Why lead methylammonium tri-iodide perovskite-based solar cells require a mesoporous electron transporting scaffold (but not necessarily a hole conductor) Academic Article uri icon


  • CH3NH3PbI3-based solar cells were characterized with electron beam-induced current (EBIC) and compared to CH3NH3PbI3–x Cl x ones. A spatial map of charge separation efficiency in working cells shows pin structures for both thin film cells. Effective diffusion lengths, LD,(from EBIC profile) show that holes are extracted significantly more efficiently than electrons in CH3NH3PbI3, explaining why CH3NH3PbI3-based cells require mesoporous electron conductors, while CH3NH3PbI3–x Cl x ones, where LD values are comparable for both charge types, do not.

publication date

  • January 31, 2014