Amidination of ligands for chemical and field-effect passivation stabilizes perovskite solar cells

• 成果类型: Article
• 署名作者: Yang, Yi; Chen, Hao; Liu, Cheng; Xu, Jian; Huang, Chuying; Malliakas, Christos D.; Wan, Haoyue; Bati, Abdulaziz S. R.; Wang, Zaiwei; Reynolds, Robert P.; Gilley, Isaiah W.; Kitade, Shuta; Wiggins, Taylor E.; Zeiske, Stefan; Suragtkhuu, Selengesuren; Batmunkh, Munkhbayar; Chen, Lin X.; Chen, Bin; Kanatzidis, Mercouri G.; Sargent, Edward H.
• 署名单位: Northwestern University; University of Toronto; Griffith University; United States Department of Energy (DOE); Argonne National Laboratory; Northwestern University
• 刊物名称: SCIENCE
• ISSN/ISSBN: 0036-10143
• DOI: 10.1126/science.adr2091
• 发表日期: 2024-11-22
• 页码: 898-902
• 关键词: efficient

摘要

Surface passivation has driven the rapid increase in the power conversion efficiency (PCE) of perovskite solar cells (PSCs). However, state-of-the-art surface passivation techniques rely on ammonium ligands that suffer deprotonation under light and thermal stress. We developed a library of amidinium ligands, of interest for their resonance effect-enhanced N-H bonds that may resist deprotonation, to increase the thermal stability of passivation layers on perovskite surfaces. This strategy resulted in a >10-fold reduction in the ligand deprotonation equilibrium constant and a twofold increase in the maintenance of photoluminescence quantum yield after aging at 85 degrees C under illumination in air. Implementing this approach, we achieved a certified quasi-steady-state PCE of 26.3% for inverted PSCs; and we report retention of >= 90% PCE after 1100 hours of continuous 1-sun maximum power point operation at 85 degrees C.