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Two organolead halide perovskite nanocrystals, CH(3)NH(3)PbBr(3) and CH(3)NH(3)PbI(3),
were found to efficiently sensitize TiO(2) for visible-light conversion in photoelectrochemical
cells. When self-assembled on mesoporous TiO(2) films, the nanocrystalline perovskites
exhibit strong band-gap absorptions as semiconductors. The CH(3)NH(3)PbI(3)-based
photocell with spectral sensitivity of up to 800 nm yielded a solar energy conversion
efficiency of 3.8%. The CH(3)NH(3)PbBr(3)-based cell showed a high photovoltage of
0.96 V with an external quantum conversion efficiency of 65%.