A‐D‐A Type Small Molecules Based on Boron Dipyrromethene for Solution‐Processed Organic Solar Cells |
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| Authors: | Liangang Xiao Dr Hongda Wang Ke Gao Dr Lisheng Li Chang Liu Prof Dr Xiaobin Peng Prof Dr Wai‐Yeung Wong Prof Dr Wai‐Kwok Wong Dr Xunjin Zhu |
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| Institution: | 1. State Key Laboratory of Luminescent Materials and Devices, South China University of Technology, Guangzhou, P. R. China;2. Institute of Molecular Functional Materials, Department of Chemistry and Institute of Advanced Materials, Hong Kong Baptist University, Hong Kong, P. R. China;3. (+852)?3411‐7048 |
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| 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)benzo1,2‐b:4,5‐b]dithiophene (BDTT), 9,9‐dioctyl‐9H‐fluorene (FL), and thieno3,2‐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 (PC71BM) as the acceptor material and BDTT‐BODIPY, FL‐BODIPY, and TT‐BODIPY as the donor materials, respectively. |
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| Keywords: | BODIPY bulk heterojunction donor– acceptor systems small molecules solar cells |
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