Journal
JOURNAL OF MATERIALS CHEMISTRY
Volume 22, Issue 2, Pages 381-389Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c1jm12449h
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Funding
- EPSRC [EP/F056397/1]
- North West Development Agency
- National Science Council of Taiwan
- Engineering and Physical Sciences Research Council [EP/F056397/1] Funding Source: researchfish
- EPSRC [EP/F056397/1] Funding Source: UKRI
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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 (M-n > 100k) by oxidative polymerisation using iron(m)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) cm(2) 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.
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