臺灣博碩士論文加值系統

本篇論文使用摻鈦藍寶石雷射加上螢光上轉換(photoluminescence Up-
conversion) 技術對氮化銦進行光致螢光(photoluminescence)光譜量測。從不同延遲
時間的光致螢光光譜可以得到載子溫度隨時間的變化，藉此來研究在相同激發載子濃度，而背景載子濃度不同的情況下的載子冷卻情況。觀察到背景載子濃度較高時，會使得初始載子溫度較低。以及激發的載子濃度相同時，聲學聲子的溫度也會接近。我們比較了有考慮歐傑加熱與沒有歐傑加熱時的載子冷卻模型，有歐傑加熱時的模型明顯可以得到更佳的結果。所以在總載子濃度高的情況下，我們認為能量損失率還要考慮歐傑復合造成的加熱影響，才能更好的解釋載子冷卻的情形。

We use Ti: Sapphire Laser and photoluminescence up-conversion technique to study Time-resolved photoluminescence in InN. From Time-resolved photoluminescence, we obtain the carrier temperature vary with time. From time dependent carrier temperature, we can study carrier cooling in InN. In the same photoexcited carrier density, we found that when the background carrier density increase, the initial carrier temperature decrease.
By compare energy lose rate with auger heating and energy lose rate without auger heating, energy lose rate with auger heating will get better result. Therefore, in high carrier density, we consider that in order to explain the carrier cooling better we should consider auger heating.

論文審定書 ............................................................................................................... i
致謝 .......................................................................................................................... ii
摘要 ......................................................................................................................... iii
Abstract .................................................................................................................... iv
目錄 .......................................................................................................................... v
圖目錄 .................................................................................................................... vii
表目錄 ..................................................................................................................... ix
第一章 導論 ...................................................................................................... 1
1.1 前言 ...................................................................................................... 1
1.2 載子冷卻機制 ...................................................................................... 1
1.3 文獻探討 .............................................................................................. 2
1.4 歐傑復合與歐傑加熱 .......................................................................... 3
第二章 基本原理介紹 ...................................................................................... 6
2.1 導電帶中電子的能量釋放過程 .......................................................... 6
2.2 電子與電洞復合的釋放能量方式 ...................................................... 7
2.3 載子衰退率 .......................................................................................... 9
第三章 實驗原理與架設 ................................................................................ 12
3.1 非線性光學 ........................................................................................ 12
3.2 和頻光原理 ........................................................................................ 14
3.3 光生載子濃度的計算 ........................................................................ 16
3.4 實驗架構 ............................................................................................ 17
第四章 實驗結果與討論 ................................................................................ 20
4.1 樣品資訊 ............................................................................................ 20
4.2 不同延遲時間的螢光光譜 ................................................................ 22
4.3 載子濃度與時間關係 ........................................................................ 25
4.4 載子冷卻分析 .................................................................................... 26
第五章 結論 .................................................................................................... 37
參考文獻 ................................................................................................................ 38

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