Affiliation:
1. Center on Nanoenergy Research Guangxi Colleges and Universities Key Laboratory of Blue Energy and Systems Integration Carbon Peak and Neutrality Science and Technology Development Institute School of Physical Science & Technology Guangxi University Nanning 530004 China
2. Department of Applied Physics The Hong Kong Polytechnic University Hong Kong Kowloon 999077 China
3. Department of Chemical Engineering Pohang University of Science and Technology Pohang 37673 South Korea
4. College of Polymer Science and Engineering State Key Laboratory of Polymer Materials Engineering Sichuan University Chengdu 610065 China
5. State Key Laboratory of Featured Metal Materials and Life‐cycle Safety for Composite Structures Nanning 530004 China
Abstract
AbstractThe halogenated volatile solid additives can delicately optimize the active layer morphology of organic solar cells, improving the devices' performance, stability, and reproducibility. However, what type of intermolecular interaction occurs between the solid additives and the active layer and whether the interaction truly impacts the donor or acceptor remains debatable. Herein, the focus is on halogenated volatile solid additives with conjugated benzene rings and their influence on the morphology of the active layer composed of PM6:Y6 as they evaporated. The absorbance spectra exhibit apparent red‐shift features in Y6 absorption regions, while the donor part is unaffected. The theoretical calculation results reveal that the additives can stay between two Y6 molecules and form halogen bonds, affecting the π–π aggregation properties of Y6. As a result, the crystalline features of the active layer are altered, leading to increased charge carrier mobilities, extended charge carrier diffusion lengths, reduced bimolecular charge recombination, and thus the device performance. Especially when 1,3,5‐tri bromobenzene is used, a champion power conversion efficiency of 17.9% is attained, among the best‐performed organic solar cells comprising PM6:Y6. The findings shed light on theoretical and experimental guidelines for designing and developing volatile solid additives for highly efficient nonfullerene organic solar cells.
Funder
Natural Science Foundation of Guangxi Province
National Natural Science Foundation of China
Guangxi University
Hong Kong Polytechnic University
Subject
Electrochemistry,Condensed Matter Physics,Biomaterials,Electronic, Optical and Magnetic Materials
Cited by
5 articles.
订阅此论文施引文献
订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献