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<p>Polycrystalline diamond-based photodetectors exhibit significant potential for deep ultraviolet (UV) detection, yet their performance is constrained by grain boundary-induced carrier recombination and inefficient near-UV photon absorption.&#xa0;Here, we report a diamond/tungsten trioxide (WO<sub>3</sub>) heterostructure photodetector that achieves dual-band UV detection enhancement via synergistic band engineering. By integrating WO<sub>3</sub> onto polycrystalline diamond, the heterostructure overcomes intrinsic limitations of diamond devices. It exhibits a high specific detectivity of 6.16 × 10<sup>8</sup> Jones at 365&#xa0;nm, which is 21.7 times higher than diamond device. Moreover, it features fast photoresponse speed (0.72&#xa0;s) and ultralow photocurrent fluctuation (1.02%). Leveraging a Type-II band alignment, it achieves pronounced light/dark current ratios of 6.79 (222&#xa0;nm) and 78.17 (365&#xa0;nm). These values represent enhancements of 5.6-fold and 59.1-fold respectively, compared to pristine diamond. The practical viability of diamond/WO<sub>3</sub> heterostructure photodetector is validated through optical communication and high-resolution imaging. This work provides an effective strategy to construct high-performance diamond-based optoelectronic devices toward optical communication and imaging systems.</p>

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Diamond/WO3 heterostructure photodetector with enhanced UV photoresponse for optical communication and imaging applications

  • 期刊论文

  • 发表日期：

    2025年11月13日

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  • Hanning Xu,
  • Zitong Liu,
  • Longhai Shen,
  • Ouxiang Zhou,
  • Lijie Deng,
  • Junchao Wang,
  • Siyu Feng,
  • Lizhi Feng,
  • Baodan Liu,
  • Xin Jiang,
  • Xinglai Zhang

摘要

Polycrystalline diamond-based photodetectors exhibit significant potential for deep ultraviolet (UV) detection, yet their performance is constrained by grain boundary-induced carrier recombination and inefficient near-UV photon absorption. Here, we report a diamond/tungsten trioxide (WO3) heterostructure photodetector that achieves dual-band UV detection enhancement via synergistic band engineering. By integrating WO3 onto polycrystalline diamond, the heterostructure overcomes intrinsic limitations of diamond devices. It exhibits a high specific detectivity of 6.16 × 108 Jones at 365 nm, which is 21.7 times higher than diamond device. Moreover, it features fast photoresponse speed (0.72 s) and ultralow photocurrent fluctuation (1.02%). Leveraging a Type-II band alignment, it achieves pronounced light/dark current ratios of 6.79 (222 nm) and 78.17 (365 nm). These values represent enhancements of 5.6-fold and 59.1-fold respectively, compared to pristine diamond. The practical viability of diamond/WO3 heterostructure photodetector is validated through optical communication and high-resolution imaging. This work provides an effective strategy to construct high-performance diamond-based optoelectronic devices toward optical communication and imaging systems.