Chiral-structured heterointerfaces enable durable perovskite solar cells

• 成果类型: Article
• 署名作者: Duan, Tianwei; You, Shuai; Chen, Min; Yu, Wenjian; Li, Yanyan; Guo, Peijun; Berry, Joseph J.; Luther, Joseph M.; Zhu, Kai; Zhou, Yuanyuan
• 署名单位: Hong Kong Baptist University; United States Department of Energy (DOE); National Renewable Energy Laboratory - USA; Yale University; Yale University; University of Colorado System; University of Colorado Boulder; University of Colorado System; University of Colorado Boulder; Hong Kong University of Science & Technology
• 刊物名称: SCIENCE
• ISSN/ISSBN: 0036-12861
• DOI: 10.1126/science.ado5172
• 发表日期: 2024-05-24
• 页码: 878-884
• 关键词: high-performance; efficient; CHALLENGES

摘要

Mechanical failure and chemical degradation of device heterointerfaces can strongly influence the long-term stability of perovskite solar cells (PSCs) under thermal cycling and damp heat conditions. We report chirality-mediated interfaces based on R-/S-methylbenzyl-ammonium between the perovskite absorber and electron-transport layer to create an elastic yet strong heterointerface with increased mechanical reliability. This interface harnesses enantiomer-controlled entropy to enhance tolerance to thermal cycling-induced fatigue and material degradation, and a heterochiral arrangement of organic cations leads to closer packing of benzene rings, which enhances chemical stability and charge transfer. The encapsulated PSCs showed retentions of 92% of power-conversion efficiency under a thermal cycling test (-40 degrees C to 85 degrees C; 200 cycles over 1200 hours) and 92% under a damp heat test (85% relative humidity; 85 degrees C; 600 hours).