Organic Additive Engineering to Grow High-Quality Inorganic CsPbX3 Perovskite Films for Efficient and Stable Solar Cells

Inorganic CsPbX3 (X: Br, I, or their mixture) perovskite solar cells have gained widespread attention due to their superior stability and the steadily increased conversion efficiency. Inorganic CsPbX3 perovskite for solar cell application are usually fabricated by the solution-processing method. The nature of solution-processing method and the rapid crystal growth of perovskite lead to the formation of a wide range of defects within CsPbX3 perovskite films, which deteriorate the performance and stability of CsPbX3 devices. Recently, organic additive engineering has been demonstrated to be an effective strategy for improving the perovskite quality. Herein, the recent progress of organic additive engineering to grow high-quality inorganic CsPbX3 perovskite films for high-performance solar cells is summarized. The role of organic additives in the formation of inorganic CsPbX3 perovskite films and their effect on the performance of corresponding perovskite solar cells are discussed. In addition, some issues of organic additive engineering that should be deeply understood are summarized, and the research trend on organic additive engineering for further improving the performance of CsPbX3 devices is suggested.