Chiral-structured heterointerfaces enable durable perovskite solar cells

作者：Tianwei Duan, Shuai You, Min Chen, Wenjian Yu, Yanyan Li, Peijun Guo, Joseph J. Berry, Joseph M. Luther, Kai Zhu, Yuanyuan Zhou · 发表于：Science · 年份：2024 · DOI：10.1126/science.ado5172 · 被引用次数：209 · 研究领域：Perovskite Materials and Applications、Conducting polymers and applications、Organic Electronics and Photovoltaics

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°C to 85°C; 200 cycles over 1200 hours) and 92% under a damp heat test (85% relative humidity; 85°C; 600 hours).