Hydrazine-processed Ge-substituted CZTSe solar cells

Published

Journal Article

The p-type Cu2ZnSn(SxSe1-x)4 (with x ≈ 0; CZTSe) thin-film solar cell absorber, made from earth-abundant elements, was substituted with Ge using a hydrazine-based mixed particle-solution approach for the film deposition. The crystallographic unit cell parameters of the absorber layer decrease with gradual incorporation of Ge. A solar cell fabricated from a 40% Ge-substituted absorber showed a 9.1% power conversion efficiency, a higher open-circuit voltage, and a wider band gap compared with the device based on the unsubstituted absorber layer. This result shows the possibility of substituting, using the hydrazine-processing approach, the metal site of CZTSe with Ge for further device optimization. One area for further improvement in the substituted absorber layer devices includes reduction of a ZnSe secondary phase, which was apparent in the higher-Ge-content films. © 2012 American Chemical Society.

Full Text

Duke Authors

Cited Authors

  • Bag, S; Gunawan, O; Gokmen, T; Zhu, Y; Mitzi, DB

Published Date

  • December 11, 2012

Published In

Volume / Issue

  • 24 / 23

Start / End Page

  • 4588 - 4593

Electronic International Standard Serial Number (EISSN)

  • 1520-5002

International Standard Serial Number (ISSN)

  • 0897-4756

Digital Object Identifier (DOI)

  • 10.1021/cm302881g

Citation Source

  • Scopus