期刊
SOLAR RRL
卷 6, 期 6, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/solr.202101084
关键词
GISAXS; morphology; non-fullerene acceptors; organic solar cells; solvents
资金
- 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) [Mu 1487/22]
- Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) under Germany's Excellence Strategy [Mu 1487/22, EXC 2089/1 -390776260]
- TUM.solar
- Center for NanoScience (CeNS)
- China Scholarship Council (CSC)
- Hans Bockler Stiftung
- Erasmus Mundus MaMaSELF+ program
- Projekt DEAL
Non-fullerene acceptor (NFA)-based organic solar cells have shown significant progress in recent years. The choice of solvent for spin coating the active layers affects the film morphology and crystallinity. Among the compared chlorinated solvents (CB, chloroform, and dichlorobenzene), CB offers the best combination of small domain sizes, high number of edge-on crystallites, and small distances between neighboring domains. The smooth blend films obtained with CB have correlated roughness with the substrates and no large aggregates, leading to the highest power conversion efficiencies (PCEs).
Non-fullerene acceptor (NFA)-based organic solar cells have made tremendous progress in recent years. For the neat NFA system PBDB-T:ITIC, the film morphology and crystallinity are tailored by the choice of the solvent used for spin coating the active layers. Three different chlorinated solvents, chlorobenzene (CB), chloroform, and dichlorobenzene, are compared and the obtained active layer morphology is correlated with the optoelectronic properties and the device performance. The small domain sizes in the case of CB are most beneficial for the device performance, whereas the largest number or size of face-on PBDB-T crystallites is not causing the highest power conversion efficiencies (PCEs). In addition, when using CB, the number of edge-on crystallites is highest and the distances between neighboring domains are small. The smoothest blend films are realized with CB, which exhibit correlated roughness with their substrates and no large aggregates have formed in these blend films. Thus, CB offers the best way to balance the aggregation and crystallization kinetics in the active layer and enables the highest PCE values.
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