期刊
SOLAR RRL
卷 3, 期 7, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/solr.201900107
关键词
all-polymer solar cells; imide-functionalized polymers; n-type polymer semiconductors; organic electronics; structure-property relationships
资金
- National Science Foundation of China [51573076]
- Shenzhen Basic Research Fund [JCYJ20170817105905899]
- Shenzhen Peacock Plan Project [KQTD20140630110339343]
- Shenzhen Key Lab funding [ZDSYS201505291525382]
- NRF of Korea [2016M1A2A2940911, 2015M1A2A2057506]
Two triimide-functionalized n-type acceptor polymers are designed and synthesized, which show narrower bandgap, lower-lying frontier molecular orbital energy levels, and improved film morphology than the diimide-functionalized analogue polymers. When blended with a p-type donor polymer semiconductor PTB7-Th, an outstanding power conversion efficiency of 8.98% with a remarkable open-circuit voltage of 1.03 V is attained. This efficiency is among the highest values in all-polymer solar cells (all-PSCs) reported till today, surpassing that (6.85%) of the diimide-functionalized analogue polymers by a big margin and even higher than that (8.69%) of the fullerene-based solar cells. The results demonstrate that the triimide-functionalized f-BTI3 is an excellent building block for developing n-type polymer semiconductors, and the polymer f-BTI3-T is among the best-performing n-type polymers for applications in all-PSCs. The structure-property correlations of these imide-functionalized polymer semiconductors offer important guides for developing high-performance n-type polymer semiconductors.
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