Free-carrier dynamics and band tails in Cu2ZnSn(SxSe1-x)4: Evaluation of factors determining solar cell efficiency

Phuong Le Quang; Okano Makoto; Yamashita GenkiNagai MasayaAshida MasaakiNagaoka AkiraYoshino KenjiKanemitsu Yoshihiko

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Free-carrier dynamics and band tails in Cu2ZnSn(SxSe1-x)4: Evaluation of factors determining solar cell efficiency

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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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《Physical review, B. Condensed matter and materials physics》 |2015年第11期|共7页
作者
Phuong Le Quang; Okano Makoto; Yamashita GenkiNagai MasayaAshida MasaakiNagaoka AkiraYoshino KenjiKanemitsu Yoshihiko;
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作者单位

Kyoto Univ, Inst Chem Res, Kyoto 6110011, Japan;

Osaka Univ, Grad Sch Engn Sci, Osaka 5608531, Japan;

Kyoto Univ, Dept Mat Sci & Engn, Kyoto 6068501, JapanMiyazaki Univ, Dept Appl Phys & Elect Engn, Miyazaki 8892192, Japan;

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正文语种英语
中图分类物理学;
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Free-carrier dynamics and band tails in Cu2ZnSn(SxSe1-x)4: Evaluation of factors determining solar cell efficiency

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