Key Laboratory of Green Printing, Institute of Chemistry, Chinese Academy of Sciences (ICCAS), Beijing Engineering Research Center of Nanomaterials for Green Printing Technology, Beijing National Laboratory of Molecular Sciences (BNLMS), Beijing, 100190, P. R. China.
Key Laboratory of Fluorine and Silicon for Energy Materials and Chemistry of Ministry of Education, College of Chemistry and Chemical Engineering, Jiangxi Normal University, 99 Ziyang Avenue, Nanchang, 330022, P. R. China.
Nat Commun. 2023 Mar 2;14(1):1204. doi: 10.1038/s41467-023-36938-7.
In a flexible perovskite solar cell, the bottom interface between perovskite and the electron-transporting layer is critical in determining its efficiency and reliability. High defect concentrations and crystalline film fracturing at the bottom interface substantially reduce the efficiency and operational stability. In this work, a liquid crystal elastomer interlayer is intercalated into a flexible device with the charge transfer channel toughened by the aligned mesogenic assembly. The molecular ordering is instantly locked upon photopolymerization of liquid crystalline diacrylate monomers and dithiol-terminated oligomers. The optimized charge collection and the minimized charge recombination at the interface boost the efficiency up to 23.26% and 22.10% for rigid and flexible devices, respectively. The liquid crystal elastomer-induced suppression of phase segregation endows the unencapsulated device maintaining >80% of the initial efficiency for 1570 h. Moreover, the aligned elastomer interlayer preserves the configuration integrity with remarkable repeatability and mechanical robustness, which enables the flexible device to retain 86% of its original efficiency after 5000 bending cycles. The flexible solar cell chips are further integrated into a wearable haptic device with microneedle-based arrays of sensors to demonstrate a pain sensation system in virtual reality.
在柔性钙钛矿太阳能电池中，钙钛矿与电子传输层之间的底部界面对于其效率和可靠性至关重要。底部界面处的高缺陷浓度和晶体膜断裂会大大降低效率和工作稳定性。在这项工作中，液晶弹性体层间夹层被插入到一个柔性器件中，通过排列的介晶组装来增强电荷转移通道的韧性。分子取向在液晶二丙烯酸酯单体和硫醇封端低聚物的光聚合作用下立即被锁定。优化的电荷收集和界面处最小的电荷复合使刚性和柔性器件的效率分别提高到 23.26%和 22.10%。液晶弹性体诱导的相分离抑制使未封装的器件在 1570 小时内保持初始效率的>80%。此外，排列的弹性体层间夹层保持了配置完整性，具有显著的可重复性和机械鲁棒性，使柔性器件在 5000 次弯曲循环后仍能保持其原始效率的 86%。柔性太阳能电池芯片进一步集成到带有基于微针传感器阵列的可穿戴触觉设备中，以在虚拟现实中展示疼痛感知系统。
