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<p>Metallic charge transport of field-induced carriers can be observed in single-crystal silicon over a wide temperature range. Such behaviour is rare in undoped organic semiconductors but is beneficial for engineering devices with advanced performance. Here we report metallic charge transport in conjugated molecular bilayers down to 8 K with an electrical conductivity of up to 245 S cm<sup>−1</sup> and a Hall mobility larger than 100 cm<sup>2</sup> V<sup>−1</sup> s<sup>−1</sup> at 20 K. We use molecular-crystal bilayers of the organic semiconductor 2-decyl-7-phenyl-[1]benzothieno[3,2-<i>b</i>][1]benzothiophene. We infer that this transport behaviour originates from the phenyl bridge coupling between the two molecular layers, which suppresses molecular vibrations and weakens Coulomb interactions. We develop a controlled method for introducing defects, using which we observe a disorder-driven metal–insulator transition in the molecular crystal.</p>

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Metallic charge transport in conjugated molecular bilayers

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年1月20日

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  • Kuakua Lu,
  • Yun Li,
  • Qijing Wang,
  • Linlu Wu,
  • Xinglong Ren,
  • Xu Chen,
  • Luhao Liu,
  • Yating Li,
  • Xiaoming Xu,
  • Qingkai Zhang,
  • Di Wang,
  • Liqi Zhou,
  • Mingfei Xiao,
  • Sai Jiang,
  • Mengjiao Pei,
  • Haoxin Gong,
  • William Wood,
  • Ian E. Jacobs,
  • Junzhan Wang,
  • Gang Chen,
  • Peng Wang,
  • Zhaosheng Li,
  • Chunfeng Zhang,
  • Xinran Wang,
  • Xu Wu,
  • Yeliang Wang,
  • Wei Ji,
  • Songlin Li,
  • Jingsi Qiao,
  • Yi Shi,
  • Henning Sirringhaus

摘要

Metallic charge transport of field-induced carriers can be observed in single-crystal silicon over a wide temperature range. Such behaviour is rare in undoped organic semiconductors but is beneficial for engineering devices with advanced performance. Here we report metallic charge transport in conjugated molecular bilayers down to 8 K with an electrical conductivity of up to 245 S cm−1 and a Hall mobility larger than 100 cm2 V−1 s−1 at 20 K. We use molecular-crystal bilayers of the organic semiconductor 2-decyl-7-phenyl-[1]benzothieno[3,2-b][1]benzothiophene. We infer that this transport behaviour originates from the phenyl bridge coupling between the two molecular layers, which suppresses molecular vibrations and weakens Coulomb interactions. We develop a controlled method for introducing defects, using which we observe a disorder-driven metal–insulator transition in the molecular crystal.