Self-assembly construction of a homojunction of Sn–Pb …
All-perovskite tandem solar cells (PTSCs) demonstrate higher power conversion efficiency (PCE) and lower levelized cost of electricity than single-junction perovskite solar cells (PSCs). However, narrow bandgap (NBG) sub-cells with a Sn–Pb alloy cause severe p-type self-doping by surface oxidized Sn4+ to gen