

AU - Ashida, M.

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