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<p>We report the design and synthesis of two new donor–acceptor copolymers, PBDTT–TPD and PBDTSe–TPD, incorporating <i>N</i>-alkylthieno[3,4-c]pyrrole-4,6-dione (TPD) as the electron-acceptor unit benzo[1,2-b:4,5-b′]dithiophene (BDT) derivatives incorporating thiophene and selenophene as the electron-donor unit, respectively. To investigate the impact of substituting sulfur with selenium in the BDT core, we performed comprehensive structural, optical, and electrical characterizations. Compared to PBDTT–TPD, the selenophene-containing PBDTSe–TPD polymer exhibits a narrower optical bandgap, broader and red-shifted absorption spectra, and enhanced intermolecular interactions. As a result, the organic field-effect transistors (OFETs) fabricated with these polymers show hole mobilities of 0.0058 cm<sup>2</sup>/V·s or PBDTT–TPD and 0.021 cm<sup>2</sup>/V·s for PBDTSe–TPD. These results demonstrate that the strong quinoidal character and lower aromaticity of selenophene contribute to improved molecular packing and charge transport properties, highlighting its potential for high-performance organic electronic materials.</p> Graphical Abstract <p></p>

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Influence of selenophene substitution in BDT-based copolymers on molecular packing and charge transport

  • 期刊论文

  • 发表日期：

    2025年9月26日

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  • Changwoo Park,
  • Muhamad Kiki Afindia Joenata,
  • Jongkwang Park,
  • Soon-Ki Kwon,
  • Hyojung Cha,
  • Yun-Hi Kim

摘要

We report the design and synthesis of two new donor–acceptor copolymers, PBDTT–TPD and PBDTSe–TPD, incorporating N-alkylthieno[3,4-c]pyrrole-4,6-dione (TPD) as the electron-acceptor unit benzo[1,2-b:4,5-b′]dithiophene (BDT) derivatives incorporating thiophene and selenophene as the electron-donor unit, respectively. To investigate the impact of substituting sulfur with selenium in the BDT core, we performed comprehensive structural, optical, and electrical characterizations. Compared to PBDTT–TPD, the selenophene-containing PBDTSe–TPD polymer exhibits a narrower optical bandgap, broader and red-shifted absorption spectra, and enhanced intermolecular interactions. As a result, the organic field-effect transistors (OFETs) fabricated with these polymers show hole mobilities of 0.0058 cm2/V·s or PBDTT–TPD and 0.021 cm2/V·s for PBDTSe–TPD. These results demonstrate that the strong quinoidal character and lower aromaticity of selenophene contribute to improved molecular packing and charge transport properties, highlighting its potential for high-performance organic electronic materials.

Graphical Abstract