Universal and versatile morphology engineering via hot fluorous solvent soaking for organic bulk heterojunction

Nature Communications

Xin Wang¹  Qinye Bao²  Jingsong Huang³  Yan Wang⁴  Tong Shan⁴  Hongliang Zhong⁴  Feng Liu⁴  Ming Zhang⁴  Yi Zhang⁴  Jinqiu Xu⁴  Ziyi Xie⁴  Qingyun Wei⁴  Liwei Chen⁵  Chun-Chao Chen⁶  Qi Chen⁷  Cheng Wang⁷ 

[1] Bruker (Beijing) Scientific Technology Co., Ltd, 100192, Beijing, China;Key Laboratory of Polar Materials and Devices, Department of Electronic Science, School of Physics and Electronic Science, East China Normal University, 200241, Shanghai, China;Oxford Suzhou Centre for Advanced Research (OSCAR), University of Oxford, 215123, Suzhou, China;School of Chemistry and Chemical Engineering, Frontiers Science Center for Transformative Molecules, and In-situ Center for Physical Sciences, Shanghai Jiao Tong University, 200240, Shanghai, China;School of Chemistry and Chemical Engineering, Frontiers Science Center for Transformative Molecules, and In-situ Center for Physical Sciences, Shanghai Jiao Tong University, 200240, Shanghai, China;i-Lab, CAS Center for Excellence in Nanoscience, Suzhou Institute of Nano-Tech and Nano-Bionics, Chinese Academy of Sciences, 215123, Suzhou, China;School of Materials Science and Engineering, Shanghai Jiao Tong University, 200240, Shanghai, China;i-Lab, CAS Center for Excellence in Nanoscience, Suzhou Institute of Nano-Tech and Nano-Bionics, Chinese Academy of Sciences, 215123, Suzhou, China;

DOI  :  10.1038/s41467-020-19429-x

来源: Springer

【 摘 要 】

After explosive growth of efficiency in organic solar cells (OSCs), achieving ideal morphology of bulk heterojunction remains crucial and challenging for advancing OSCs into consumer market. Herein, by utilizing the amphiphobic nature and temperature-dependent miscibility of fluorous solvent, hot fluorous solvent soaking method is developed to optimize the morphology with various donor/acceptor combinations including polymer/small-molecule, all-polymer and all-small-molecule systems. By immersing blend film into hot fluorous solvent which is utilized as liquid medium with better thermal conductivity, the molecular reorganization is accelerated. Furthermore, fluorous solvent can be miscible with the residue of chloroform and chloronaphthalene above upper critical solution temperature. This mixed solvent diffuses around inside the active layer and selectively promotes molecular reorganization, leading to optimized morphology. Compared to widely-used thermal annealing, this approach processed under mild conditions achieves superior photovoltaic performance, indicating the practicality and universality for morphological optimization in OSCs as well as other optoelectronic devices.

【 授权许可】

CC BY