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

Horie, M., Kettle, J., Yu, C.-Y., Majewski, L. A., Chang, S.-W., Kirkpatrick, J., Tuladhar, S. M., Nelson, J., 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:Articles
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Kettle, Dr Jeff
Authors: Horie, M., Kettle, J., Yu, C.-Y., Majewski, L. A., Chang, S.-W., Kirkpatrick, J., Tuladhar, S. M., Nelson, J., Saunders, B. R., and Turner, M. L.
College/School:College of Science and Engineering > School of Engineering > Electronics and Nanoscale Engineering
Journal Name:Journal of Materials Chemistry
Publisher:Royal Society of Chemistry
ISSN:0959-9428
ISSN (Online):1364-5501
Published Online:03 November 2011

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