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<p>As a novel two-dimensional material, graphene has brought new opportunities for long-wave infrared (LWIR) photodetectors due to its unique optoelectronic, mechanical, chemical and thermal properties. Conventional planar graphene structures exhibit limited light absorption capabilities due to their inherent two-dimensional configuration. In this work, a self-driven LWIR photodetector Ag/[Si-NWs/rGO]/rGO/Au based on a novel hybrid architecture by integrating reduced graphene oxide (rGO) into the gaps of a silicon nanowires (Si-NWs) array to construct a three-dimensional light-trapping structure, is presented. Such a kind of innovative design significantly expands the photon absorption pathway in both lateral and vertical dimensions to enhance the photogenerated carriers’ extraction efficiency under LWIR light illumination. A remarkable specific detectivity (<i>D</i>*) of 1.59×10<sup>10</sup> and 5.02×10<sup>9</sup> Jones under 25 mW/cm<sup>2</sup> 11.5 and 14 µm illuminations, respectively, is obtained from photodetector Ag/[Si-NWs/rGO]/rGO/Au under zero-bias at room temperature, showing a significant breakthrough in achieving ultrahigh responsivity for LWIR detection at room-temperature. Further, the underlying mechanism behind the enhanced performance is explored in detail.</p>

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Synergistic absorption enhancement via silicon nanowires array wrapped with reduced graphene oxide for long-wave infrared, room-temperature self-driven photodetectors

  • 期刊论文

  • 发表日期：

    2026年5月27日

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  • Mingzhu Liu,
  • Shengyi Yang,
  • Guanzhen Zou,
  • Zhenhua Ge,
  • Mingdong Hong,
  • Haoran Bai,
  • Haiyuan Xin,
  • Bingsuo Zou,
  • Yurong Jiang

摘要

As a novel two-dimensional material, graphene has brought new opportunities for long-wave infrared (LWIR) photodetectors due to its unique optoelectronic, mechanical, chemical and thermal properties. Conventional planar graphene structures exhibit limited light absorption capabilities due to their inherent two-dimensional configuration. In this work, a self-driven LWIR photodetector Ag/[Si-NWs/rGO]/rGO/Au based on a novel hybrid architecture by integrating reduced graphene oxide (rGO) into the gaps of a silicon nanowires (Si-NWs) array to construct a three-dimensional light-trapping structure, is presented. Such a kind of innovative design significantly expands the photon absorption pathway in both lateral and vertical dimensions to enhance the photogenerated carriers’ extraction efficiency under LWIR light illumination. A remarkable specific detectivity (D*) of 1.59×1010 and 5.02×109 Jones under 25 mW/cm2 11.5 and 14 µm illuminations, respectively, is obtained from photodetector Ag/[Si-NWs/rGO]/rGO/Au under zero-bias at room temperature, showing a significant breakthrough in achieving ultrahigh responsivity for LWIR detection at room-temperature. Further, the underlying mechanism behind the enhanced performance is explored in detail.