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Waveguide-Coupled Light Photodetector Based on Two-Dimensional Molybdenum Disulfide.

Daria Hlushchenko1,2, Jacek Olszewski2, Tadeusz Martynkien2

  • 1Łukasiewicz Research Network-PORT Polish Center for Technology Development, ul. Stabłowicka 147, 54-066 Wrocław, Poland.

ACS Applied Materials & Interfaces
|May 25, 2024
PubMed
Summary
This summary is machine-generated.

We developed a novel photodetector by integrating molybdenum disulfide (MoS2) with a sol-gel silicon dioxide:titanium dioxide optical waveguide. This device efficiently detects visible light, showing promise for optoelectronics.

Keywords:
MoS2doped two-dimensional materialsmechanical exfoliationoptical waveguidephotodetectorsol–geltransition metal dichalcogenides

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Area of Science:

  • Photonics
  • Materials Science
  • Optoelectronics

Background:

  • Transition metal dichalcogenides (TMDs) offer unique optical properties.
  • Sol-gel SiO2:TiO2 optical waveguides (WGs) are suitable for visible light applications.

Purpose of the Study:

  • To propose and demonstrate a MoS2-based photodetector integrated with a sol-gel WG.
  • To investigate light coupling and photodetection efficiency.

Main Methods:

  • Fabrication of a MoS2 photodetector on a sol-gel SiO2:TiO2 WG.
  • Spectroscopic measurements to analyze light channeling and absorption.
  • Photoresponsivity measurements at a bias voltage of 2 V.

Main Results:

  • Efficient light channeling from the WG to the MoS2 flake.
  • MoS2 photodetector exhibits photoresponsivity of 0.3 A/W (n-type) and 7.53 mA/W (p-type).
  • High refractive index contrast facilitates light coupling.

Conclusions:

  • The integrated device functions effectively as a photodetector.
  • Sol-gel WGs combined with van der Waals crystals hold significant potential for optoelectronic applications.