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      Effect of chalcogens on electronic and photophysical properties of vinylene-based diketopyrrolopyrrole copolymers

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      Author
      Dhar, J.
      Mukhopadhay, T.
      Yaacobi-Gross, N.
      Anthopoulos, T. D.
      Salzner, U.
      Swaraj, S.
      Patil, S.
      Date
      2015
      Source Title
      Journal of Physical Chemistry B
      Print ISSN
      1520-6106
      Electronic ISSN
      1520-5207
      Publisher
      American Chemical Society
      Volume
      119
      Issue
      34
      Pages
      11307 - 11316
      Language
      English
      Type
      Article
      Item Usage Stats
      120
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      90
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      Abstract
      Three vinylene linked diketopyrrolopyrrole based donor−acceptor (D−A) copolymers have been synthesized with phenyl, thienyl, and selenyl units as donors. Optical and electronic properties were investigated with UV−vis absorption spectroscopy, cyclic voltammetry, near edge X-ray absorption spectroscopy, organic field effect transistor (OFET) measurements, and density functional theory (DFT) calculations. Optical and electrochemical band gaps decrease in the order phenyl, thienyl, and selenyl. Only phenyl-based polymers are nonplanar, but the main contributor to the larger band gap is electronic, not structural effects. Thienyl and selenyl polymers exhibit ambipolar charge transport but with higher hole than electron mobility. Experimental and theoretical results predict the selenyl system to have the best transport properties, but OFET measurements prove the thienyl system to be superior with p-channel mobility as high as 0.1 cm2 V−1 s −1.
      Keywords
      Cyclic voltammetry
      Electronic properties
      Energy gap
      Field effect transistors
      Hole mobility
      Organic field effect transistors
      Polymers
      Ultraviolet spectroscopy
      X ray absorption spectroscopy
      Ambipolar charge transports
      Chemical equations
      Diketopyrrolopyrroles
      Near edge x-ray absorption spectroscopies
      Optical and electronic properties
      Photophysical properties
      Structural effect
      UV-Vis absorption spectroscopy
      Density functional theory
      Permalink
      http://hdl.handle.net/11693/21192
      Published Version (Please cite this version)
      http://dx.doi.org/10.1021/acs.jpcb.5b03145
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