Near IR sensitive Sn based perovskite solar cells with high current density reaching 30mA/cm2

Enhancing Jsc of solar cells consisting of mixed metal perovskite, MASn0.5Pb0.5I3 (SnPb PVK), is reported. The SnPb PVK was prepared from Pbt/SnL· mixture or SnI2(DMSO)2/PbI2(DMSO)2 mixture, where these PVK are abbreviated as SnPb-A PVK and SnPb-B PVK, respectively. Urbach energy's sharpness factor (σ) for SnPb-B PVK was 1.5 which was higher than 0.5 for SnPb-A PVK, suggesting that the SnPb-B PVK has less crystal disordering than the SnPb-A PVK. The Jsc of the SnPb-B PVK cell was improved to 30 mA/cm², compared to 20 mA/cm² for SnPb-A PVK cell. The carrier dynamics is discussed by transient spectroscopy studies.