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<p>Enhancing intermolecular interactions can reduce the band gap energy of organic molecules. Consequently, certain polycyclic aromatic hydrocarbons – typically wide-band-gap insulators – may undergo insulator-to-metal transitions under simple compression. This pressure-induced electronic transition could enable the transformation of non-metallic organic materials into states exhibiting intriguing electronic properties, including high-temperature superconductivity. Here we investigate a pressure-induced transition in dicoronylene (C<sub>48</sub>H<sub>20</sub>), an insulator at ambient conditions, to a semiconducting state with a resistivity drop of three-orders-of-magnitude at 23.0 GPa. Through the complementary integration of transport property measurements with in situ UV-Visible absorption, Raman spectroscopy and synchrotron X-ray diffraction experiments, as well as first-principles studies, we propose a possible mechanism for the pressure-driven electronic structure evolution of C<sub>48</sub>H<sub>20</sub>. The discovery of an intriguing electronic transition at pressures well below the megabar observed marks a promising step towards realizing a single-component purely hydrocarbon molecular metal.</p><p></p>

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Narrowing band gap chemically and physically: conductive dense hydrocarbon

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年5月15日

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  • Takeshi Nakagawa,
  • Caoshun Zhang,
  • Kejun Bu,
  • Philip Dalladay-Simpson,
  • Martina Vrankić,
  • Sarah Bolton,
  • Dominique Laniel,
  • Dong Wang,
  • Akun Liang,
  • Hirofumi Ishii,
  • Nozomu Hiraoka,
  • Gaston Garbarino,
  • Angelika D. Rosa,
  • Qingyang Hu,
  • Xujie Lü,
  • Ho-kwang Mao,
  • Yang Ding

摘要

Enhancing intermolecular interactions can reduce the band gap energy of organic molecules. Consequently, certain polycyclic aromatic hydrocarbons – typically wide-band-gap insulators – may undergo insulator-to-metal transitions under simple compression. This pressure-induced electronic transition could enable the transformation of non-metallic organic materials into states exhibiting intriguing electronic properties, including high-temperature superconductivity. Here we investigate a pressure-induced transition in dicoronylene (C48H20), an insulator at ambient conditions, to a semiconducting state with a resistivity drop of three-orders-of-magnitude at 23.0 GPa. Through the complementary integration of transport property measurements with in situ UV-Visible absorption, Raman spectroscopy and synchrotron X-ray diffraction experiments, as well as first-principles studies, we propose a possible mechanism for the pressure-driven electronic structure evolution of C48H20. The discovery of an intriguing electronic transition at pressures well below the megabar observed marks a promising step towards realizing a single-component purely hydrocarbon molecular metal.