Ultrafast free-carrier dynamics in Cu{sub 2}ZnSnS{sub 4} single crystals studied using femtosecond time-resolved optical spectroscopy

Ultrafast free-carrier dynamics in Cu{sub 2}ZnSnS{sub 4} single crystals studied using femtosecond time-resolved optical spectroscopy

We studied the dynamics of photogenerated carriers in Cu{sub 2}ZnSnS{sub 4} (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 li...

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Veröffentlicht in:Applied physics letters 2014-12, Vol.105 (23)
Hauptverfasser: Phuong, L. Q., Kanemitsu, Y., Japan Science and Technology Agency, CREST, Uji, Kyoto 611-0011, Okano, M., Yamada, Y., Yamashita, G., Morimoto, T., Nagai, M., Ashida, M., Nagaoka, A., Department of Applied Physics and Electronic Engineering, University of Miyazaki, Miyazaki 889-2192, Yoshino, K.
Format: Artikel
Sprache:eng
Schlagworte:
ABSORPTION SPECTROSCOPY
CHARGE CARRIERS
CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
COPPER COMPOUNDS
ENERGY DEPENDENCE
EXCITATION
LIFETIME
MONOCRYSTALS
PHOTONS
PROBES
RECOMBINATION
REFLECTIVITY
RELAXATION
SURFACES
THZ RANGE
TIME RESOLUTION
TIN SULFIDES
TRANSIENTS
ZINC COMPOUNDS
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Zusammenfassung:We studied the dynamics of photogenerated carriers in Cu{sub 2}ZnSnS{sub 4} (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.
ISSN:0003-6951
1077-3118
DOI:10.1063/1.4903802