Open-circuit Voltage Loss in CH[3]NH[3]SnI[3] Perovskite Solar Cells

Organic-¬inorganic perovskite solar cells based on tin halides exhibit a small open-circuit voltage (V[OC]) because of a large photon energy loss from band-gap energy, as large as 0.8¬1.0 eV. In this study, we discussed the origin of the V[OC] loss in CH[3]NH[3]SnI3-based devices by measuring the temperature dependence of V[OC]. As a result, we found that the large loss in V[OC] is mainly due to the surface recombination at the interface rather than the bulk recombination in the perovskites