4.4 Article

Isothianaphthene-Based Conjugated Polymers for Organic Photovoltaic Cells

Journal

MACROMOLECULAR CHEMISTRY AND PHYSICS
Volume 213, Issue 15, Pages 1596-1603

Publisher

WILEY-V C H VERLAG GMBH
DOI: 10.1002/macp.201200142

Keywords

DFT calculations; dihedral; isothianaphthene; organic photovoltaics; quinoidal polymers

Funding

  1. MOST [2012CB933401, 2011DFB50300]
  2. NSFC [50933003, 50902073, 50903044, 21004043]
  3. NSF of Tianjin City [10ZCGHHZ00600]

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Two novel copolymers PBDT-DEAITN and PBDT-DOAITN containing the same backbone of isothianaphthene (ITN) quinoidal and benzodithiophene (BDT) donor units are synthesized and their organic photovoltaic (OPV) devices are fabricated. Although these two polymers have rather low optical bandgaps, 1.52 and 1.58 eV for PBDT-DEAITN and PBDT-DOAITN, respectively, their OPV cells exhibit rather limited power conversion efficiencies of 1.25% and 1.20% under an AM1.5G simulated solar light. The reasons for the low OPV performance are investigated by structure modeling calculation. Based on this and the screening results for the representative quinoidal polymers in the literatures, a strategy of designing high- performance planar polymers based on ITN unit is proposed.

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