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Related Concept Videos

Metal-Semiconductor Junctions01:24

Metal-Semiconductor Junctions

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 semiconductor's...
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Interfacial Electrochemical Methods: Overview01:06

Interfacial Electrochemical Methods: Overview

Interfacial electrochemical methods focus on the phenomena occurring at the boundary between an electrode and a solution, as opposed to bulk methods that concentrate on the solution's overall properties. These interfacial methods are classified as either static or dynamic based on the presence of a nonzero current in the electrochemical cell and the consistency of analyte concentrations. Static methods, such as potentiometry, measure the cell's potential without any significant current passing...

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Related Experiment Video

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Ohmic Contact Fabrication Using a Focused-ion Beam Technique and Electrical Characterization for Layer Semiconductor Nanostructures
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Diamond-metal contacts: interface barriers and real-time characterization.

D A Evans1, O R Roberts, G T Williams

  • 1Institute of Mathematics and Physics, Aberystwyth University, Aberystwyth SY23 3BZ, UK.

Journal of Physics. Condensed Matter : an Institute of Physics Journal
|August 12, 2011
PubMed
Summary

Understanding diamond-metal contacts is crucial for electronics. This study reveals how aluminum film growth and annealing on p-diamond influence Schottky barrier height, transitioning from rectifying to ohmic behavior due to carbide formation.

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Area of Science:

  • Materials Science
  • Surface Science
  • Solid-State Physics

Background:

  • Diamond-metal contacts are vital for electronic devices.
  • Schottky barrier heights depend on complex interfacial properties.
  • A unified model for p-diamond barriers remains elusive.

Purpose of the Study:

  • To investigate the relationship between metal deposition, annealing, and electrical properties of diamond-metal contacts.
  • To elucidate the mechanisms governing Schottky barrier formation and modification.
  • To establish correlations between interfacial chemistry and contact behavior.

Main Methods:

  • Real-time monitoring of aluminum (Al) film growth on p-diamond using in situ photoelectron spectroscopy and atomic force microscopy (AFM).
  • In situ electrical measurements (IV characteristics) of macroscopic diodes.
  • Post-growth annealing up to 1000°C to study interfacial reactions.

Main Results:

  • Aluminum film growth transitions from layered to clustered morphology.
  • A rectifying contact with a barrier height of 1.05 V and ideality factor of 1.4 was observed during growth.
  • Interfacial carbide formation at 482°C correlated with the transition from rectifying to ohmic contact.

Conclusions:

  • The study provides a detailed case study of Al-p-diamond contacts, highlighting the role of growth morphology and interfacial reactions.
  • Carbide formation is identified as a critical factor in achieving ohmic contacts on p-diamond.
  • Real-time in situ techniques offer powerful insights into dynamic interfacial processes.