Accession Number : ADA308931

Title :   Processes of Efficient Visible Light Emission In Silicon Nanostructures.

Descriptive Note : Doctoral thesis,

Corporate Author : AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH

Personal Author(s) : Estes, Michael J.

PDF Url : ADA308931

Report Date : NOV 1995

Pagination or Media Count : 201

Abstract : Recent observations of efficient visible light emission from porous and nanostructured silicon are intriguing as they give us hope for the eventual realization of silicon based electroluminescent devices. These results are also quite unexpected, as bulk silicon is a poor light emitting material. Attempts to understand the mechanisms of this light emission have focused on quantum confined silicon crystallites, luminescent surface molecular compounds, disordered silicon surfaces, and luminescent oxide related defects. The purpose of this thesis is to further our understanding of the light emission processes in nanoscale silicon structures like porous silicon. I present the results of theoretical and experimental investigations and show that crystallinity is not required for efficient light emission from silicon, that quantum confined states in silicon may be observable by electroabsorption spectroscopy, and that redeposition of luminescent surface compounds onto the surface of porous silicon may occur during etching.

Descriptors :   *ELECTROLUMINESCENCE, *EMISSION SPECTRA, *SILICON, THESES, ORDER DISORDER TRANSFORMATIONS, CRYSTALS, ETCHING, DEPOSITION, RADIATION ABSORPTION, QUANTUM EFFICIENCY, VISIBLE SPECTRA, EMISSION SPECTROSCOPY, CONFINEMENT(GENERAL), POROUS MATERIALS, NANOTECHNOLOGY.

Subject Categories : Atomic and Molecular Physics and Spectroscopy

Distribution Statement : APPROVED FOR PUBLIC RELEASE