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Related Concept Videos

Metal-Semiconductor Junctions01:24

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The contact of metal and semiconductor can lead to the formation of a junction with either Schottky or Ohmic behavior.
Schottky Barriers
Schottky barriers arise when a metal with a work function (Φm) contacts a semiconductor with a different work function (Φs). Initially, electrons transfer until the Fermi levels of the metal and semiconductor align at equilibrium. For instance, if Φm > Φs, the semiconductor Fermi level is higher than the metal's before contact. The...
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Biasing metal-semiconductor junctions involves applying a voltage across the junction. Specifically, the metal is connected to a voltage source, while the semiconductor is grounded. This technique is essential for controlling the direction and magnitude of current flow in electronic devices, including diodes, transistors, and photovoltaic cells.
In Schottky junctions, where the semiconductor is n-type, applying a positive voltage to the metal relative to the semiconductor reduces its Fermi...
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Does p-type ohmic contact exist in WSe2-metal interfaces?

Yangyang Wang1, Ruo Xi Yang2, Ruge Quhe3

  • 1State Key Laboratory for Mesoscopic Physics and Department of Physics, Peking University, Beijing 100871, P. R. China. jinglu@pku.edu.cn and Department of Nuclear Science and Engineering and Department of Materials Science and Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA.

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|December 16, 2015
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Summary

Achieving low-resistance metal contacts is crucial for two-dimensional WSe2 devices. This study reveals that Platinum (Pt) contacts, with spin-orbital coupling (SOC) effects, enable p-type ohmic contacts, overcoming previous limitations.

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Nanotechnology

Background:

  • Two-dimensional (2D) transition metal dichalcogenides like WSe2 possess exceptional electronic properties.
  • The performance of WSe2-based devices is significantly hindered by the formation of high-resistance metal contacts.
  • Understanding interfacial properties is key to optimizing device fabrication and functionality.

Purpose of the Study:

  • To conduct a comprehensive comparative analysis of interfacial properties between monolayer/bilayer WSe2 and various metal contacts (Sc, Al, Ag, Au, Pd, Pt).
  • To investigate the influence of interlayer coupling and spin-orbital coupling (SOC) effects on Schottky barrier heights (SBHs).
  • To identify suitable metal electrodes for achieving low-resistance, potentially ohmic, contacts in WSe2 devices.

Main Methods:

  • Utilizing ab initio energy band calculations, including SOC effects, to model WSe2-metal interfaces.
  • Employing quantum transport simulations to assess the electrical characteristics of the contacts.
  • Performing comparative studies across multiple metal electrodes (Sc, Al, Ag, Au, Pd, Pt) and WSe2 thicknesses (monolayer/bilayer).

Main Results:

  • Interlayer coupling generally reduces both electron and hole SBHs, modifying contact polarity for WSe2-Au.
  • Spin-orbital coupling (SOC) primarily decreases the hole SBH.
  • Without SOC, Palladium (Pd) exhibits the lowest hole SBH, while Platinum (Pt) with SOC achieves p-type ohmic or quasi-ohmic contact.

Conclusions:

  • The selection of metal electrodes significantly impacts the contact properties of WSe2 devices.
  • Spin-orbital coupling plays a critical role in determining the nature of WSe2-metal interfaces, particularly for hole transport.
  • Platinum (Pt) emerges as a promising candidate for achieving high-performance p-type ohmic contacts in monolayer/bilayer WSe2 devices.