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We investigate and report here the air stability of air-processed mixed halide CH3NH3PbI3−xClx perovskite solar cells. The solar cells were prepared in planar heterojunction as well as mesoscopic structures using four perovskite precursors having different wt% concentrations, viz. 13.7, 17.5, 24.1 and 38.9 wt%. Compact TiO2 layer (TiO2-bl) was used as electron transport layer, whereas poly(3-hexylthiophene)...