Optical designs that improve the efficiency of Cu2ZnSn(S,Se) 4 solar cells

Published

Journal Article

We present an optical-design approach that improves the short-circuit current and efficiency of Cu2ZnSn(S,Se)4 (CZTSSe) solar cells by tuning the thickness of the upper-device layers in order to maximize transmission into the CZTSSe absorber. The design approach combines optical modeling of idealized planar devices with a semi-empirical approach for treating the impact of surface roughness. Experimentally, we demonstrate that the new device architecture - which emphasizes thinner CdS and transparent-conducting layers - increases short-circuit current by about 10% in champion-caliber devices. These improvements are directly realized in the power-conversion efficiencies of CZTSSe devices, resulting in a certified improvement in the overall record power-conversion efficiency for CZTSSe from 11.1% to 12.0%. We also report comparable improvements for devices with band gaps in the range of 1.1-1.3 eV. © 2014 The Royal Society of Chemistry.

Full Text

Duke Authors

Cited Authors

  • Winkler, MT; Wang, W; Gunawan, O; Hovel, HJ; Todorov, TK; Mitzi, DB

Published Date

  • March 1, 2014

Published In

Volume / Issue

  • 7 / 3

Start / End Page

  • 1029 - 1036

Electronic International Standard Serial Number (EISSN)

  • 1754-5706

International Standard Serial Number (ISSN)

  • 1754-5692

Digital Object Identifier (DOI)

  • 10.1039/c3ee42541j

Citation Source

  • Scopus