Isotype Heterojunction Solar Cells Using n-Type Sb2Se3 Thin Films

Theodore D.C. Hobson, Laurie J. Phillips, Oliver S. Hutter, Huw Shiel, Jack E.N. Swallow, Christopher N. Savory, Pabitra K. Nayak, Silvia Mariotti, Bhaskar Das, Leon Bowen, Leanne A.H. Jones, Thomas J. Featherstone, Matthew J. Smiles, Mark A. Farnworth, Guillaume Zoppi, Pardeep K. Thakur, Tien Lin Lee, Henry J. Snaith, Chris Leighton, David O. ScanlonVinod R. Dhanak, Ken Durose, Tim D. Veal, Jonathan D. Major

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The carrier-type of the emerging photovoltaic Sb2Se3 was evaluated for both thin films and bulk crystals via a range of complementary techniques. X-ray photoelectron spectroscopy (XPS), hot probe, Hall effect, and surface photovoltage spectroscopy showed films and crystals synthesized from the Sb2Se3 granulate material to be n-type with chlorine identified as an unintentional n-type dopant via secondary ion mass spectrometry analysis. The validity of chlorine as a dopant was confirmed by the synthesis of intrinsic crystals from metallic precursors and subsequent deliberate n-type doping by the addition of MgCl2. Chlorine was also shown to be a substitutional n-type shallow dopant by density functional theory calculations. TiO2/Sb2Se3 n-n isotype heterojunction solar cells with 7.3% efficiency are subsequently demonstrated, with band alignment analyzed via XPS.

Original languageEnglish (US)
Pages (from-to)2621-2630
Number of pages10
JournalChemistry of Materials
Issue number6
StatePublished - Mar 24 2020

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