DFT investigation into the underperformance of sulfide materials in photovoltaic applications

Lee A. Burton, Yu Kumagai, Aron Walsh, Fumiyasu Oba

Research output: Contribution to journalArticlepeer-review

20 Scopus citations


Photoactive sulfide materials typically under-perform with respect to their theoretical maximum photovoltaic efficiency compared to other light absorbing solids. In an effort to reveal the underlying cause of this situation, we investigate several potential back contact metals for photovoltaic devices using the principles of band alignment; principles that have repeatedly shown to be of key importance in this field. Specifically, the sulfides SnS, CuInS2 and Cu2ZnSnS4 are studied in contact with the metals Mo, Sn, Ti, W and Zr and their common terminations. We also consider the stability with respect to interfacial chemical degradation and show that almost all systems used to date are likely to form interstitial two-dimensional metal disulfides at the heterojunction interface. The likely effects of these disulfide secondary phases are explored and the optimal configurations for each photoactive sulfide presented.

Original languageEnglish
Pages (from-to)9132-9140
Number of pages9
JournalJournal of Materials Chemistry A
Issue number19
StatePublished - 2017

Bibliographical note

Publisher Copyright:
© 2017 The Royal Society of Chemistry.


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