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A low band-gap copolymer composed of thienyl substituted anthracene and diketopyrrolopyrrole compatible with multiple electron acceptors for high efficiency polymer solar cells

Cited 24 time in Web of Science Cited 24 time in Scopus
Authors
Jung, Jae Woong; Jo, Won Ho
Issue Date
2015
Publisher
The Royal Society of Chemistry
Citation
Polymer Chemistry, vol.6, pp. 4013-4019
Abstract
A low band-gap copolymer consisting of 9,10-thienyl-substituted anthracene (TA) as an electron-donating
unit and diketopyrrolopyrrole (DPP) as an electron-withdrawing unit has been synthesized and applied
to the donor material in polymer solar cells. The weak electron-donating characteristic of TA, which has
2-D extended conjugation by thiophene side groups, makes the copolymer exhibit a low-lying HOMO
level of −5.5 eV with a low band-gap of 1.65 eV, which affords both high photo-voltage and photocurrent
of the polymer solar cells. As a result, the solar cell device fabricated from the blend of the copolymer
and PC71BM exhibits a promising power conversion efficiency of 7.02% (VOC = 0.80 V, JSC =
13.1 mA cm−2
, FF = 0.67). Moreover, the polymer solar cell as fabricated from the blend of the copolymer
and di-perylene bisimide (di-PBI) as a non-fullerene electron acceptor exhibits a promising power conversion
efficiency of 4.23% with VOC = 0.77 V, JSC = 9.8 mA cm−2
, and FF = 0.56. This photovoltaic performance
of the copolymer not only demonstrates that the TA is a promising electron-donating building
block for a high performance low band-gap copolymer, but also the copolymer is compatible with both PC71BM and a non-fullerene acceptor for high efficiency polymer solar cells.
Language
English
URI
https://hdl.handle.net/10371/94773
DOI
https://doi.org/10.1039/c5py00358j
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College of Engineering/Engineering Practice School (공과대학/대학원)Dept. of Material Science and Engineering (재료공학부) Journal Papers (저널논문_재료공학부)
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