Improvement of minority-carrier lifetime in tin monosulfide via substrate engineering

TitleImprovement of minority-carrier lifetime in tin monosulfide via substrate engineering
Publication TypeBook Chapter
Year of Publication2016
AuthorsChakraborty, R, Steinmann, V, Hempel, M, Rekemeyer, P, Ofori-Okai, BK, Hartman, K, Youssef, A, Akey, A, Nelson, KA, Gradecak, S, Kong, J, Buonassisi, T
Book Title2016 Ieee 43rd Photovoltaic Specialists Conference (pvsc)
Pagination415 - 418
PublisherIeee
CityNew York
ISBN Number978-1-5090-2724-8
Keywordslayer, solar-cells
Abstract

Tin (II) monosulfide (SnS) is a promising Earth-abundant, non-toxic thin-film absorber due to its near-ideal optoelectronic properties and manufacturability, but low minority-carrier lifetimes limit SnS device efficiencies to below 5%. We employ electron beam-induced current measurements to deduce the effect of structural defects on bulk recombination in our champion thermally evaporated devices, and then use graphene substrates as a means to reduce detrimental structural defects. We demonstrate an improvement in the effective minority-carrier lifetime of SnS using a graphene substrate, suggesting that the use of substrates with van der Waals surface termination may provide a route toward higher-efficiency SnS-based devices.