Cesium-Triiodide-Mediated Crystallization Regulation of Pure-Iodide Wide-Bandgap Perovskites Enables Perovskite-Silicon Tandem Solar Cells Exceeding 30% Efficiency
Pure-iodide wide-bandgap (WBG) perovskites (∼1.68 eV) featuring eliminated photoinduced halide segregation are compelling top-cell absorbers for perovskite-silicon tandem solar cells. However, their complex crystallization readily induces heterogeneous composition and structural defects, hindering performance improve...