期刊
ADVANCED FUNCTIONAL MATERIALS
卷 31, 期 8, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adfm.202008699
关键词
non‐ fullerene solar cell; solid additive; thermal stability; thickness insensitivity
类别
资金
- Foundation of National Natural Science Foundation of China (NSFC) [61421002, 61675041, 21674060, 51703019]
- Project of Science and Technology of Sichuan Province [2019YFG0121, 2019YJ0178, 2020YFG0279, 2020YFG0281]
- Office of Naval Research [N00014-17-1-2241]
- Sichuan Province Key Laboratory of Display Science and Technology
- Chinese Scholarship Council [201806070051]
This research successfully demonstrated the use of multifunctional solid additive BP-BP in non-fullerene acceptor polymer solar cells, improving device efficiency and stability. Devices fabricated with BP-BP showed enhanced carrier transport, morphology, and exciton dissociation, leading to higher power conversion efficiency. This work provides a new strategy for the application of solid additives in NFA-PSCs, offering improved reproducibility, insensitivity to thickness, and enhanced thermal stability.
Simultaneously improving efficiency and stability is critical for the commercial application of non-fullerene acceptor polymer solar cells (NFA-PSCs). Multifunctional solid additives have been considered as a potential route to tune the morphology of the active layer and optimize performance. In this work, photoinitiator bifunctional bis-benzophenone (BP-BP) is used as a solid additive, replacing solvent additives, in the PBDB-T:ITIC NFA system. With the addition of BP-BP, the intermolecular pi-pi stacking of PBDB-T and morphology is improved, leading to more balanced carrier transport and more effective exciton dissociation. Devices fabricated with BP-BP show a power conversion efficiency (PCE) of 11.89%, with enhanced short-circuit current (J(sc)), and fill factor (FF). Devices optimized with BP-BP show excellent reproducibility, insensitivity to thickness, and an improved thermal stability under atmospheric conditions without encapsulation. This work provides a new strategy for the application of solid additives in NFA-PSCs.
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