Optimized Photoelectric Performances via Composition Regulation of Precursor Solutions in CsPbI3 Perovskite Solar Cells

Abstract

Abstract The composition of precursor solutions always significantly impacts the morphology and properties of perovskite films, which plays an important role in the final performance of the solar cells. Here, PbI2 and DMAPbI3 were introduced in the CsPbI3 precursor solutions. The optimized composition and structure were realized by adjusting the content ratio of the two components. The optimum content ratio of PbI2 and DMAPbI3 was about 3:7, which results in a uniform film with optimized internal defects. Thus, the subsequent grain formation and growth process during the annealing process are better controlled. Finally, the obtained perovskite solar cells realized a power conversion efficiency (PCE) of 16.13%.