A Novel Organic Phosphonate Additive Induced Stable and Efficient Perovskite Solar Cells with Efficiency over 24% Enabled by Synergetic Crystallization Promotion and Defect Passivation

• DOI: 10.1021/acs.nanolett.3c01769
• Publication Date: 2023-09-25T18:15:19Z
• Authors: Caidong Cheng; Yiguo Yao; Lei Li; Qiangqiang Zhao; Chenyang Zhang; Xiuzun Zhong; Qi Zhang; Yajun Gao; Kai Wang
• Keywords: Passivation; Carrier lifetime; Phosphonate; Crystal (programming language); Hysteresis

Defect passivation is crucial to enhancing the performance of perovskite solar cells (PSCs). In this study, we successfully synthesized a novel organic compound named DPPO, which consists double phosphonate group. Subsequently, incorporated DPPO into solution. The presence P═O group interacting with undercoordinated Pb2+ yielded film superior crystallinity, greater crystal orientation, and smoother surface. Additionally, addition can passivate defect states enhance upper layer energy level alignment, will improve carrier extraction prevent nonradiative recombination. Consequently, an impressive champion efficiency 24.24% was achieved minimized hysteresis. Furthermore, DPPO-modified PSCs exhibit enhanced durability when exposed ambient conditions, maintaining 95% initial for 1920 h at average relative humidity (RH) 30%.