Electronic versions


  • J.P. Kettle
  • M. Horie
  • J. Kettle
  • C.Y. Yu
  • L.A. Majewski
  • S.W. Chang
  • J. Kirkpatrick
  • S.M. Tuladhar
  • J. Nelson
  • B.R. Saunders
  • M.L. Turner
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.
Original languageEnglish
Pages (from-to)381-389
JournalJournal of Materials Chemistry
Issue number2
Publication statusPublished - 1 Feb 2012
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