To deposit uniform CH3NH3PbI3-xClx (MAPbI(3-x)Cl(x)) mixed halide perovskite film reproducibly, we separated the conventional process to formation of MAPbI(3-x)Cl(x) mixed halide perovskite powder by heat-treatment process and deposition of MAPbI(3-x)Cl(x) mixed halide perovskite film by single step spin coating. The deviation of power conversion efficiency of MAPbI(3-x)Cl(x) mixed halide perovskite solar cells prepared by currently proposed method and conventional method was 13.75 +/- 0.88% and 8.02 +/- 1.65%, respectively, because more uniform MAPbI(3-x)Cl(x) mixed halide perovskite film could be reproducibly formed by separating the formation process of mixed halide perovskite powder and the single step spin coating process. (C) 2016 Elsevier B.V. All rights reserved.