期刊
ACS ENERGY LETTERS
卷 4, 期 3, 页码 763-770出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsenergylett.9b00147
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资金
- National Natural Science Foundation of China [51573077, 21875111]
- Jiangsu Province Natural Science Foundation [BK20180496, BK20130032]
- 333 Project to Cultivate High Level Talents in Jiangsu Province
- Six Talent Peaks Project in Jiangsu Province
- Priority Academic Program Development of Jiangsu Higher Education Institutions
A narrow-band-gap molecular acceptor, IPIC-4Cl, featuring an indacenobis(dithieno[3,2-b:2',3'-d]pyrrol) (INP) core with 2-butyl-1-octyl side chains and chlorinated (dicyanomethylidene)-indan-1-one (IC) as electron-accepting end group, has been rationally designed as nonfullerene acceptors (NFAs) for organic solar cells (OSCs). The impact of chlorination on the acceptor unit is revealed by a comparison study with two counterpart NFAs bearing a fluorinated or nonhalogenated IC unit. The synergetic photophysical and morphological analyses reveal that PBDB-T:IPIC-4Cl blend possesses efficient exciton dissociation and charge collection integrated with higher crystallinity and optimized phase separation. Consequently, the OSCs constructed by PBDB-T:IPIC-4Cl obtain a champion power conversion efficiency (PCE) of 13.4% with an extremely low energy loss of 0.51 eV. More encouragingly, we achieve a higher photovoltaic performance of 14.3% for ternary solar cells by combining an optimal amount of PC71BM with PBDB-T:IPIC-4Cl blend.
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