Peng Zhongxiang, Xian Kaihu, Liu Junwei, Zhang Yaowen, Sun Xiaokang, Zhao Wenchao, Deng Yunfeng, Li Xiuhong, Yang Chunming, Bian Fenggang, Geng Yanhou, Ye Long
School of Materials Science & Engineering, Tianjin Key Laboratory of Molecular Optoelectronic Sciences, Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), Tianjin University, Tianjin, 300350, China.
Shanghai Synchrotron Radiation Facility, Shanghai Advanced Research Institute, Chinese Academy of Sciences, Shanghai, 201204, China.
Adv Mater. 2023 Jan;35(3):e2207884. doi: 10.1002/adma.202207884. Epub 2022 Dec 16.
The stretchability and stretch-induced structural evolution of organic solar cells (OSCs) are pivotal for their collapsible, portable, and wearable applications, and they are mainly affected by the complex morphology of active layers. Herein, a highly ductile conjugated polymer P(NDI2OD-T2) is incorporated into the active layers of high-efficiency OSCs based on nonfullerene small molecule acceptors to simultaneously investigate the morphological, mechanical, and photovoltaic properties and structural evolution under stretching of ternary blend films with various acceptor contents. The structural robustness of the blend films is indicated by their stretch-induced structural evolution, which is monitored in real-time by a combination of in situ wide/small angle X-ray scattering. It is found that adding the soft P(NDI2OD-T2) can enhance the stretchability and structural robustness of ternary blend films by more entangled chains and tie chains to dissipate strain. Furthermore, the stretchability of the ternary blends can be superbly predicted by a 3D equivalent box model. This work provides instructive insight and guidance for designing stretchable electronics and predicting the stretchability of multicomponent blends.
有机太阳能电池（OSCs）的拉伸性和拉伸诱导的结构演变对于其可折叠、便携和可穿戴应用至关重要，并且它们主要受活性层复杂形态的影响。在此，将一种高延展性的共轭聚合物P（NDI2OD-T2）掺入基于非富勒烯小分子受体的高效OSCs的活性层中，以同时研究具有不同受体含量的三元共混膜在拉伸下的形态、机械和光伏性能以及结构演变。共混膜的结构稳健性由其拉伸诱导的结构演变表明，通过原位宽/小角X射线散射相结合实时监测。发现添加柔软的P（NDI2OD-T2）可以通过更多的缠结链和连接链来耗散应变，从而提高三元共混膜的拉伸性和结构稳健性。此外，三元共混物的拉伸性可以通过三维等效盒模型得到出色的预测。这项工作为设计可拉伸电子器件和预测多组分共混物的拉伸性提供了有指导意义的见解和指导。
