Publication

Photoemission electron microscopy studies of Pt/GaP(001) buried interfaces

Giorgio Margaritondo
1996
Journal Articles

Abstract

Using (secondary) photoelectron emission microscopy, we studied the fully formed 80 Angstrom Pt/n-GaP(001) interface with a lateral resolution better than 2 mu m. We probed the chemically etched and sulfur passivated GaP(001) surface by ultraviolet and soft x rays. The radiation source was either a deuterium lamp or the radiation from ELETTRA's U12.5 undulator. Due to their escape depth, the photoemitted secondary electrons carry chemical information of buried interfaces. The use of tunable synchrotron radiation enabled us to obtain chemical contrast by digital subtraction of the microimages taken at photon energies above and below each core-level absorption edge. The microimages revealed lateral changes in photoyield efficiency and chemical composition. The results were confirmed by x-ray photoemission spectromicroscopy measurements performed using A1 K alpha radiation. (C) 1996 American Institute of Physics.

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https://infoscience.epfl.ch/entities/publication/d11be653-13df-4345-8e19-aa2dbba64c2d

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Giorgio Margaritondo
1996
Journal Articles

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/d11be653-13df-4345-8e19-aa2dbba64c2d

About this result

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Ionizing radiation

Ionizing radiation (or ionising radiation), including nuclear radiation, consists of subatomic particles or electromagnetic waves that have sufficient energy to ionize atoms or molecules by detaching electrons from them. Some particles can travel up to 99% of the speed of light, and the electromagnetic waves are on the high-energy portion of the electromagnetic spectrum. Gamma rays, X-rays, and the higher energy ultraviolet part of the electromagnetic spectrum are ionizing radiation, whereas the lower energy ultraviolet, visible light, nearly all types of laser light, infrared, microwaves, and radio waves are non-ionizing radiation.

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Photoemission electron microscopy studies of Pt/GaP(001) buried interfaces

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