Electric Field Modulation of Near Infrared Absorption at Room Temperature in Electrochemically Self Assembled Quantum Dots

Autor:	Wang, Yanbin
Předmět:	self assembled quantum dots infrared absorption Electrical and Computer Engineering Engineering
Zdroj:	Retrospective ETD Collection.
Druh dokumentu:	Text
Popis:	This thesis is an investigation of infrared electro-absorption at room temperature in electrochemically self assembled Cadmium Sulfide quantum dots produced by electrodepositing the semiconductor in 50nm pores of an anodic alumina film. Infrared absorption in these systems is associated with real space transitions of electrons between electronic states in the Cadmium Sulfide quantum dots and trap states in the surrounding alumina. When an electric field is applied on a quantum dot, it modulates the absorption by altering the overlap between the wavefunctions of dot states and the trap states in the alumina. This results in a change in the matrix element for absorption. Such a phenomenon is reminiscent of the quantum confined Stark effect. The ability to electrically modulate absorption in these structures can result in inexpensive infrared signal processing devices operating at room temperature.
Databáze:	Networked Digital Library of Theses & Dissertations
Externí odkaz:	http://scholarscompass.vcu.edu/etd_retro/3 http://scholarscompass.vcu.edu/cgi/viewcontent.cgi?article=1002&context=etd_retro Zobrazit plný text záznamu