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We demonstrate that single crystals of methylammonium lead bromide (MAPbBr3)could be grown directly on vertically aligned carbon nanotube (VACNT) forests.The fast-growing MAPbBr3 single crystals engulfed the protogenetic inclusionsin the form of individual CNTs, thus resulting in a three-dimensionallyenlarged photosensitive interface. Photodetector devices were obtained,detecting low light intensities (~20 nW) from UV range to 550 nm. Moreover, aphotocurrent was recorded at zero external bias voltage which points to theplausible formation of a p-n junction resulting from interpenetration ofMAPbBr3 single crystals into the VACNT forest. This reveals that verticallyaligned CNTs can be used as electrodes in operationally stable perovskite-basedoptoelectronic devices and can serve as a versatile platform for futureselective electrode development.

Three-dimensionally Enlarged Photoelectrodes by a Protogenetic Inclusion of Vertically Aligned Carbon Nanotubes into CH3NH3PbBr3 Single Crystals