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CH3NH3PbI3-based solar cells were characterized with electron beam-inducedcurrent (EBIC), and compared to CH3NH3PbI3-xClx ones. A spatial map of chargeseparation efficiency in working cells shows p-i-n structures for both thinfilm cells. Effective diffusion lengths, LD, (from EBIC profile) show thatholes are extracted significantly more efficiently than electrons inCH3NH3PbI3, explaining why CH3NH3PbI3-based cells require mesoporous electronconductors, while CH3NH3PbI3-xClx ones, where LD values are comparable for bothcharge types, do not.

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Why Lead Methylammonium tri-IODIDE perovskite-based solar cells requires  a mesoporous electron transporting scaffold (but not necessarily a hole  conductor)