期刊
ADVANCED MATERIALS
卷 34, 期 20, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adma.202200907
关键词
asymmetric configuration; organic solar cells; thickness-tolerance; volatile solid; Y-series molecules
类别
资金
- Natural Science Foundation of Jiangsu Province [BK20200591]
- National Natural Science Foundation of China [62105129]
- Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) [EXC 2089/1 390776260]
- Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) via International Research Training Group 2022 Alberta/Technical University of Munich International Graduate School for Environmentally Responsible Functional Materials (ATUMS)
- TUM.solar
- Chinese Scholarship Council
- Analysis and Testing Center, NERC Biomass of Changzhou University, China
A novel process-aid solid (PAS) engineering with asymmetric configuration is proposed to improve the microphase separation and component distribution of organic solar cells, leading to enhanced exciton splitting and charge collection efficiency.
Volatile solids with symmetric pi-backbone are intensively implemented on manipulating the nanomorphology for improving the operability and stability of organic solar cells. However, due to the isotropic stacking, the announced solids with symmetric geometry cannot modify the microscopic phase separation and component distribution collaboratively, which will constrain the promotion of exciton splitting and charge collection efficiency. Inspired by the superiorities of asymmetric configuration, a novel process-aid solid (PAS) engineering is proposed. By coupling with BTP core unit in Y-series molecule, an asymmetric, volatile 1,3-dibromo-5-chlorobenzene solid can induce the anisotropic dipole direction, elevated dipole moment, and interlaminar interaction spontaneously. Due to the synergetic effects on the favorable phase separation and desired component distribution, the PAS-treated devices feature the evident improvement of exciton splitting, charge transport, and collection, accompanied by the suppressed trap-assisted recombination. Consequently, an impressive fill factor of 80.2% with maximum power conversion efficiency (PCE) of 18.5% in the PAS-treated device is achieved. More strikingly, the PAS-treated devices demonstrate a promising thickness-tolerance character, where a record PCE of 17.0% is yielded in PAS devices with a 300 nm thickness photoactive layer, which represents the highest PCE for thick-film organic solar cells.
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