Accession Number : ADA313756

Title :   Probing the Carrier Recombination Dynamics of Strained Semiconductor Quantum Heterostructures and Nanostructures.

Descriptive Note : Final progress rept.,

Corporate Author : UNIVERSITY OF SOUTHERN CALIFORNIA LOS ANGELES DEPT OF MATERIALS SCIENCE AND E NGINEERING

Personal Author(s) : Rich, Daniel H.

PDF Url : ADA313756

Report Date : 31 JUL 1996

Pagination or Media Count : 7

Abstract : The aim of this research is to examine the structural and optical properties of reduced-dimensionality structures (quantum wires and dots) using novel spatially, spectrally, and temporally resolved electron probes. An optimization of the carrier collection efficiency in quantum wires and dots is of paramount importance in utilizing nanostructures in quantum wire and dot lasers. An extremely powerful and unique high-speed time-resolved cathodoluminescence (CL) system has been developed by Prof. Rich using funds from this DURIP award. This system augments an existing scanning electron microscopy-based CL system which had already yielded important non-time-resolved results for quantum heterostructures and nanostructures. The necessary electronic instrumentation for high-speed electron beam blanking, light detection, and time-correlated single photon counting has been purchased and successfully implemented. The carrier recombination dynamics and collection efficiency in GaAs/AlGaAs quantum dots and InGaP quantum wires are being studied using spatially, spectrally, and temporally resolved cathodoluminescence. Our work in 1996 and beyond will focus on studies of the carrier recombination dynamics and optical properties of quantum wire and box nanostructures and the influence of structural defects on these properties.

Descriptors :   *QUANTUM ELECTRONICS, *RECOMBINATION REACTIONS, OPTICAL PROPERTIES, OPTIMIZATION, EFFICIENCY, SEMICONDUCTOR LASERS, ELECTRON BEAMS, PUMPING(ELECTRONICS), DEFECTS(MATERIALS), CATHODOLUMINESCENCE, ELECTRON PROBES, BLANKING(ELECTRONICS).

Subject Categories : Lasers and Masers

Distribution Statement : APPROVED FOR PUBLIC RELEASE