Publication

Degradation and defects in electron-beam-pumped Zn1-xCdxSe/ZnSe GRINSCH blue-green lasers

Jean-Daniel Ganière
1996
Book Chapters

Abstract

We explore the defect distribution and the degradation in electron beam pumped Zn1-xCdxSe/ZnSe laser structures by combining cathodoluminescence measurements in a scanning electron microscope with transmission electron microscopy. We found that degradation occurs via the formation of [100]-oriented dark line defects, and that it involves the formation of a characteristic type of defect, namely dislocation loops within the ZnCdSe quantum well, which grow to form a characteristic network as degradation processes.

Official source

https://infoscience.epfl.ch/entities/publication/737e45d1-82c0-448b-b457-aa53a917f29a

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Jean-Daniel Ganière
1996
Book Chapters

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/737e45d1-82c0-448b-b457-aa53a917f29a

About this result

Related concepts (32)

Electron microscope

An electron microscope is a microscope that uses a beam of electrons as a source of illumination. They use electron optics that are analogous to the glass lenses of an optical light microscope. As the wavelength of an electron can be up to 100,000 times shorter than that of visible light, electron microscopes have a higher resolution of about 0.1 nm, which compares to about 200 nm for light microscopes.

Scanning electron microscope

A scanning electron microscope (SEM) is a type of electron microscope that produces images of a sample by scanning the surface with a focused beam of electrons. The electrons interact with atoms in the sample, producing various signals that contain information about the surface topography and composition of the sample. The electron beam is scanned in a raster scan pattern, and the position of the beam is combined with the intensity of the detected signal to produce an image.

Crystallographic defect

A crystallographic defect is an interruption of the regular patterns of arrangement of atoms or molecules in crystalline solids. The positions and orientations of particles, which are repeating at fixed distances determined by the unit cell parameters in crystals, exhibit a periodic crystal structure, but this is usually imperfect. Several types of defects are often characterized: point defects, line defects, planar defects, bulk defects. Topological homotopy establishes a mathematical method of characterization.

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Degradation and defects in electron-beam-pumped Zn1-xCdxSe/ZnSe GRINSCH blue-green lasers

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