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A 2D semiconductor-self-assembled monolayer photoswitchable diode.

Emanuela Margapoti1, Juan Li, Özlem Ceylan

  • 1Walter Schottky Institute, Physik-Department and NIM, Technische Universität München, Am Coulombwall 4, Garching, D-85748, Germany.

Advanced Materials (Deerfield Beach, Fla.)
|February 3, 2015
PubMed
Summary

Researchers created a switchable diode using a 2D semiconductor and molecular layer. Photoisomerization of azobenzene molecules enables switching between a highly rectifying state and a conductive state.

Keywords:
2D crystalsazobenzenesdopingsemiconductorswork functions

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Nanotechnology

Background:

  • Two-dimensional (2D) semiconductor heterostructures offer unique electronic properties.
  • Molecular junctions provide a platform for nanoscale electronic devices.
  • Controlling conductivity in molecular junctions is crucial for advanced electronics.

Purpose of the Study:

  • To report a switchable diode based on a 2D semiconductor-molecular junction heterostructure.
  • To demonstrate photoisomerization-induced switching in such a device.
  • To investigate the rectifying and conductive properties of the heterostructure.

Main Methods:

  • Exfoliation of Molybdenum disulfide (MoS2) onto a monolayer of azobenzene-substituted thiols on a gold substrate.
  • Utilizing conducting atomic force microscopy (CAFM) to probe the electronic properties.
  • Inducing photoisomerization of the azobenzene molecules to control the junction's state.

Main Results:

  • Successfully fabricated a heterostructure comprising MoS2 and azobenzene-functionalized gold.
  • Demonstrated photoisomerization of azobenzene leading to a reversible switching behavior.
  • Observed switching between a highly rectifying state (rectifying ratio of 10^4) and a conductive state.

Conclusions:

  • The reported heterostructure functions as a switchable diode.
  • Photoisomerization of azobenzene is an effective mechanism for controlling conductivity in 2D semiconductor-molecular junctions.
  • This work presents a pathway towards molecular-level electronic switching devices.