期刊
ADVANCED SCIENCE
卷 6, 期 2, 页码 -出版社
WILEY
DOI: 10.1002/advs.201801743
关键词
difluorobenzothiadiazole; high mobility polymers; high power conversion efficiencies; nonfullerene polymer solar cells; phthalimide
资金
- National Natural Science Foundation of China [61574077, 51573076]
- Shenzhen Basic Research Fund [JCYJ20170817105905899]
- Shenzhen Peacock Plan Project [KQTD20140630110339343]
- Shenzhen Key Lab funding [ZDSYS201505291525382]
- Basic Research Fund of Shenzhen City [JCYJ20170817104319061]
- China Postdoctoral Science Foundation [2018M631727]
- SUSTC Presidential Postdoctoral Fellowship
- National Key R&D Program of Strategic Advanced Electronic Materials [2016YFB0401100]
- NRF of Korea [2016M1A2A2940911, 2015M1A2A2057506]
Highly efficient nonfullerene polymer solar cells (PSCs) are developed based on two new phthalimide-based polymers phthalimide-difluorobenzothiadiazole (PhI-ffBT) and fluorinated phthalimide-ffBT (ffPhI-ffBT). Compared to all high-performance polymers reported, which are exclusively based on benzo[1,2-b:4,5-b']dithiophene (BDT), both PhI-ffBT and ffPhI-ffBT are BDT-free and feature a D-A(1)-D-A(2) type backbone. Incorporating a second acceptor unit difluorobenzothiadiazole leads to polymers with low-lying highest occupied molecular orbital levels (approximate to-5.6 eV) and a complementary absorption with the narrow bandgap nonfullerene acceptor IT-4F. Moreover, these BDT-free polymers show substantially higher hole mobilities than BDT-based polymers, which are beneficial to charge transport and extraction in solar cells. The PSCs containing difluorinated phthalimide-based polymer ffPhI-ffBT achieve a substantial PCE of 12.74% and a large V-oc of 0.94 V, and the PSCs containing phthalimide-based polymer PhI-ffBT show a further increased PCE of 13.31% with a higher J(sc) of 19.41 mA cm(-2) and a larger fill factor of 0.76. The 13.31% PCE is the highest value except the widely studied BDT-based polymers and is also the highest among all benzothiadiazole-based polymers. The results demonstrate that phthalimides are excellent building blocks for enabling donor polymers with the state-of-the-art performance in nonfullerene PSCs and the BDT is not necessary for constructing such donor polymers.
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