Semicrystalline D-A copolymers with different chain curvature for applications in polymer optoelectronic devices

Wonho Lee, Gi Hwan Kim, Seo Jin Ko, Seungjib Yum, Sungu Hwang, Shinuk Cho, Young Han Shin, Jin Young Kim, Han Young Woo

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73 Citations (Scopus)


Thiophene- and thienothiophene-based donor-acceptor (D-A) type semicrystalline copolymers with different backbone curvatures, PTBT14 and PTTBT14, were designed and synthesized. Both the polymers exhibit a nearly planar structure via noncovalent S···O and C-H···N attractive interactions, etc., in the polymer chain. PTTBT14 is linear, whereas PTBT14 is curved owing to ∼160° bond angle of the thiophene linkage. PTTBT14 showed the higher degree of interchain ordering with edge-on orientation, resulting in efficient charge transport (0.26 cm2 V-1 s-1 for PTTBT14 compared to 0.02 cm2 V-1 s-1 for PTBT14) in PFETs with remarkable morphological stability and no deterioration in device properties at temperatures up to 250 °C. On the other hand, the curved shape of PTBT14 attributed to its improved photovoltaic properties with a power conversion efficiency of 5.56%. The linear PTTBT14 showed much stronger self-interactions with negligible morphological changes and little miscibility with PC 61BM, showing the poor photovoltaic characteristics.

Original languageEnglish
Pages (from-to)1604-1612
Number of pages9
Issue number5
Publication statusPublished - 2014 Mar 11
Externally publishedYes


ASJC Scopus subject areas

  • Organic Chemistry
  • Polymers and Plastics
  • Inorganic Chemistry
  • Materials Chemistry

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