Free-carrier dynamics and band tails in C u2ZnSn(Sx S e1-x)4: Evaluation of factors determining solar cell efficiency

Le Quang Phuong, Makoto Okano, Genki Yamashita, Masaya Nagai, Masaaki Ashida, Akira Nagaoka, Kenji Yoshino, Yoshihiko Kanemitsu

研究成果: Article

21 引用 (Scopus)

抜粋

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.

元の言語English
記事番号115204
ジャーナルPhysical Review B - Condensed Matter and Materials Physics
92
発行部数11
DOI
出版物ステータスPublished - 2015 9 9
外部発表Yes

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Electronic, Optical and Magnetic Materials

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