A high-performance selenium nanoflake-based avalanche photodetector

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review

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Author(s)

  • Handa Liu
  • Han Zhang
  • Huide Wang
  • Jiajia Zha

Related Research Unit(s)

Detail(s)

Original languageEnglish
Article number171110
Journal / PublicationApplied Physics Letters
Volume125
Issue number17
Publication statusPublished - 21 Oct 2024

Abstract

Photodetectors are now indispensable in our daily lives, and there is a pressing need to explore new materials and mechanisms that can push the boundaries of device performance. Two-dimensional (2D) van der Waals (vdW) semiconductors have emerged recently as a promising material platform with exceptional optoelectronic properties, making them particularly suitable for high-performance photodetectors. However, photoinduced carrier generation in conventional 2D vdW photodetectors are usually limited, and new mechanisms need to be introduced to enhance device performance. Herein, we report a high-performance avalanche photodetector based on selenium (Se) nanoflakes. Our device achieves a high photoresponsivity (R) and specific detectivity (D*) of 361 A·W−1 and 2.4 × 1012 Jones, respectively. These figures of merit are two orders of magnitude higher than that in conventional Se photoconductive photodetectors. As a large bandgap vdW semiconductor, the Se channel allows the application of an extremely large bias voltage across it, and the resulting high electric field leads to the avalanche multiplication of carriers, which lays the groundwork for the improved device performance. © 2024 Author(s).

Research Area(s)

Citation Format(s)

A high-performance selenium nanoflake-based avalanche photodetector. / Liu, Handa; Huang, Haoxin; Xia, Yunpeng et al.
In: Applied Physics Letters, Vol. 125, No. 17, 171110, 21.10.2024.

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review