Cyano substituted benzotriazole based polymers for use in organic solar cells

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Title: Cyano substituted benzotriazole based polymers for use in organic solar cells
Author(s): Casey, A
Green, JP
Shakya Tuladhar, P
Kirkus, M
Han, Y
Anthopoulos, TD
Heeney, MJ
Item Type: Journal Article
Abstract: A new synthetic route to the electron accepting di-cyano substituted benzo[d][1,2,3]triazole (BTz) monomer 2-(2-butyloctyl)-4,7-di(thiophen-2-yl)-2H-benzotriazole-5,6-dicarbonitrile (dTdCNBTz) is reported. The cyano substituents can be easily introduced to the BTz unit in one step via the nucleophilic aromatic substitution of the fluorine substituents of the fluorinated precursor 2-(2-butyloctyl)-4,7-di(thiophen-2-yl)-2H-benzotriazole-5,6-difluoro (dTdFBTz). Co-polymers were prepared with distannylated benzo[1,2-b:4,5-b′]dithiophene (BDT) monomers containing either 2-ethylhexylthienyl (T-EH) side chains or 2-butyloctylthienyl (T-BO) side chains via Stille coupling to yield the novel medium band gap polymers P1 and P2 respectively. Whilst the organic photovoltaic (OPV) performance of P1 was limited by a lack of solubility, the improved solubility of P2 resulted in promising device efficiencies of up to 6.9% in blends with PC61BM, with high open circuit voltages of 0.95 V.
Publication Date: 6-Mar-2017
Date of Acceptance: 5-Mar-2017
URI: http://hdl.handle.net/10044/1/45492
DOI: https://dx.doi.org/10.1039/C7TA00835J
ISSN: 2050-7496
Publisher: Royal Society of Chemistry
Start Page: 6465
End Page: 6470
Journal / Book Title: Journal of Materials Chemistry A
Volume: 5
Copyright Statement: This journal is © The Royal Society of Chemistry 2017. This is an open access article licensed under a Creative Commons Attribution 3.0 Unported Licence (https://creativecommons.org/licenses/by/3.0/)
Sponsor/Funder: British Council (UK)
Engineering and Physical Sciences Research Council
Funder's Grant Number: 173601536
EP/G037515/1
Keywords: Science & Technology
Physical Sciences
Technology
Chemistry, Physical
Energy & Fuels
Materials Science, Multidisciplinary
Chemistry
Materials Science
ENHANCED PHOTOVOLTAIC PERFORMANCE
CONJUGATED POLYMERS
MOLECULAR DESIGN
RATIONAL DESIGN
BENZOTHIADIAZOLE
BENZODITHIOPHENE
DERIVATIVES
ELECTRONICS
COPOLYMERS
ACCEPTORS
Publication Status: Published
Appears in Collections:Physics
Chemistry
Experimental Solid State
Faculty of Natural Sciences



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