二維量子點陣列的熱二極體

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姓名

戴立言(Li-Yen Tai) 查詢紙本館藏

畢業系所

電機工程學系

論文名稱

二維量子點陣列的熱二極體
(Thermal diodes made of 2-D quantum dot arrays)

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摘要(中)

為了得到良好的熱整流特性，許多科學家在低維度的系統下研究熱二極體。為了能作為實際應用，本論文探討了非線性響應下二維量子點超晶格奈米線(SLNWs)陣列的熱二極體性質。我們使用非平衡態格林函數的方法研究連接電極的超晶格奈米線陣列的傳輸特性。驗證了在不對稱量子點能階排列的超晶格奈米線陣列中可以觀察到電子熱整流現象。超晶格奈米線陣列的熱二極體特性歸因於隨著溫差的方向而有大小變化的傳輸係數。電子熱流分別在順向溫度偏壓和逆向溫度偏壓顯現了熱導體和熱絕緣體的特徵。本論文闡明了二維量子點系統中y方向電子躍遷強度對熱二極體系統的影響。我們也發現到熱離子輔助穿隧程序(TATP)對觀察到本系統的電子熱整流效應有著顯著的影響。

摘要(英)

In order to get a high heat rectification ratio, many scientists studied heat diodes in low-dimensional systems. For realistic applications , we investigated the nonlinear electron heat transport in 2-D quantum dot (QD) superlattice nanowires (SLNWs) arrays in this thesis. The nonequilibrium Green-functions technique is used to study the transport properties of an SLNW array junction coupled to the metallic electrodes. It is demonstrated that the electron heat rectification can be observed in an SLNWs array with asymmetrical alignment of energy levels in QDs. The SLNWs arrays show the functionality of heat diodes, which is mainly attributed to a transmission coefficient with a temperature-bias direction dependent characteristic. Electron heat current shows the features of thermal conductors and thermal insulators under the forward temperature bias and reverse temperature bias, respectively. This thesis clarifies the effects of the electron hopping strength in the y direction on electron heat currents. We also find the thermionically-assisted tunneling procedure plays a remarkable role in observing electron heat rectification of such a junction system.

關鍵字(中)

★ 熱二極體
★ 量子點陣列
★ 量子點奈米線

關鍵字(英)

★ heat diodes
★ quantum dot arrays
★ quantum dot nanowires

論文目次

摘要 i
Abstract ii
圖目錄 v
表目錄 vii
第一章、導論 1
1-1 前言 1
1-2 熱流二極體簡介 2
1-3 文獻回顧 4
1-4 研究動機 5
第二章、系統模型與公式推導 6
2-1 二維量子點陣列系統 6
2-2 系統電子總能 7
2-3 電子流與電子熱流 9
2-4 電子傳輸係數 11
第三章、二維熱二極體系統特性分析 12
3-1 前言 12
3-2 系統溫差對電子熱流及熱整流率之影響 13
3-3 量子點間能階差對熱整流效率的影響 14
3-4 縱向電子躍遷強度對系統的影響 17
3-5 熱離子輔助穿隧對系統的影響 19
第四章、結論 21
附錄 22
參考文獻 26

參考文獻

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指導教授

郭明庭(Ming-Ting Kuo)

審核日期

2020-7-8

推文