Strong-bonding hole-transport layers reduce ultraviolet degradation of perovskite solar cells

• 成果类型: Article
• 署名作者: Fei, Chengbin; Kuvayskaya, Anastasia; Shi, Xiaoqiang; Wang, Mengru; Shi, Zhifang; Jiao, Haoyang; Silverman, Timothy J.; Owen-Bellini, Michael; Dong, Yifan; Xian, Yeming; Scheidt, Rebecca; Wang, Xiaoming; Yang, Guang; Gu, Hangyu; Li, Nengxu; Dolan, Connor J.; Deng, Zhewen J. D.; Cakan, Deniz N.; Fenning, David P.; Yan, Yanfa; Beard, Matthew C.; Schelhas, Laura T.; Sellinger, Alan; Huang, Jinsong
• 署名单位: University of North Carolina; University of North Carolina Chapel Hill; University of North Carolina School of Medicine; Colorado School of Mines; United States Department of Energy (DOE); National Renewable Energy Laboratory - USA; United States Department of Energy (DOE); National Renewable Energy Laboratory - USA; University System of Ohio; University of Toledo; University of California System; University of California San Diego; University of North Carolina; University of North Carolina Chapel Hill; University of North Carolina School of Medicine
• 刊物名称: SCIENCE
• ISSN/ISSBN: 0036-10987
• DOI: 10.1126/science.adi4531
• 发表日期: 2024-06-07
• 关键词: efficient; interface

摘要

The light-emitting diodes (LEDs) used in indoor testing of perovskite solar cells do not expose them to the levels of ultraviolet (UV) radiation that they would receive in actual outdoor use. We report degradation mechanisms of p-i-n-structured perovskite solar cells under unfiltered sunlight and with LEDs. Weak chemical bonding between perovskites and polymer hole-transporting materials (HTMs) and transparent conducting oxides (TCOs) dominate the accelerated A-site cation migration, rather than direct degradation of HTMs. An aromatic phosphonic acid, [2-(9-ethyl-9H-carbazol-3-yl)ethyl]phosphonic acid (EtCz3EPA), enhanced bonding at the perovskite/HTM/TCO region with a phosphonic acid group bonded to TCOs and a nitrogen group interacting with lead in perovskites. A hybrid HTM of EtCz3EPA with strong hole-extraction polymers retained high efficiency and improved the UV stability of perovskite devices, and a champion perovskite minimodule-independently measured by the Perovskite PV Accelerator for Commercializing Technologies (PACT) center-retained operational efficiency of >16% after 29 weeks of outdoor testing.