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.
Open-circuit voltage deficit in Cu2ZnSnS4 solar cells by interface bandgap narrowing
Ji-Sang Park, Sunghyun Kim, Samantha N. Hood, Aron Walsh; Open-circuit voltage deficit in Cu2ZnSnS4 solar cells by interface bandgap narrowing. Appl. Phys. Lett. 19 November 2018; 113 (21): 212103. https://doi.org/10.1063/1.5063793
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