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

研究成果: Article

19 被引用数 (Scopus)


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.

ジャーナルApplied Physics Letters
出版ステータスPublished - 2014 12 8

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

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