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Effects of PbCl2 addition to perovskite CH3NH3PbI3 precursor solutions on the photovoltaic properties were investigated. TiO2/ CH3NH3PbI31xClx-based photovoltaic devices were fabricated, and the microstructures of the devices were investigated by X-ray diffraction. The structure analysis indicated phase transformation of the perovskite structure from cubic to tetragonal system by chlorine (Cl)-doping. External and internal quantum efficiencies were improved by a small amount of Cl-doping, which resulted in improvement of the efficiencies of the devices. This would be due to preservation of the cubic CH3NH3PbI31xClx structure, and to expansion of energy gap and diffusion length of exitons by Cl-doping at the iodine sites.

Effects of chlorine addition to perovskite-type CH<sub>3</sub>NH<sub>3</sub>PbI<sub>3</sub> photovoltaic devices