Heating-induced aggregation control for efficient sequential-cast organic solar cells

作     者：Donghui Li Chuanhang Guo Xue Zhang Baocai Du Pang Wang Shili Cheng Jinlong Cai Hui Wang Dan Liu Huifeng Yao Jianhui Hou Tao Wang 

作者机构：School of Materials Science and EngineeringWuhan University of TechnologyWuhanChina State Key Laboratory of Polymer Physics and ChemistryBeijing National Laboratory for Molecular SciencesCAS Research/Education Center for Excellence in Molecular SciencesInstitute of ChemistryChinese Academy of SciencesBeijingChina University of Chinese Academy of SciencesBeijingChina 

出 版 物：《Aggregate》 (聚集体(英文))

年 卷 期：2022年第3卷第3期

页      面：19-26页

核心收录：

学科分类：080503[工学-材料加工工程] 08[工学] 0805[工学-材料科学与工程（可授工学、理学学位）] 0802[工学-机械工程] 080201[工学-机械制造及其自动化] 

基　　金：National Natural Science Foundation of China,Grant/Award Numbers:52073221,21774097 Fundamental Research Funds for the Central Universities of China,Grant/Award Numbers:WUT:2021III016JC,WUT:2020-YB-004 

主　　题：aggregation heating nonfullerene acceptors organic solar cells sequentialcast 

摘      要：The aggregation and morphology within the photoactive layer is of considerable significance to boost the power-conversion efficiency(PCE)of organic solar cells(OSCs).Herein,heating-induced aggregation control of nonfullerene acceptor BTPeC7 during sequential casting was *** large aggregates of BTP-eC7 can be significantly reduced by sequential casting of BTP-eC7 hot solution on the D18 fibrillar layer,and further eliminated by sequential casting of BTP-eC7 hot solution on the D18 fibrillar layer heated on hot substrate,leading to stronger faceonπ–πstacking and appropriate phase separation within the photoactive layer to promote exciton dissociation and charge *** maximum PCE of D18/BTPeC7 solar cells can be enhanced from 8.1%of room temperature casting to 15.9%of hot solution,hot-substrate casting,therefore demonstrates that heating-induced aggregation and sequential-casting strategies are a promising approach in improving the performance of OSCs employing nonfullerene acceptors with limited solubility or strong crystallization ability.