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Synthesis and photovoltaic properties of new donor-acceptor benzodithiophene-containing copolymers
Date
2013-05-01
Author
Keshtov, M. L.
Toppare, Levent Kamil
Marochkin, D. V.
Kochurov, V. S.
Parashchuk, D. Yu.
Trukhanov, V. A.
Khokhlov, A. R.
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Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License
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Four new alternating narrow band-gap copolymers containing benzodithiophene, 4,8-dithiophen-2-yl-benzo[1,2-c;4,5-c'-bis[1,2,5]thiadiazole, 4,9-bis(thiophen-2-yl)-6,7-di(2-ethylhexyl)-[1,2,5]thiadiazolo[3,4-g]quinoxaline, 5,8-dibromo-2,3-bis(5-octylthiophen-2-yl)quinoxaline, and 4,7-bis(5-bromothiophen-2-yl)benzo[1,2,5] thiadiazole units are synthesized under Stille reaction conditions. The structures, molecular masses, and physical properties of the copolymers are studied via H-1 NMR spectroscopy, GPC, cyclic voltammetry, and thermomechanical and thermogravimetric analyses. The polymers show solubility and a broad absorption region (with the band gap in the range from 0.81 to 1.53 eV). All of the polymers are photostable in air, and their levels of the highest occupied molecular orbital vary from -4.98 to -5.30 eV. Polymer solar cells based on these copolymers as donors and fullerene PC60BM as an acceptor show open-circuit voltages in the range 0.16-0.61 V, and the efficiencies of the devices are in the range 0.02-0.49%.
Subject Keywords
Materials Chemistry
,
Polymers and Plastics
,
Ceramics and Composites
URI
https://hdl.handle.net/11511/48621
Journal
POLYMER SCIENCE SERIES B
DOI
https://doi.org/10.1134/s1560090413060055
Collections
Department of Chemistry, Article