Solution Deposition‐Conversion for Planar Heterojunction Mixed Halide Perovskite Solar Cells

Solution-deposited-converted perovskite solar cells are studied by converting PbI2planar films into the phase pure, mixed-halide perovskite (H3CNH3)PbI3-xClx. These solar cells exhibit very high photovoltaic performance and close to unity internal incident photon-to-electron conversion.