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

Solution‐deposited‐converted perovskite solar cells are studied by converting PbI2 planar films into the phase pure, mixed‐halide perovskite (H3CNH3)PbI3‐x Clx . These solar cells exhibit very high photovoltaic performance and close to unity internal incident photon‐to‐electron conversion.

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