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Cross-sections of a hole-conductor-free CH 3 NH 3 PbI 3  perovskite solar cell were characterized with Kelvin probe force microscopy. A depletion region width of about 45 nm was determined from the measured potential profiles at the interface between CH 3 NH 3 PbI 3  and nanocrystalline TiO 2 , whereas a negligible depletion was measured at the CH 3 NH 3 PbI 3 /Al 2 O 3  interface. A complete solar cell can be realized with the CH 3 NH 3 PbI 3  that functions both as light harvester and hole conductor in combination with a metal oxide. The band diagrams were estimated from the measured potential profile at the interfaces, and are critical findings for a better understanding and further improvement of perovskite based solar cells.

The electronic structure of metal oxide/organo metal halide perovskite junctions in perovskite based solar cells