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<p>This work presents a self-powered visible photodetector using GaSe nanoflorets (NFs) on a SiO<sub>2</sub> substrate deposited with a chemical vapor deposition technique. The fabricated device demonstrates self-powered photodetection with an ultra-high responsivity of 1580&#xa0;mA/W, high detectivity of 4.41 × 10<sup>10</sup> Jones, and an ultra-low noise equivalent power of 3.06 × 10<sup>−13</sup> WHz<sup>−1/2</sup> under 625-nm light irradiation. In addition, the device also reached a high EQE of 5.5 × 10<sup>2</sup>% with a fast response speed of 34/35&#xa0;ms. The high surface-to-volume ratio of the GaSe NFs boosts their photodetection efficiency, which makes them ideal for self-powered visible photodetectors. Furthermore, the performance of the device remained remarkably consistent for 2&#xa0;months. This study paves the way for developing optoelectronic applications based on GaSe devices, which are capable of self-powering and exhibit high performance in visible-light photodetection.</p>

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Synthesis of GaSe nanoflorets for highly responsive and fast response self-powered visible photodetectors

  • 期刊论文

  • 发表日期：

    2025年4月7日

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  • Urvashi Varshney,
  • Anuj Sharma,
  • Govind Gupta

摘要

This work presents a self-powered visible photodetector using GaSe nanoflorets (NFs) on a SiO2 substrate deposited with a chemical vapor deposition technique. The fabricated device demonstrates self-powered photodetection with an ultra-high responsivity of 1580 mA/W, high detectivity of 4.41 × 1010 Jones, and an ultra-low noise equivalent power of 3.06 × 10−13 WHz−1/2 under 625-nm light irradiation. In addition, the device also reached a high EQE of 5.5 × 102% with a fast response speed of 34/35 ms. The high surface-to-volume ratio of the GaSe NFs boosts their photodetection efficiency, which makes them ideal for self-powered visible photodetectors. Furthermore, the performance of the device remained remarkably consistent for 2 months. This study paves the way for developing optoelectronic applications based on GaSe devices, which are capable of self-powering and exhibit high performance in visible-light photodetection.