Correlation between optical and structural properties of InxGa1-xN alloys with 1≦x≦2
| Autor: | Yu-Hsiu Huang, 黃裕修 |
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| Rok vydání: | 2006 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 94 In this thesis we report a detailed study on the structural and optical properties of InGaN alloys. Quite interesting results have been obtained from our studies which would be very useful for our understanding and application of these materials. Our investigation is concentrated on the origin of Stokes shift in InxGa1-xN alloys with 0≦x≦1. The fundamental band gaps of InGaN alloys, depending on the indium concentration, can cover from near-ultraviolet to infrared, as a result this alloy system is capable of generating many optoelectronic devices. Based on the absorption and luminescence spectra, it clearly shows that there exists a large Stokes shift in InGaN alloys. Our experimental results together with the previous reports lead to a complete picture of the Stokes shift covering 0≦x≦1. Combining with the measurements of scanning electron microscope, cathodoluminescence, energy dispersive spectroscopy, and photoluminescence, we establish that the origin of the Stokes shift in InGaN ternary compound arises from alloy composition fluctuations. |
| Databáze: | Networked Digital Library of Theses & Dissertations |
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