期刊
JOURNAL OF MATERIALS CHEMISTRY A
卷 9, 期 5, 页码 2857-2863出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/d0ta10649f
关键词
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资金
- National Natural Science Foundation of China [62074022, 62074149]
- Natural Science Foundation of Chongqing [cstc2018jszx-cyzdX0137]
- Chongqing Science Foundation for Distinguished Young Scholars [cstc2020jcyj-jq0112]
- Artificial Intelligence Key Project of Chongqing [cstc2017rgzn-zdyf0120]
- Venture & Innovation Support Program for Chongqing Overseas Returnees [cx2019107]
- Fundamental Research Funds for the Central Universities [2020CDJQY-A055]
- Youth Talent Support Program of Chongqing [CQYC2020058091]
The study introduces a novel volatile solid additive IC-FI to improve efficiency of small-molecule organic solar cells by enhancing molecular ordering and phase separation within the active layer, leading to increased charge transport and extraction.
Morphology control remains a major challenge for all-small-molecule organic solar cells (ASM OSCs), mainly reflecting in the elusive trade-off between the molecular ordering and phase separation of the active layer. In this study, a novel volatile solid additive IC-FI, namely dihalogenated 1,1-dicyanomethylene-3-indanone, whose chemical structure is analogous to the end-group moiety of the representative non-fullerene acceptor, has been prepared and applied in BTR-Cl:N3-based ASM OSCs. The intrinsic structural feature of IC-IF enables the self-assembly of N3 along with the enhanced intermixing between BTR-Cl and N3 in the subsequent thermal annealing process. This offers nano-scale phase separation with a predominant face-on oriented molecular packing in the blend film, thereby boosting the effective charge transport and extraction process in the device. Consequently, a superior power conversion efficiency (PCE) of 14.43% with an outstanding fill factor (FF) of 73.53% was achieved in the IC-FI processed device. These results indicate that the use of the volatile solid additive is a simple and practical strategy for the optimization of the small-molecule bulk-heterojunction morphology toward highly efficient ASM OSCs.
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