Structural and elemental characterization of high efficiency Cu2ZnSnS4solar cells


Journal Article

We have carried out detailed microstructural studies of phase separation and grain boundary composition in Cu2ZnSnS4based solar cells. The absorber layer was fabricated by thermal evaporation followed by post high temperature annealing on hot plate. We show that inter-reactions between the bottom molybdenum and the Cu2ZnSnS4, besides triggering the formation of interfacial MoSx, results in the out-diffusion of Cu from the Cu2ZnSnS4layer. Phase separation of Cu2ZnSnS4into ZnS and a Cu-Sn-S compound is observed at the molybdenum- Cu2ZnSnS4interface, perhaps as a result of the compositional out-diffusion. Additionally, grain boundaries within the thermally evaporated absorber layer are found to be either Cu-rich or at the expected bulk composition. Such interfacial compound formation and grain boundary chemistry likely contributes to the lower than expected open circuit voltages observed for the Cu2ZnSnS4devices. © 2011 American Institute of Physics.

Full Text

Duke Authors

Cited Authors

  • Wang, K; Shin, B; Reuter, KB; Todorov, T; Mitzi, DB; Guha, S

Published Date

  • January 31, 2011

Published In

Volume / Issue

  • 98 / 5

International Standard Serial Number (ISSN)

  • 0003-6951

Digital Object Identifier (DOI)

  • 10.1063/1.3543621

Citation Source

  • Scopus