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Polymerization generates chiral centers along the entire backbone of a polymer chain. Accordingly, the stereochemistry of the substituent group has a significant effect on polymer properties. Polymers formed from monosubstituted alkene monomers feature chiral carbons at every alternate position in the polymer backbone. Relative to the predominant orientation of substituents at the adjacent chiral carbons, the polymer can exist in three different configurations: isotactic, syndiotactic, and...
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Approaching disorder-tolerant semiconducting polymers.

Xinwen Yan1,2,3, Miao Xiong1,2, Xin-Yu Deng1

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Designing organic semiconductors with specific structures improves n-type doping efficiency and conductivity. This research offers a new concept for creating highly dopable and conductive polymeric semiconductors.

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Area of Science:

  • Materials Science
  • Organic Electronics
  • Polymer Chemistry

Background:

  • Doping controls charge carrier concentration in organic semiconductors.
  • N-doping in conjugated polymers is hindered by disorder from dopant distribution, limiting efficiency and mobility.

Purpose of the Study:

  • To design n-type conjugated polymers with enhanced tolerance to dopant-induced disorder.
  • To achieve high doping efficiency and charge carrier mobilities in n-type polymers.

Main Methods:

  • Screening of numerous polymer building block combinations.
  • Computational design focusing on backbone conformation, torsional barriers, and curvature.
  • Synthesis and characterization of diketopyrrolopyrrole (DPP)-based polymers.

Main Results:

  • A designed polymer with a planar backbone, high torsional barriers, and zigzag curvature showed high dopability.
  • The polymer tolerated dopant-induced disorder effectively.
  • Achieved high n-type electrical conductivities exceeding 120 S cm⁻¹.

Conclusions:

  • A polymer design strategy was developed to overcome dopant-induced disorder in n-type conjugated polymers.
  • This approach enables highly dopable and conductive polymeric semiconductors.
  • The findings pave the way for advanced organic electronic devices.