Open-circuit voltage deficit in Cu₂ZnSnS₄ solar cells by interface bandgap narrowing Available to Purchase

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.