Journal
JOURNAL OF MATERIALS CHEMISTRY C
Volume 7, Issue 2, Pages 314-323Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c8tc04746d
Keywords
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Funding
- Ministry of Science and Technology [2017YFA0206600, 2014CB643501]
- Natural Science Foundation of China [21875072, 21520102006, 91633301]
- Recruitment Program of Global Youth Experts of China
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In this work we report three novel polythiophene derivatives (P4T2F-HD, P4T2F-HD/BO, and P4T2F-BO) which are synthesized via a three-step reaction in each case. The polymers show excellent coplanarity and desired aggregation characteristics in solution. The HOMO energy levels of the new polymers were down-shifted by 0.4 eV as compared to the commercial polymer poly(3-hexylthiophene) (P3HT). The polymers are able to offer high device performance when combined with both fullerene and non-fullerene acceptors. When blended with a non-fullerene acceptor (5Z,5Z)-5,5-(((4,4,9,9-tetraoctyl-4,9-dihydro-s-indaceno[1,2-b:5,6-b]dithiophene-2,7-diyl)bis(benzo[c][1,2,5]thiadiazole-7,4-diyl))bis-(methanylylidene))bis(3-ethyl-2-thioxothiazolidin-4-one) (O-IDTBR), P4T2F-HD offers the highest PCE of 7.0% with a high V-oc of 1.04 V. Moreover, P4T2F-HD can tolerate the variation of active layer thickness over a large range when blended with a fullerene acceptor. The decent device performance and processability under mild conditions demonstrate that polythiophene derivatives hold great potential for application in large-scale production of polymer solar cell modules.
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