Phase‐Stable Wide‐Bandgap Perovskites for Four‐Terminal Perovskite/Silicon Tandem Solar Cells with Over 30% Efficiency (Small 38/2022)

Tandem Solar Cells Light-induced phase segregation is the chief culprit for the open-circuit voltage deficit and photo-instability in mix-halide perovskite solar cells with wide-bandgap. In article number 2203319, Xuegong Yu and co-workers report a highly efficient and photo-stable wide-bandgap perovskite solar cell with a top-ranking open-circuit voltage of 1.24 V realized by defects management in perovskite films via precursor solution engineering utilizing a low-cost additive of ammonium diethyldithiocarbamate. Integrated with a bottom silicon solar cell, a four-terminal tandem solar cell with a power conversion efficiency of 30.24% is achieved, which is one of the highest efficiencies in four-terminal perovskite/silicon tandem solar cells.