多量子點系統之熱電效應

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蕭聖學(Sheng-Xue Xiao) 查詢紙本館藏

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論文名稱

多量子點系統之熱電效應
(Thermoelectric Properties in Multiple Quantum Dot System)

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摘要(中)

本論文所探討的是將量子點嵌入於絕緣層，並且在絕緣層的兩端連接上金屬電極形成一個多量子點之熱電轉換的系統，並且模擬此系統在庫倫阻斷區域中的電導、熱導、thermal power、以及ZT值。此多量子點的系統以多能階的安德森模型來描述，並且藉由Keldysh格林函數的技巧，來計算電子與熱在穿遂過程中所產生的電流與熱流。當系統操作在線性區域之中，且穿隧率很小的情況之下，雖然電子的庫倫交互作用力對ZT值的影響甚巨，但是仍然可以得到相當不錯的ZT值。

摘要(英)

The electrical conductance, thermal conductance, thermal power and figure of merit (ZT) of semiconductor quantum dots (QDs) embedded into an insulator matrix connected with metallic electrodes are theoretically investigated in the Coulomb blockade regime. The multilevel Anderson model is used to simulate the multiple QDs junction system. The charge and heat currents in the sequential tunneling process are calculated by the Keldysh Green function technique. In the linear response regime the ZT values are still very impressive in the small tunneling rates case, although the effect of electron Coulomb interaction on ZT is significant.

關鍵字(中)

★ 量子點
★ 熱電優值
★ 熱電效應

關鍵字(英)

★ figure of merit
★ Thermoelectric effect
★ quantum dot

論文目次

目錄
摘要 Ⅰ
Abstract Ⅱ
誌謝 Ⅲ
目錄 IⅤ
圖目錄 Ⅵ
表目錄 ⅥI
第一章導論 1
1-1 前言 1
1-2熱電元件簡介 2
1-3 熱電元件基本定理 4
1-4 熱電材料發展 6
第二章理論原理 9
2-1 系統模型 9
2-2 推遲格林函數 13
2-2-1 單量子點格林函數 14
2-2-2 多量子點格林函數 14
2-3 量子點電晶體ZT的定義 18
第三章單電子電晶體熱電特性 21
3-1 前言 21
3-2 多量子點系統 23
3-2-1 元件結構 23
3-2-2 基態能階偏移 25
3-2-3 電子庫倫交互作用 27
3-2-4 電子的非彈性碰撞 29
3-3 聲子熱導 31
第四章閘極電壓對多量子點系統之影響 34
4-1 前言 34
4-1-1 ZT值與其各項參數 34
4-2 閘極電壓對不同量子點系統的影響 38
4-2-1 閘極電壓對量子點在不同間距下的影響 38
4-2-2 閘極電壓對相異量子點系統的影響 40
第五章結論 41
參考文獻 42

參考文獻

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指導教授

郭明庭(David M.-T. Kuo)

審核日期

2010-7-12

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