香港科技大学周圆圆团队报道了手性结构异质界面使钙钛矿太阳能电池具有耐用性。相关研究成果于2024年5月24日发表在《科学》。

器件异质界面的机械失效和化学降解会强烈影响钙钛矿太阳能电池（PSCs），在热循环和湿热条件下的长期稳定性。

研究人员报道了钙钛矿吸收体和电子传输层之间基于R-/S-甲基苄基铵的手性介导的界面，以产生具有增加的机械可靠性的弹性但强的异质界面。该界面利用对映体控制的熵来增强对热循环诱导的疲劳和材料降解的耐受性，有机阳离子的异手性排列导致苯环的紧密堆积，从而增强化学稳定性和电荷转移。

在热循环测试（40°C至85°C；1200小时内200次循环）下，封装的PSCs显示出92%的功率转换效率保持率，在湿热测试（85%相对湿度；85°C，600小时）下为92%。

附：英文原文

Title: Chiral-structured heterointerfaces enable durable perovskite solar cells

Author: Tianwei Duan, Shuai You, Min Chen, Wenjian Yu, Yanyan Li, Peijun Guo, Joseph J. Berry, Joseph M. Luther, Kai Zhu, Yuanyuan Zhou

Issue&Volume: 2024-05-24

Abstract: 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).

DOI: ado5172

Source: https://www.science.org/doi/10.1126/science.ado5172