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Keywords:

  • mixed halides;
  • chlorine doping;
  • perovskite solar cells;
  • carrier lifetimes;
  • series resistance
Thumbnail image of graphical abstract

Solution-deposited-converted perovskite solar cells are studied by converting PbI2 planar 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.