Band tailing and efficiency limitation in kesterite solar cells


Journal Article

We demonstrate that a fundamental performance bottleneck for hydrazine processed kesterite Cu2ZnSn(S,Se)4 (CZTSSe) solar cells with efficiencies reaching above 11% can be the formation of band-edge tail states, which quantum efficiency and photoluminescence data indicate is roughly twice as severe as in higher-performing Cu(In,Ga)(S,Se)2 devices. Low temperature time-resolved photoluminescence data suggest that the enhanced tailing arises primarily from electrostatic potential fluctuations induced by strong compensation and facilitated by a lower CZTSSe dielectric constant. We discuss the implications of the band tails for the voltage deficit in these devices. © 2013 AIP Publishing LLC.

Full Text

Duke Authors

Cited Authors

  • Gokmen, T; Gunawan, O; Todorov, TK; Mitzi, DB

Published Date

  • September 2, 2013

Published In

Volume / Issue

  • 103 / 10

International Standard Serial Number (ISSN)

  • 0003-6951

Digital Object Identifier (DOI)

  • 10.1063/1.4820250

Citation Source

  • Scopus