Efficient and stable MAPbI3 perovskite solar cells via green anti-solvent diethyl carbonate

Organic-inorganic hybrid perovskite materials with distinctive optoelectronic properties have attracted much interest in the field of solar cells. As the light absorber, the quality of perovskite films is crucial to the perfor-mances of perovskite solar cells. Anti-solvent engineering seems to be an efficient method in preparing high -quality perovskite films, but mostly used anti-solvents are toxic, such as chlorobenzene (CB), which is harm-ful to the environmental protection. In the present work, we used the green anti-solvent diethyl carbonate (DEC) instead of CB, demonstrated that the DEC engineered CH3NH3PbI3 film exhibits improved morphology and crystallinity as well as reducing defects, which can be attributed to the interaction between DEC and the solvent dimethyl sulfoxide (DMSO). The DEC anti-solvent assisting yields efficient CH3NH3PbI3 perovskite solar cells with a champion power conversion efficiency of 20.20% and a steady state efficiency of 86% over a period of 20 days of storage under ambient conditions. The present study provides a viable path way to design green and effective perovskite solar cells in the future.