庫倫阻斷區間的量子點分子引擎分析

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姓名

楊廷煜(Ting-Yu Yang) 查詢紙本館藏

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電機工程學系

論文名稱

庫倫阻斷區間的量子點分子引擎分析

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摘要(中)

本論文討論了三顆串接耦合量子點的能源回收引擎之效率，該引擎將環境中的熱能轉換成電能。藉由引入外部負載，解系統的自洽方程式，可以推得能源回收引擎的穿隧電流、感應熱電位以及回收效率。我們發現系統於溫差驅動之下，其電流行為會呈現雙極效應。除此之外，穿隧電流與熱電位間遵循熱電的冷次定律。回收效率的最大值傾向發生於三顆串接耦合量子點系統處於軌道空態的情形，但效率容易受到冷端溫度及溫度差的影響。量子點間距影響電子的躍遷強度，使得效率會在特定條件達到最大值。然而，因量子點尺寸大小相異形成的量子點能階不均勻，使得效率大幅降低。即便量子點不均勻對回收效率影響甚劇，但可利用此製作新穎的熱電元件：溫差驅動之電流二極體。在非線性響應區間之下，階梯狀分布的量子點能階可產生具方向性的電流行為。若以整流率為基準判斷元件的優劣，經由調控量子點之間的距離以及尺寸大小，可以提升二極體的整流率，達到元件的最佳化設計。

摘要(英)

The nonlinear transport properties of serially coupled triple quantum dots system (SCTQD) connected to the metallic electrodes is theoretically investigated in the Coulomb blockade regime for the application of energy harvesting engines (EHE). The thermal-induced voltage is solved self-consistently. Electron currents driven by a temperature difference shows the bipolar oscillatory behavior with respect to QD energy levels. The maximum efficiency of EHE occurs for SCTQD in the orbital depletion situation rather than electron orbital-filling situation. The efficiency of EHE increases with increasing a temperature-bias. In addition, we have investigated how the efficiency of EHE is influenced by the electron- hopping strengths, and QD energy level fluctuations (QDELF). Despite, the efficiency of EHE is seriously suppressed by QDELF, which is useful to design an electron diode driven by a temperature bias. We find that a SCTQD with staircase energy level structures shows the direction-dependent currents derived by a temperature bias.

關鍵字(中)

★ 量子點
★ 熱電元件
★ 熱引擎
★ 轉換效率

關鍵字(英)

論文目次

摘要 i
Abstract ii
致謝 iii
目錄 v
圖目錄 vii
表目錄 x
第一章、導論 1
1-1前言 1
1-2 熱電效應簡介 1
1-3 文獻回顧 3
1-4 研究動機 5
第二章、串接耦合量子點能源回收系統的理論模型 6
2-1 前言 6
2-2 理論模型 7
2.2.1 系統電子總能 8
2.2.2 穿隧電流與熱流 9
2.2.3 電子傳輸係數 10
2.2.4 系統的能源回收效率 11
第三章、串接耦合量子點能源回收系統之回收效率分析 13
3-1 前言 13
3-2 串接耦合量子點系統的溫差驅動電流與電壓驅動電流分析 14
3-3在調變不同冷端溫度條件下之系統回收效率分析 18
3-4 在調變不同溫差條件下之系統回收效率分析 21
3-5 在調變不同電子躍遷強度下之系統回收效率分析 24
3-6 量子點能階不均勻的情形下之系統回收效率分析 27
第四章、串接耦合量子點系統熱二極體整流效率分析 32
4-1 前言 32
4-2串接耦合量子點系統在非線性響應區間下之電流與熱電位 33
4-3 串接耦合量子點系統電流整流效率分析 36
第五章、結論 40
參考文獻 41

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指導教授

郭明庭

審核日期

2016-7-14

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