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Cyclopentadithiophene-benzothiadiazole oligomers and polymers; synthesis, characterisation, field-effect transistor and photovoltaic characteristics

Horie, M. and Kettle, J. and Yu, C-Y. and Majewski, L.A. and Chang, S-W. and Kirkpatrick, J. and Tuladhar, S.M. and Nelson, J. and Saunders, B.R. and Turner, M.L. (2012) Cyclopentadithiophene-benzothiadiazole oligomers and polymers; synthesis, characterisation, field-effect transistor and photovoltaic characteristics. Journal of Materials Chemistry, 22 ((2)). pp. 381-389. DOI: 10.1039/C1JM12449H

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Abstract

Conjugated oligomers with various ratios of cyclopentadithiophene (CPDT) to benzothiadiazole (BT) repeating units are reported. These oligomers can be polymerised to high molecular weight polymers (Mn > 100k) by oxidative polymerisation using iron(III)chloride. The electronic properties of these materials were examined by cyclic voltammetry and UV-vis spectroscopy and the results compared to those calculated using density functional theory (DFT). Polymers with optimum ratios of CPDT : BT (2 : 1) units show hole mobilities in excess of 10�2 cm2 V�1 s�1 as the active layer in organic field effect transistors (OFETs). Bulk heterojunction organic photovoltaic (OPV) devices of these polymers with PCBM as the electron acceptor show a power conversion efficiency of 2.1% when processed in the absence of any additives. The reported OFET performance is significantly higher than the parent PCPDTBT alternating copolymer (CPDT : BT = 1 : 1) and also shows a moderate improvement in OPV performance.

Item Type: Article
Subjects: Research Publications
Departments: College of Physical and Applied Sciences > School of Electronic Engineering
Date Deposited: 09 Dec 2014 16:55
Last Modified: 23 Sep 2015 03:15
ISSN: 0959-9428
URI: http://e.bangor.ac.uk/id/eprint/1469
Identification Number: DOI: 10.1039/C1JM12449H
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