journal article·2023-09-08

Realizing 23.9% Flexible Perovskite Solar Cells via Alleviating the Residual Strain Induced by Delayed Heat Transfer

Xiaoxiao Wu, Guiying Xu, Fu Yang, Weijie Chen, Heyi Yang, Yunxiu Shen, Yeyong Wu, Haiyang Chen, Jiachen Xi, Xiaohua Tang, Qinrong Cheng, Yujin Chen, Xue-mei Ou, Yaowen Li, Yongfang Li

ACS Energy Letters· Volume 8· Issue 9
Publisher page

Abstract

Flexible perovskite solar cells (pero-SCs) have aroused widespread interest because of their unique advantages in lightweight and portable electronics applications. However, the delayed heat transfer caused by plastic substrates can severely affect the reaction activity and diffusivity of cations during perovskite growth, resulting in spatial composition inhomogeneity and residual strain in the perovskite film. Here, a cross-linker 4,5-(3-methyloxetane) dicarboxylate imidazole (MZ) is designed to regulate crystallization kinetics precisely for controlling composition distribution in perovskite films on plastic substrates. The MZ can coordinate with Pb 2+ to form a mesoporous scaffold of lead iodide film and increase the activation energy for perovskite crystal formation, which can inhibit cation reaction in the top region and accelerate their downward diffusion. Consequently, the compositional inhomogeneity and residual strain can be effectively alleviated. Finally, the 0.062 and 1.004 cm 2 flexible pero-SCs achieved record power conversion efficiencies of 23.94% (certified 23.57%) and 21.87% with enhanced operational and mechanical stability.
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Research context

OpenAlex topics: Perovskite Materials and Applications · Conducting polymers and applications

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Laboratory of Advanced Optoelectronic Materials, Suzhou Key Laboratory of Novel Semiconductor-optoelectronics Materials and Devices, College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou 215123, China

Suzhou Sunflex New Energy Co., Ltd., Suzhou 215100, China

Jiangsu Key Laboratory of Advanced Negative Carbon Technologies, Soochow University, Suzhou 215123, China

State and Local Joint Engineering Laboratory for Novel Functional Polymeric Materials, Jiangsu Key Laboratory of Advanced Functional Polymer Design and Application, College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou 215123, China

Beijing National Laboratory for Molecular Sciences; CAS Key Laboratory of Organic Solids, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China

Funding

Natural Science Research of Jiangsu Higher Education Institutions of China · Collaborative Innovation Center of Suzhou Nano Science and Technology · National Key Research and Development Program of China · National Postdoctoral Program for Innovative Talents · China Postdoctoral Science Foundation · National Natural Science Foundation of China · Priority Academic Program Development of Jiangsu Higher Education Institutions · Key Laboratory of Polymeric Materials Design and Synthesis for Biomedical Function, Soochow University

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