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Biasing of Metal-Semiconductor Junctions

Biasing of Metal-Semiconductor Junctions

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.
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Semiconductors

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Types of Semiconductors

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Related Experiment Video

Updated: Jul 1, 2026

Monolayer Contact Doping of Silicon Surfaces and Nanowires Using Organophosphorus Compounds

Monolayer Contact Doping of Silicon Surfaces and Nanowires Using Organophosphorus Compounds

Published on: December 2, 2013

Molecularly controlled metal-semiconductor junctions on silicon surface: a dipole effect.

R K Hiremath¹, M K Rabinal, B G Mulimani

¹Department of Physics, Karnatak University, Dharwad, India.

Langmuir : the ACS Journal of Surfaces and Colloids

|September 16, 2008

Summary

Organic molecules chemically attached to silicon surfaces alter semiconductor band bending. This modification systematically changes electrical charge transport in metal-molecule-silicon junctions, paving the way for molecular electronics.

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Area of Science:

Materials Science
Surface Chemistry
Semiconductor Physics

Background:

Chemically modifying semiconductor surfaces with organic molecules is crucial for tuning electronic properties.
Understanding the relationship between molecular properties and semiconductor behavior is key for advanced electronic devices.

Purpose of the Study:

To investigate the effect of organic molecules with varying dipole moments on silicon surface band bending.
To analyze the charge transport properties of metal-molecule-silicon junctions formed with ethynylbenzene derivatives.
To explore the potential of molecular electronics for applications in solar cells and sensors.

Main Methods:

Covalent attachment of homologous organic molecules with different dipole moments to a silicon surface.
Surface photovoltage measurements to assess changes in surface band bending.
Fabrication of metal-molecule-silicon junctions using soft mercury contacts.
Electrical characterization of junctions to determine parameters like ideality factor and barrier height.

Main Results:

Organic molecules significantly influence the surface band bending of silicon semiconductors.
Metal-molecule-silicon junctions exhibit systematic changes in electrical charge transport correlated with molecular dipole moments.
Key junction parameters (ideality factor, barrier height, interface state density) were quantified, revealing the role of organic molecules.

Conclusions:

The dipole moment of covalently attached organic molecules profoundly impacts silicon surface properties and junction electrical characteristics.
These findings demonstrate the potential for designing molecular electronic devices by controlling interfacial molecular properties.
The research opens avenues for developing novel solar cells and chemical/biological sensors based on molecular electronics.