Boosting the efficiency and stability of two-step perovskite solar cells by a hydroxylamine-driven additive strategy†
Abstract
High quality perovskite films are commonly prepared using a two-step deposition method. However, residual PbI2 in perovskite solar cells is often associated with lower efficiency and poorer reproducibility. In this study, a multifunctional additive, N-Cbz-hydroxylamine (Cbz), is designed to enhance the quality of perovskite films. According to our results, Cbz effectively passivates defects by forming both hydrogen bonds and chemical linkages with PbI2 and FAI, reducing trap-state density, suppressing non-radiative recombination, and aligning energy levels. Consequently, the Cbz-based perovskite solar cells demonstrate significantly improved efficiency and stability by retaining 84% of their original efficiency after 3000 hours under ambient conditions. This work presents an effective strategy for producing high-quality perovskite films, enabling the development of high-performance perovskite solar cells.