LAUSR

Abstract Optimizing the grain size of the perovskite crystals is a significant procedure for improving the device performance of the perovskite solar cells. This study applies a common antisolvent diethyl ether as solvent additive for MAPbI3 precursor solution. It reveals that the addition of diethyl ether can effectively influence the crystallization process. The grain size of MAPbI3 crystals increases with the increasing of diethyl ether ratio. As a result, light absorption property of the perovskite films are also modified corresponding to the quality of the perovskite layer. With an optimized ratio of 4% for diethyl ether, a maximum power conversion efficiency of 15.09% was achieved, which is improved by more than 20% compared to the control device.