Scholarlink

<p>Photon harvesting and conversion in semiconductors hold critical scientific and technological value due to their wide-ranging applications, including optoelectronics, renewable energy, and thermal management. However, the efficiency of optical-to-electrical energy conversion is fundamentally limited by the rapid relaxation of thermalized carriers. Here, we demonstrate a spatial confinement-controlled hot carrier dynamics in a T-shape lead selenide photo-thermoelectric device, which achieves a room temperature external quantum efficiency values exceeding unity. This enhancement arises from spatial confinement-induced local phonon scattering, which suppresses the optical-excited hot carrier relaxation. As a result, the T-shape lead selenide detector achieves a room temperature peak detectivity of 6.3 × 10<sup>10 </sup> cm Hz<sup>1/2</sup> W<sup>−1</sup> beyond thermoelectric theoretical limit. This work establishes a transformative pathway for achieving high-efficiency photodetection and energy conversion technologies.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Spatial confined hot carrier dynamics for beyond unity quantum efficiency detection

  • 期刊论文

  • 出版模式：

    开放获取

  • 发表日期：

    2025年8月20日

查看全文
  • Yu Wan,
  • Zhe Cheng,
  • Zhen Wang,
  • Jiapeng Hu,
  • Fang Zhong,
  • Kangmin Leng,
  • Mengchun Qiu,
  • Kuai Yu,
  • Li Wang,
  • Antoni Rogalski,
  • Qi Jie Wang,
  • Jianbin Xu,
  • Weida Hu,
  • Qisheng Wang

摘要

Photon harvesting and conversion in semiconductors hold critical scientific and technological value due to their wide-ranging applications, including optoelectronics, renewable energy, and thermal management. However, the efficiency of optical-to-electrical energy conversion is fundamentally limited by the rapid relaxation of thermalized carriers. Here, we demonstrate a spatial confinement-controlled hot carrier dynamics in a T-shape lead selenide photo-thermoelectric device, which achieves a room temperature external quantum efficiency values exceeding unity. This enhancement arises from spatial confinement-induced local phonon scattering, which suppresses the optical-excited hot carrier relaxation. As a result, the T-shape lead selenide detector achieves a room temperature peak detectivity of 6.3 × 1010  cm Hz1/2 W−1 beyond thermoelectric theoretical limit. This work establishes a transformative pathway for achieving high-efficiency photodetection and energy conversion technologies.