4.8 Article

A tellurium short-wave infrared photodetector with fast response and high specific detectivity

Journal

NANOSCALE
Volume 14, Issue 36, Pages 13187-13191

Publisher

ROYAL SOC CHEMISTRY
DOI: 10.1039/d2nr02822k

Keywords

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Funding

  1. National Natural Science Foundation of China [11904001, 51971210, 51902001]
  2. Joint Funds of the National Natural Science Foundation of China and the Chinese Academy of Sciences Large-Scale Scientific Facility [U1932156]
  3. Natural Science Foundation of Anhui Province [2008085QA29]
  4. Pioneer Hundred Talents Program of the Chinese Academy of Sciences [E24BHD17]
  5. Open Research Fund of Advanced Laser Technology Laboratory of Anhui Province [AHL2020KF02]

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Hydrothermally synthesized 2D tellurium nanoflakes can be used for high-performance short-wave infrared photodetectors with high responsivity, fast rise and decay time, and high specific detectivity and external quantum efficiency.
Two-dimensional (2D) elementary tellurium (Te) has attracted intensive attention due to its potential applications in short-wave infrared photodetector devices. Here, we report hydrothermally synthesized 2D Te nanoflakes for short-wave infrared photodetectors with high performance. A Te-based photodetector exhibits a peak responsivity of 51.85 A W-1 at a 1550 nm wavelength, attributed to the efficient absorption of the phonons of 2D Te nanoflakes. Besides, the rising and decay time of the Te photodetector is calculated to be similar to 19 mu s and similar to 21 mu s, respectively, due to the rapid diffusion of charge carriers. In addition, Te-photodetectors exhibit a high specific detectivity (D*) of 1.88 x 10(10) Jones and a superior external quantum efficiency (EQE) of 4148%. Our findings have demonstrated the development of high-performance short-wave infrared photodetectors with fast responses based on 2D Te nanoflakes.

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