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Extraordinary electroconductance in metal-semiconductor hybrid structures.

Yun Wang, A K M Newaz, Jian Wu

Applied Physics Letters

|June 17, 2009

Summary

This study reveals extraordinary electroconductance (EEC) in metal-semiconductor structures, showing a 5.2% gain due to electron emission and geometric amplification. A model confirms the geometry-dependent field effect in this novel phenomenon.

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Area of Science:

Materials Science
Solid-State Physics
Electrical Engineering

Background:

Metal-semiconductor hybrid structures are crucial for electronic devices.
Understanding charge transport mechanisms is key to improving device performance.
Extraordinary electroconductance (EEC) is a recently observed phenomenon.

Purpose of the Study:

To investigate and characterize extraordinary electroconductance (EEC) in microscopic metal-semiconductor hybrid structures.
To elucidate the underlying physical mechanisms responsible for EEC.
To develop a model explaining the geometry dependence of the field effect in EEC.

Main Methods:

Fabrication of hybrid structures using GaAs epitaxial layers and Ti thin film shunts.
Utilizing four-lead Van der Pauw measurements to quantify electroconductance.
Applying electric fields (+2.5 kV/cm) to observe conductance changes under zero shunt bias.

Main Results:

Observed a significant gain of 5.2% in electroconductance.
Attributed the conductance increase to thermionic field emission of electrons and geometrical amplification.
Developed a model that accurately predicts experimental data and highlights geometry dependence.

Conclusions:

Extraordinary electroconductance (EEC) is a distinct phenomenon in metal-semiconductor structures.
The observed effect is driven by a combination of electron emission and geometric field effects.
EEC devices exhibit unique characteristics differentiating them from conventional field-effect transistors (FETs).