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Near-infrared small molecule acceptors based on 4H-cyclopenta [1,2-b:5,4-b']dithiophene units for organic solar cells
Wang, Kaili1,2; Wei, Hongwei1; Li, Zhefeng1; Lu, Shirong2
2021-12-01
摘要Two small-molecule non-fullerene acceptors (NFAs) CPDT-Me-2Eh and CPDT-4Cl-2Eh based on 4H-cyclopenta [1,2-b:5,4-b '] dithiophene as the electron-donating unit 2-(5/6-methyl-3-oxo-2,3-dihydro-1H-inden-1-ylidene) malononitrile and 2-(5,6-dichloro-3-oxo-2,3-dihydro-1H-inden-1-ylidene)malononitrile as the end group respectively were developed. Compared with CPDT-Me-2Eh, CPDT-4Cl-2Eh possesses red-shift absorption spectrum, lower HOMO and LUMO energy level, and higher electron mobility. Non-fullerene polymer solar cells based on PBDB-T: CPDT-4Cl-2Eh gave a power conversion efficiency (PCE) of 7.52%, with a fill factor (FF) of 64.46%, and a short-circuit current (Jsc) of 16.90 mA/cm2. As contrast, the cell based on PBDB-T: CPDT-Me-2Eh got a PCE value of 4.39%. Our results indicate that the small molecule acceptor containing the CPDT core can effectively extend the absorption spectrum to the near-infrared (NIR) region by chlorination of the capping group. Our work provides an easy routine to broaden the field of new NIR NFAs with high PCE based on nonfullerene OSCs.
关键词Organic solar cell Non-fullerene Near-infrared A-D-A structure Easy synthesis Posttreatment
DOI10.1016/j.dyepig.2021.109801
发表期刊DYES AND PIGMENTS
ISSN0143-7208
卷号196页码:6
通讯作者Li, Zhefeng(zhefeng@cqu.edu.cn) ; Lu, Shirong(lushirong@cigit.ac.cn)
收录类别SCI
WOS记录号WOS:000696926100007
语种英语