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研究生:吳亞芬
研究生(外文):WU YA-FEN
論文名稱:砷化銦/砷化鎵量子點異質結構之載子動力學探討
論文名稱(外文):Carrier Dynamics Study of InAsGaAs Quantum-Dot Heterostructures
指導教授:倪澤恩
指導教授(外文):NEE TZER-EN
學位類別:博士
校院名稱:長庚大學
系所名稱:電子工程研究所
學門:工程學門
學類:電資工程學類
論文種類:學術論文
論文出版年:2006
畢業學年度:95
語文別:英文
論文頁數:100
中文關鍵詞:量子點異質結構熱重新分佈效應電子聲子散射效應速率方程式
外文關鍵詞:quantum-dot heterostructuresthermal redistribution effectselectron-phonon scattering effectsrate equations
相關次數:
  • 被引用被引用:1
  • 點閱點閱:183
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  • 收藏至我的研究室書目清單書目收藏:0
本論文是以實驗方法與理論分析,來探討自聚性砷化銦/砷化鎵量子點異質結構內的載子動力學機制。我們提出一個涵蓋了量子點尺寸分佈,隨機式能態密度分佈,以及量子點系統內所有重要的載子遷移機制的理論模型。模型中所考慮的載子遷移機制包括了載子的捕獲與鬆弛,放射性與非放射性結合,熱躍遷與再捕獲,以及熱導致的電子–聲子散射效應等。量子點系統內與熱重新分佈效應、載子水平遷移、能態密度佔據率有關的各項動力學機制,均被詳細的加以說明與討論。在實驗上,我們對具有不同量子點尺寸分佈情形的砷化銦量子點樣品,量測其變溫及變功率的光激光譜圖,並以建立的理論模型對實驗結果做分析;除此之外,也詳盡探討了量子點系統內,藉由聲子輔助所產生的載子遷移現象,及其對光激光譜的影響。最後,對於熱重新分佈效應及電子聲子散射效應兩者之間關連性的定量化討論,使我們能夠明確的解釋隨溫度上升所量測觀察到的,來自於不同尺寸分佈之量子點樣品,其所表現出的不同變溫光激光譜特性。
We investigate the carrier dynamics of the self-assembled InAs/GaAs quantum-dot (QD) heterostructures experimentally and theoretically. Theoretical discussions that take into account the dot size distribution, the random population of density of states, and the important carrier transferring mechanisms of a QD system, are proposed. The carrier capturing and relaxing, radiative and nonradiative recombination, thermal emission and retrapping, and the thermal induced electron-phonon scattering, are all considered. Mechanisms of carrier dynamics in QD system related to the thermal redistribution and lateral transition of excitons, and the filling effect on density of states, are discussed in detail. The temperature and incident-power dependent photoluminescence spectra from QD samples with different dot size distributions are measured and studied. In addition, the phonon-assisted activations of excitons in the QD system are analyzed. Quantitative discussion of the correlation between thermal redistribution and electron-phonon scattering effects on QD system provides distinct explanation for the different behaviors with increasing temperature that observed in the photoluminescence spectra from QD heterostructures.
CHAPTER I Introduction

1.1 Historical Development
1.2 Objective of the Study

CHAPTER II Experimental Results

CHAPTER III Theoretical Model

CHAPTER IV Carrier Hopping and Retrapping Effects on
Photoluminescence Spectra

4.1 Discussions of Temperature Dependent PL Spectra
4.2 Discussions of Incident-Power Dependent PL Spectra

CHAPTER V Phonon-assisted Effects on Photoluminescence Spectra

5.1 Electron-Phonon Scattering Effect
5.2 Intersublevel Relaxation Process

CHAPTER VI Conclusions and Future Work

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