Interface band gap narrowing behind open circuit voltage losses in Cu${}_2$ZnSnS${}_4$ solar cells

Andrea Crovetto, Mattias Palsgaard, Tue Gunst +4

We present evidence that band gap narrowing at the heterointerface may be a major cause of the large open circuit voltage deficit of Cu${}_2$ZnSnS${}_4$/CdS solar cells. Band gap narro…