Wearable perovskite solar cells by aligned liquid crystal elastomers

Zengqi Huang, Lin Li (), Tingqing Wu, Tangyue Xue, Wei Sun, Qi Pan, Huadong Wang, Hongfei Xie, Jimei Chi, Teng Han, Xiaotian Hu, Meng Su (), Yiwang Chen () and Yanlin Song ()
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Zengqi Huang: Beijing National Laboratory of Molecular Sciences (BNLMS)
Lin Li: Suzhou University of Science and Technology
Tingqing Wu: Beijing National Laboratory of Molecular Sciences (BNLMS)
Tangyue Xue: Zhengzhou University
Wei Sun: Chinese Academy of Sciences (ISCAS)
Qi Pan: Beijing National Laboratory of Molecular Sciences (BNLMS)
Huadong Wang: Beijing National Laboratory of Molecular Sciences (BNLMS)
Hongfei Xie: Beijing National Laboratory of Molecular Sciences (BNLMS)
Jimei Chi: Beijing National Laboratory of Molecular Sciences (BNLMS)
Teng Han: Chinese Academy of Sciences (ISCAS)
Xiaotian Hu: Nanchang University
Meng Su: Beijing National Laboratory of Molecular Sciences (BNLMS)
Yiwang Chen: Jiangxi Normal University
Yanlin Song: Beijing National Laboratory of Molecular Sciences (BNLMS)

Nature Communications, 2023, vol. 14, issue 1, 1-11

Abstract: Abstract 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.

Date: 2023
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DOI: 10.1038/s41467-023-36938-7

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