title: A-D-A Type Small Molecules Based on Boron Dipyrromethene for Solution-Processed Organic Solar Cells.
abstract: The unique properties of boron dipyrromethene (BODIPY) dyes including facile synthesis, high absorption coefficients, and delocalized molecular orbitals as well as excellent photochemical and thermal stability, make them promising as materials for organic solar cells. Accordingly, in this study three A-D-A structural small molecules of BDTT-BODIPY, FL-BODIPY, and TT-BODIPY have been synthesized, in which two BODIPY acceptor units are symmetrically conjugated to 4,8-bis(5-(2-ethylhexyl) thiophen-2-yl)benzo[1,2-b:4,5-b]dithiophene (BDTT), 9,9-dioctyl-9H-fluorene (FL), and thieno[3,2-b]thiophene (TT) donor cores, respectively. The manipulation of the structural parameters significantly improves the performances of the BHJ OSCs, which show power conversion efficiencies of 4.75%, 1.51%, and 1.67% based on [6,6]-phenyl C71 -butyric acid methyl ester (PC71 BM) as the acceptor material and BDTT-BODIPY, FL-BODIPY, and TT-BODIPY as the donor materials, respectively.
authors.affiliation: State Key Laboratory of Luminescent Materials and Devices, South China University of Technology, 381 Wushan Road, Guangzhou, 510640, P. R. China.
authors.forename: Liangang
authors.initials: L
authors.lastname: Xiao
authors.affiliation: Institute of Molecular Functional Materials, Department of Chemistry and Institute of Advanced Materials, Hong Kong Baptist University, Waterloo Road, Kowloon Tong, Hong Kong, P. R. China.
authors.forename: Hongda
authors.initials: H
authors.lastname: Wang
authors.affiliation: State Key Laboratory of Luminescent Materials and Devices, South China University of Technology, 381 Wushan Road, Guangzhou, 510640, P. R. China.
authors.forename: Ke
authors.initials: K
authors.lastname: Gao
authors.affiliation: State Key Laboratory of Luminescent Materials and Devices, South China University of Technology, 381 Wushan Road, Guangzhou, 510640, P. R. China.
authors.forename: Lisheng
authors.initials: L
authors.lastname: Li
authors.affiliation: State Key Laboratory of Luminescent Materials and Devices, South China University of Technology, 381 Wushan Road, Guangzhou, 510640, P. R. China.
authors.forename: Chang
authors.initials: C
authors.lastname: Liu
authors.affiliation: State Key Laboratory of Luminescent Materials and Devices, South China University of Technology, 381 Wushan Road, Guangzhou, 510640, P. R. China. chxbpeng@scut.edu.cn.
authors.forename: Xiaobin
authors.initials: X
authors.lastname: Peng
authors.affiliation: Institute of Molecular Functional Materials, Department of Chemistry and Institute of Advanced Materials, Hong Kong Baptist University, Waterloo Road, Kowloon Tong, Hong Kong, P. R. China.
authors.forename: Wai-Yeung
authors.initials: WY
authors.lastname: Wong
authors.affiliation: Institute of Molecular Functional Materials, Department of Chemistry and Institute of Advanced Materials, Hong Kong Baptist University, Waterloo Road, Kowloon Tong, Hong Kong, P. R. China.
authors.forename: Wai-Kwok
authors.initials: WK
authors.lastname: Wong
authors.affiliation: Institute of Molecular Functional Materials, Department of Chemistry and Institute of Advanced Materials, Hong Kong Baptist University, Waterloo Road, Kowloon Tong, Hong Kong, P. R. China. xjzhu@hkbu.edu.hk.
authors.forename: Xunjin
authors.initials: X
authors.lastname: Zhu
keywords: BODIPY; bulk heterojunction; donor-acceptor systems; small molecules; solar cells