Impact of dye end groups on acceptor–donor–acceptor type molecules for solution-processed photovoltaic cells

Guangrui He; Zhi Li; Xiangjian Wan; Yongsheng Liu; Jiaoyan Zhou; Guankui Long; Mingtao Zhang; Yongsheng Chen

doi:10.1039/C2JM30194F

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Journal of Materials Chemistry

Issue 18, 2012

Journal of Materials Chemistry was published between 1991 and 2012. From issue 1, 2013, it was replaced by three new journals: Journal of Materials Chemistry A, B and C

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Paper

Impact of dye end groups on acceptor–donor–acceptor type molecules for solution-processed photovoltaic cells

Guangrui He,^a Zhi Li,^a Xiangjian Wan,^a Yongsheng Liu,^a Jiaoyan Zhou,^a Guankui Long,^a Mingtao Zhang^b and Yongsheng Chen*^a

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Corresponding authors

Key Laboratory for Functional Polymer Materials and Centre for Nanoscale Science and Technology, Institute of Polymer Chemistry, College of Chemistry Nankai University, Tianjin 300071, China
E-mail: yschen99@nankai.edu.cn ;
Fax: +86-(22)-2349-9992

Computational Center for Molecular Science Nankai University, Tianjin 300071, China

J. Mater. Chem., 2012,22, 9173-9180

DOI: 10.1039/C2JM30194F
Received 11 Jan 2012, Accepted 10 Mar 2012
First published online 14 Mar 2012

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Two new oligothiophene derivatives of the acceptor–donor–acceptor type, incorporating double rhodanine or 1,3-dimethylpyrimidine-2,4,6(1H,3H,5H)-trione units as the terminal acceptor groups, D2R(8 + 2)7T and DTDMP7T, have been designed and synthesized for solution-processable small molecule BHJ solar cells. The impacts of these different end dye moieties on their optical, electrochemical properties, morphology, mobility and solar cell performance were studied. Both compounds exhibit broad and highly efficient solar absorption with low bandgaps of 1.70 and 1.62 eV for D2R(8 + 2)7T and DTDMP7T, respectively. The D2R(8 + 2)7T and DTDMP7T based BHJ solar cell devices achieved a PCE of 2.46% and 4.05%, respectively, under the illumination of AM.1.5, 100 mW cm⁻².