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- W1499203492 abstract "SEM-based cathodoluminescence (CL) is an important microcharacterization technique for the analysis of luminescent materials and defect-related effects. Cathodoluminescence (CL) imaging and spectroscopy have been used by the previous doctoral student, Lan-lin Chao, to investigate various properties of semiconductor materials, including GaAs/AlGaAs quantum well structures, ZnSe-based laser structures and GaN films. The present author has continued this work mainly on ZnCdSe quantum well structures fabricated by Prof. Tamargo's group at CUNY. The main concern for ZnCdSe quantum well (QW) luminescent devices is to understand how the as-grow defects or externally induced defects affect the performance of devices. Based on the CL studies of various samples, which are strained and latticematched, Cd-rich and poor, high and low in density of pre-existing defects, it is reported here that the degradation of ZnCdSe-based QW structures depends on the chemical composition of the QW layer. Associated with the difference of Cd composition x in QW layers Zn1-xCdxSe, the degradation has different morphologies. Cd-poor (x-0.2) QW structures usually form dark line defects (DLDs) along crystallographic directions after degradation, while Cd-rich (x-O.S) QW structures tend to form only dark spot defects (DSDs), independent of epitaxial strain and the density of as-grow defects. Besides the result from experiments (Chapter 4), some theoretical modeling calculations involved in CL studies are described in Chapter 3. They are (1) theoretical calculation of CL intensity and diffusion length of free carriers in quantum well structures, and (2) derivation of temperature-dependent population of free electron-hole pairs and excitons, which give theoretical support for conclusions drawn from our experiments. In the first two chapters, the background of this research, and cathodoluminescence and quantum well heterostructures is introduced." @default.
- W1499203492 created "2016-06-24" @default.
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- W1499203492 date "1998-01-01" @default.
- W1499203492 modified "2023-10-06" @default.
- W1499203492 title "SEM-cathodoluminescence studies of ZnDdSe-based quantum well structures" @default.
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