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DFT investigation into the underperformance of sulfide materials in photovoltaic applications

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Abstract

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.

Graphical abstract: DFT investigation into the underperformance of sulfide materials in photovoltaic applications

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Publication details

The article was received on 20 Jan 2017, accepted on 17 Apr 2017 and first published on 18 Apr 2017


Article type: Paper
DOI: 10.1039/C7TA00673J
Citation: J. Mater. Chem. A, 2017, Advance Article
  • Open access: Creative Commons BY license
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    DFT investigation into the underperformance of sulfide materials in photovoltaic applications

    L. A. Burton, Y. Kumagai, A. Walsh and F. Oba, J. Mater. Chem. A, 2017, Advance Article , DOI: 10.1039/C7TA00673J

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