期刊
ADVANCED MATERIALS
卷 30, 期 16, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adma.201707150
关键词
dithieno[3,2-b:2 ',3 '-d]pyrrol; high-performance organic solar cells; narrow bandgap; nonfullerene acceptors
类别
资金
- National Natural Science Foundation of China [51573077, 61675017]
- 333 Project to Cultivate High Level Talents in Jiangsu Province
- Six Talent Peaks Project in Jiangsu Province
- Jiangsu Province Natural Science Foundation for Distinguished Young Scholars [BK20130032]
- Fundamental Research Funds for the Central Universities [2017YJS191]
- Priority Academic Program Development of Jiangsu Higher Education Institutions
A new electron-rich central building block, 5,5,12,12-tetrakis(4-hexylphenyl)-indacenobis-(dithieno[3,2-b:2',3'-d]pyrrol) (INP), and two derivative nonfullerene acceptors (INPIC and INPIC-4F) are designed and synthesized. The two molecules reveal broad (600-900 nm) and strong absorption due to the satisfactory electron-donating ability of INP. Compared with its counterpart INPIC, fluorinated nonfullerene acceptor INPIC-4F exhibits a stronger near-infrared absorption with a narrower optical bandgap of 1.39 eV, an improved crystallinity with higher electron mobility, and down-shifted highest occupied molecular orbital and lowest unoccupied molecular orbital energy levels. Organic solar cells (OSCs) based on INPIC-4F exhibit a high power conversion efficiency (PCE) of 13.13% and a relatively low energy loss of 0.54 eV, which is among the highest efficiencies reported for binary OSCs in the literature. The results demonstrate the great potential of the new INP as an electron-donating building block for constructing high-performance nonfullerene acceptors for OSCs.
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