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Open-Circuit Voltage Deficit in Cu2ZnSnS4 Solar Cells by Interface Band Gap Narrowing

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arxiv 1811.01867 v2 pith:ETC2IZXI submitted 2018-11-05 cond-mat.mtrl-sci

Ji-Sang Park , Sunghyun Kim , Samantha N. Hood , Aron Walsh This is my paper · ORCID
classification cond-mat.mtrl-sci
keywords interfacecu2znsns4deficitopen-circuitvoltagebandcellsrecombination
verification ladder T0 review T1 audit T2 compute T3 formal
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There is evidence that interface recombination in Cu2ZnSnS4 solar cells contributes to the open-circuit voltage deficit. Our hybrid density functional theory calculations suggest that electron-hole recombination at the Cu2ZnSnS4/CdS interface is caused by a deeper conduction band that slows electron extraction. In contrast, the bandgap is not narrowed for the Cu2ZnSnSe4/CdS interface, consistent with a lower open-circuit voltage deficit.

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