Band alignment in SnS thin-film solar cells: Possible origin of the low conversion efficiency

Tin sulfide is an attractive absorber material for low-cost thin-film solar cells. Despite the ideal physical properties of bulk SnS, the photovoltaic conversion efficiencies achieved in devices to date have been no greater than 2%. Assessment of the valence band energy of the stable orthorhombic ph...

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Veröffentlicht in:Applied physics letters 2013-04, Vol.102 (13)
Hauptverfasser: Burton, Lee A., Walsh, Aron
Format: Artikel
Sprache:eng
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Zusammenfassung:Tin sulfide is an attractive absorber material for low-cost thin-film solar cells. Despite the ideal physical properties of bulk SnS, the photovoltaic conversion efficiencies achieved in devices to date have been no greater than 2%. Assessment of the valence band energy of the stable orthorhombic phase of SnS reveals a low ionisation potential (4.7 eV) in comparison to typical absorber materials (CdTe, CuInSe2, and Cu2ZnSnS4). A band mis-alignment is therefore predicted with commonly used back contact and buffer layers. Alternative configurations are proposed that should improve device performance.
ISSN:0003-6951
1077-3118
DOI:10.1063/1.4801313