Syntheses and Properties of Random Copolymers Using Thienyl-Thieno-Indole and Bithiophene-Dicarboximide with Different Ratios

We synthesized random copolymers using 6-(2-thienyl)-4 H -thieno[3,2- b ]indole (TTI) and N -alkyl-2,2′-bithiophene-3,3′-dicarboximide (BTI) as the electron-rich and deficient units for the polymer solar cells (PSCs). Herein, by using different feed ratios of electron-deficient unit, the push-pull t...

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Bibliographic Details
Published in:Macromolecular research 2019, 27(5), , pp.470-475
Main Authors: Kim, Juae, Jeong, Ina, Lee, Jihoon, Park, Sung Heum, Suh, Hongsuk
Format: Article
Language:English
Subjects:
Absorptivity
Characterization and Evaluation of Materials
Chemistry
Chemistry and Materials Science
Complex Fluids and Microfluidics
Copolymers
Nanochemistry
Nanotechnology
Photons
Photovoltaic cells
Physical Chemistry
Polymer Sciences
Soft and Granular Matter
Solar cells
고분자공학
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Summary:We synthesized random copolymers using 6-(2-thienyl)-4 H -thieno[3,2- b ]indole (TTI) and N -alkyl-2,2′-bithiophene-3,3′-dicarboximide (BTI) as the electron-rich and deficient units for the polymer solar cells (PSCs). Herein, by using different feed ratios of electron-deficient unit, the push-pull type copolymers were synthesized by Stille polymerization of TTI, BTI and thiophene linkage. Out of the series PBTI3 with 7:3 ratio of TTI and BTI showed the highest molar absorption coefficient and mobility, which is favorable for efficiently harvesting solar photons and higher photo-induced carriers to improve the J SC . Among devices of synthesized copolymers, PBTI3 /PC 71 BM (1:2) (with 3% DIO additive) blend-based PSCs showed the best performance with a J SC of 6.78 mA/cm 2 , a V OC of 0.72 V, a FF of 0.54 and a PCE of 2.64%.
ISSN:1598-5032
2092-7673
DOI:10.1007/s13233-019-7067-7