Synthesis, characterization and photovoltaic properties of low band gap donor-acceptor polymers containing benzodithiophene donor unit with fluorenylthiophene as 2D-conjugated side for organic solar cell application

Two donor−acceptor low band gap polymers P1 (octyl as solubilizing group) and P2 (ethylhexyl as solubilizing group) containing fluorenylthiophene-substituted benzoditihiophene as an electron-rich unit and 3,6-bis(5-bromothiophen-2-yl)-2,5-bis(2-ethylhexyl)pyrrolo[3,4-c]pyrrole-1,4(2H,5H)-dione as an...

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Bibliographic Details
Published in:Molecular Crystals and Liquid Crystals 2016-08, Vol.635 (1), p.45-56
Main Authors: Kim, Taeik, Chakravarthi, Nallan, Kumarasamy, Gunasekar, Jin, Sung-Ho
Format: Article
Language:English
Subjects:
Band gap
benzodithiophene
Bulk heterojunction solar cells
Chemical synthesis
Conversion
Displays
Energy conversion efficiency
Esters
low-band gap polymers
Photovoltaic cells
Polymers
Shoulders
Solar cells
Solar energy
Synthesis (chemistry)
π-conjugated polymer
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Summary:Two donor−acceptor low band gap polymers P1 (octyl as solubilizing group) and P2 (ethylhexyl as solubilizing group) containing fluorenylthiophene-substituted benzoditihiophene as an electron-rich unit and 3,6-bis(5-bromothiophen-2-yl)-2,5-bis(2-ethylhexyl)pyrrolo[3,4-c]pyrrole-1,4(2H,5H)-dione as an electron-deficient unit are designed and synthesized for polymer solar cells application. Compared with P2 based on ethyl hexyl group, P1 with octyl group displays well resolved vibronic shoulder peak in absorption spectra, stronger intermolecular interactions, and higher hole mobility. Polymer solar cells based on P1 and [6,6]-phenyl-C 71 -butyric acid methyl ester (PC 71 BM) exhibit a maximum power conversion efficiency of 1.78% under AM 1.5G illumination (100 mW/cm 2 ).
ISSN:1542-1406
1563-5287
1527-1943
DOI:10.1080/15421406.2016.1199999