Publication

Kelvin Probe and Synchrotron Radiation Study of Surface Photovoltage and Band Bending at Metal GaAs (100) Interfaces

Giorgio Margaritondo
1992
Journal Articles

Abstract

Contact potential difference (CPD) measurements using a Kelvin probe coupled with synchrotron radiation are used to investigate the surface photovoltage (SPV) induced by synchrotron radiation at GaAs surfaces. A large and quasi-permanent SPV is found at surfaces of low-doped and low-temperature samples. SPV discharge mechanisms are investigated. The CPD technique is used to define conditions under which SPV is negligible, leading to reliable measurements of band bending at low temperature. Band bending measurements are reported for interfaces between metals and GaAs (100) surfaces.

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https://infoscience.epfl.ch/entities/publication/5dde8e28-d65a-4551-85b7-a75f9fd196c7

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Giorgio Margaritondo
1992
Journal Articles

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/5dde8e28-d65a-4551-85b7-a75f9fd196c7

About this result

Related concepts (32)

Synchrotron light source

A synchrotron light source is a source of electromagnetic radiation (EM) usually produced by a storage ring, for scientific and technical purposes. First observed in synchrotrons, synchrotron light is now produced by storage rings and other specialized particle accelerators, typically accelerating electrons. Once the high-energy electron beam has been generated, it is directed into auxiliary components such as bending magnets and insertion devices (undulators or wigglers) in storage rings and free electron lasers.

Band bending

In solid-state physics, band bending refers to the process in which the electronic band structure in a material curves up or down near a junction or interface. It does not involve any physical (spatial) bending. When the electrochemical potential of the free charge carriers around an interface of a semiconductor is dissimilar, charge carriers are transferred between the two materials until an equilibrium state is reached whereby the potential difference vanishes.

Synchrotron radiation

Synchrotron radiation (also known as magnetobremsstrahlung radiation) is the electromagnetic radiation emitted when relativistic charged particles are subject to an acceleration perpendicular to their velocity (a ⊥ v). It is produced artificially in some types of particle accelerators or naturally by fast electrons moving through magnetic fields. The radiation produced in this way has a characteristic polarization, and the frequencies generated can range over a large portion of the electromagnetic spectrum.

Related publications (8)

Kelvin Probe and Synchrotron Radiation Study of Surface Photovoltage and Band Bending at Metal GaAs (100) Interfaces

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