期刊
ADVANCED FUNCTIONAL MATERIALS
卷 31, 期 5, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adfm.202008494
关键词
all‐ polymer solar cells; complementary absorption; polymer acceptors; stability; ternary solar cells
类别
资金
- Shenzhen Basic Research Fund [JCYJ20180504165709042, JCYJ20170817105905899, JCYJ20190809162003662]
- China Postdoctoral Science Foundation [2019M662696]
- National Research Foundation (NRF) of Korea [NRF-2016M1A2A2940911, 2019R1A6A1A11044070]
- Center for Computational Science and Engineering at SUSTech
- National Research Foundation of Korea [4120200213669] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
Developing organic solar cells based on a ternary active layer is an effective approach to improve light harvesting, with recent advances showing significant progress in the field of all-polymer solar cells.
Developing organic solar cells (OSCs) based on a ternary active layer is one of the most effective approaches to maximize light harvesting and improve their photovoltaic performance. However, this strategy meets very limited success in all-polymer solar cells (all-PSCs) due to the scarcity of narrow bandgap polymer acceptors and the challenge of morphology optimization. In fact, the power conversion efficiencies (PCEs) of ternary all-PSCs even lag behind binary all-PSCs. Herein, highly efficient ternary all-PSCs are realized based on an ultranarrow bandgap (ultra-NBG) polymer acceptor DCNBT-TPC, a medium bandgap polymer donor PTB7-Th, and a wide bandgap polymer donor PBDB-T. The optimized ternary all-PSCs yield an excellent PCE of 12.1% with a remarkable short-circuit current density of 21.9 mA cm(-2). In fact, this PCE is the highest value reported for ternary all-PSCs and is much higher than those of the corresponding binary all-PSCs. Moreover, the optimized ternary all-PSCs show a photostability with approximate to 68% of the initial PCE retained after 400 h illumination, which is more stable than the binary all-PSCs. This work demonstrates that the utilization of a ternary all-polymer system based on ultra-NBG polymer acceptor blended with compatible polymer donors is an effective strategy to advance the field of all-PSCs.
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