TY - JOUR
T1 - Free-carrier dynamics and band tails in C u2ZnSn(Sx S e1-x)4
T2 - Evaluation of factors determining solar cell efficiency
AU - Phuong, Le Quang
AU - Okano, Makoto
AU - Yamashita, Genki
AU - Nagai, Masaya
AU - Ashida, Masaaki
AU - Nagaoka, Akira
AU - Yoshino, Kenji
AU - Kanemitsu, Yoshihiko
N1 - Publisher Copyright:
© 2015 American Physical Society.
PY - 2015/9/9
Y1 - 2015/9/9
N2 - We investigated the composition-dependent photocarrier dynamics in Cu2ZnSn(SxSe1-x)4 (CZTSSe) single crystals using various types of steady-state and time-resolved optical spectroscopy. Photoluminescence spectroscopy shows that the band-tail states formed below the band edge decrease monotonically with increasing Se content. THz time-resolved spectroscopy clarifies that an increase in the Se content leads to a shorter lifetime of the free photocarriers. A trade-off between the composition-dependent band-tail density and the free-carrier lifetime occurs in CZTSSe single crystals. Our experimental results provide insights into the physics behind the low and composition-dependent conversion efficiency of CZTSSe-based solar cells.
AB - We investigated the composition-dependent photocarrier dynamics in Cu2ZnSn(SxSe1-x)4 (CZTSSe) single crystals using various types of steady-state and time-resolved optical spectroscopy. Photoluminescence spectroscopy shows that the band-tail states formed below the band edge decrease monotonically with increasing Se content. THz time-resolved spectroscopy clarifies that an increase in the Se content leads to a shorter lifetime of the free photocarriers. A trade-off between the composition-dependent band-tail density and the free-carrier lifetime occurs in CZTSSe single crystals. Our experimental results provide insights into the physics behind the low and composition-dependent conversion efficiency of CZTSSe-based solar cells.
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U2 - 10.1103/PhysRevB.92.115204
DO - 10.1103/PhysRevB.92.115204
M3 - Article
AN - SCOPUS:84942532125
SN - 1098-0121
VL - 92
JO - Physical Review B - Condensed Matter and Materials Physics
JF - Physical Review B - Condensed Matter and Materials Physics
IS - 11
M1 - 115204
ER -