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

• DOI: 10.1126/science.adi4531
• Publication Date: 2024-06-06T17:59:38Z
• Authors: Chengbin Fei; Anastasia Kuvayskaya; Xiaoqiang Shi; Mengru Wang; Zhifang Shi; Haoyang Jiao; Timothy J. Silverman; Michael Owen-Bellini; Yifan Dong; Yeming Xian; Rebecca Scheidt; Xiaoming Wang; Guang Yang; Hangyu Gu; Nengxu Li; Connor J. Dolan; Zhewen J. D. Deng; Deniz N. Cakan; David P. Fenning; Yanfa Yan; Matthew C. Beard; Laura T. Schelhas; Alan Sellinger; Jinsong Huang
• Keywords: Degradation; Ultraviolet

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