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Related Concept Videos

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A chemical formula presents information about the proportions of atoms constituting a particular chemical compound or molecule, mainly using symbols of elements and numbers. At times other symbols, such as dashes, parentheses, brackets, commas, plus, and minus signs, are also used. A chemical formula can be one of three types – molecular, empirical, and structural.
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Related Experiment Video

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Exfoliation and Analysis of Large-area, Air-Sensitive Two-Dimensional Materials
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Robust Photodetectable Paper from Chemically Exfoliated MoS2-MoO3 Multilayers.

Yuefan Wei1, Van-Thai Tran1, Chenyang Zhao2

  • 1School of Mechanical and Aerospace Engineering , Nanyang Technological University , 50 Nanyang Avenue , 639798 , Singapore.

ACS Applied Materials & Interfaces
|June 13, 2019
PubMed
Summary

Researchers developed a novel photodetector using molybdenum disulfide (MoS2) and molybdenum trioxide (MoO3) on a flexible paper substrate. This simple fabrication method yields a high-performance photodetector with enhanced sensitivity to specific light wavelengths.

Keywords:
MoSinkjet printingpaperphotodetectorphotoresponse

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Optoelectronics

Background:

  • Photodetectors are crucial for various applications, including security and healthcare.
  • Molybdenum disulfide (MoS2), a 2D material, offers promising optoelectronic properties but faces challenges in processing and device fabrication.
  • Enhancing photodetector performance and simplifying fabrication are key research goals.

Purpose of the Study:

  • To fabricate a high-performance, solution-processed photodetector using molybdenum disulfide (MoS2) and molybdenum trioxide (MoO3).
  • To investigate the photodetector's response to different light wavelengths.
  • To demonstrate a simple and scalable fabrication route for MoS2-based photodetectors.

Main Methods:

  • Chemical exfoliation of MoS2 powder.
  • Deposition onto a cellulose ester membrane.
  • Inkjet printing of PEDOT:PSS electrodes.
  • Testing device performance under various light wavelengths (purple, green, red).

Main Results:

  • A photodetector based on a mixture of double-phased MoS2 (1T and 2H) and MoO3 was successfully fabricated.
  • The device exhibited the highest internal quantum efficiency (0.063%) and responsivity (0.134 mA W-1) under purple light (405 nm).
  • Achieved responsivity significantly surpasses other solution-derived MoS2 photodetectors, attributed to enhanced photoelectron generation and efficient charge transport.

Conclusions:

  • A straightforward exfoliation/filtration and inkjet printing route enables the fabrication of high-performance MoS2-based photodetectors.
  • The MoS2/MoO3 composite material enhances photoelectron generation and charge transport, leading to superior photodetection.
  • The study highlights the potential of this simple fabrication approach for advanced photodetector applications.