期刊
JOURNAL OF MATERIALS CHEMISTRY A
卷 7, 期 45, 页码 25894-25899出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c9ta10145d
关键词
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资金
- National Key R&D Program of China [2017YFE0106000]
- National Natural Science Foundation of China [51773212, 21574144, 61705240, 21674123]
- Zhejiang Provincial Natural Science Foundation of China [LR16B040002]
- Ningbo Natural Science Foundation [2018A610137]
- Ningbo Municipal Science and Technology Innovative Research Team [2015B11002, 2016B10005]
- CAS Key Project of Frontier Science Research [QYZDB-SSW-SYS030]
- CAS Key Project of International Cooperation [174433KYSB20160065]
The introduction of a third component into the binary system to construct a ternary architecture is widely applied to improve the power conversion efficiency (PCE) of organic solar cells (OSCs). Herein, a small molecule donor, SM1, was introduced into the PM6:Y6 binary system where a high PCE of up to 16.55% was achieved after the addition of 15 wt% of SM1 in the donors with an open-circuit voltage (V-oc) of 0.831 V, a short-circuit current density (J(sc)) of 25.7 mA cm(-2), and a fill factor (FF) of 77.5%, which was much higher than that of the PM6:Y6 binary systems (15.75%), presenting a V-oc of 0.845 V, a J(sc) of 25.3 mA cm(-2), and a FF of 73.7%. The introduction of SM1 improved the charge extraction, exciton dissociation, and blend of the morphology while effectively reducing bimolecular recombination. As a result, the J(sc) and FF of the ternary devices greatly improved. This study presents an effective method to improve the PCE by adopting a ternary strategy, while at the same time, promoting a simple fabrication technology.
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