Surface State Effects on the Optical Properties of InGaN Multiple Quantum Well
碩士 === 國立臺灣大學 === 光電工程學研究所 === 90 === In this thesis, the effects of surface states on the band structure and optical properties of n-type doped indium gallium nitride (InGaN) multiple quantum wells (MQWs) are investigated. Based on a conventional self-consistent analysis of the Schröding...
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ndltd-TW-090NTU001240152015-10-13T14:38:05Z http://ndltd.ncl.edu.tw/handle/17839320367120071044 Surface State Effects on the Optical Properties of InGaN Multiple Quantum Well 表面態對含有n型摻雜氮化銦鎵多重量子井光學性質之研究 Chin-Wen Shih 石清文 碩士 國立臺灣大學 光電工程學研究所 90 In this thesis, the effects of surface states on the band structure and optical properties of n-type doped indium gallium nitride (InGaN) multiple quantum wells (MQWs) are investigated. Based on a conventional self-consistent analysis of the Schrödinger and Poisson equations, this calculation model incorporating surface states is conducive to solving the band structures of nitride-based MQWs. The two-dimensional electron gas (2DEG) coming from the surface states and intentional dopants congregates the material interfaces to screen the polarization charge. The phenomenon explains the hypothesis of the “periodic boundary condition of electric field” and the “equivalent charge model”. Moreover, the screening amount of polarization charge varies with the Fermi level, the temperature, and the density of injection carriers. By means of the optical pumping experiment of the InGaN MQW sample, the accuracy of the present model (called the “surface state model”) can be confirmed. The “surface state model” is more accurate than the “equivalent charge model” at the peak energy by comparing with the 300K and 77K PL results. It shows that the linearity between the piezoelectric fields screening and the peak energy shifting plays an important role in optical properties of InGaN MQWs. Lung-Han Peng 彭隆瀚 2002 學位論文 ; thesis 93 zh-TW |
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碩士 === 國立臺灣大學 === 光電工程學研究所 === 90 === In this thesis, the effects of surface states on the band structure and optical properties of n-type doped indium gallium nitride (InGaN) multiple quantum wells (MQWs) are investigated. Based on a conventional self-consistent analysis of the Schrödinger and Poisson equations, this calculation model incorporating surface states is conducive to solving the band structures of nitride-based MQWs. The two-dimensional electron gas (2DEG) coming from the surface states and intentional dopants congregates the material interfaces to screen the polarization charge. The phenomenon explains the hypothesis of the “periodic boundary condition of electric field” and the “equivalent charge model”. Moreover, the screening amount of polarization charge varies with the Fermi level, the temperature, and the density of injection carriers.
By means of the optical pumping experiment of the InGaN MQW sample, the accuracy of the present model (called the “surface state model”) can be confirmed. The “surface state model” is more accurate than the “equivalent charge model” at the peak energy by comparing with the 300K and 77K PL results. It shows that the linearity between the piezoelectric fields screening and the peak energy shifting plays an important role in optical properties of InGaN MQWs.
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Lung-Han Peng |
author_facet |
Lung-Han Peng Chin-Wen Shih 石清文 |
author |
Chin-Wen Shih 石清文 |
spellingShingle |
Chin-Wen Shih 石清文 Surface State Effects on the Optical Properties of InGaN Multiple Quantum Well |
author_sort |
Chin-Wen Shih |
title |
Surface State Effects on the Optical Properties of InGaN Multiple Quantum Well |
title_short |
Surface State Effects on the Optical Properties of InGaN Multiple Quantum Well |
title_full |
Surface State Effects on the Optical Properties of InGaN Multiple Quantum Well |
title_fullStr |
Surface State Effects on the Optical Properties of InGaN Multiple Quantum Well |
title_full_unstemmed |
Surface State Effects on the Optical Properties of InGaN Multiple Quantum Well |
title_sort |
surface state effects on the optical properties of ingan multiple quantum well |
publishDate |
2002 |
url |
http://ndltd.ncl.edu.tw/handle/17839320367120071044 |
work_keys_str_mv |
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