量子點超晶格奈米線在熱引擎的應用

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姓名

曾敍哲(Hsu-Che Tseng) 查詢紙本館藏

畢業系所

電機工程學系

論文名稱

量子點超晶格奈米線在熱引擎的應用
(Quantum dot superlattice nanowire heat engines)

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摘要(中)

本論文探討一維的量子點超晶格奈米線系統應用在熱引擎的分析。由於超晶格奈米線會降低聲子熱導，在能量收集的應用中極具潛能，但是許多的研究都是關於相同能階的奈米線，而且不考慮負載效應，在這裡我們提出了一種階梯式能階的超晶格奈米線應用在熱引擎，並且考慮負載的感應熱電壓，利用非線性席貝克效應控制奈米線中的非對稱能階排列，讓通道在順偏時傾向共振狀態，在逆偏時則具有非共振狀態，使其具有與方向相依的輸出功率及熱電流。在這種機制下，發現階梯式能階超晶格奈米線的功率輸出及效率都會優於相同能階的超晶格奈米線。除此之外，熱引擎也具有熱二極體的功能，可以表現出顯著的熱整流比率，而在開路條件中會發現負微分熱導的現象，有利應用於熱電邏輯電路及熱電電晶體。

摘要(英)

This paper discussed the one-dimensional quantum dot superlattice nanowire(SLNW) heat engine(HE) due to reduction of the phonon thermal conductance.Many efforts have been devoted to the SLNW with uniform energy level and neglect the external loading effect. Here we propose a heat engine made of SLNW with staircase-like quantum dot energy levels and consider the induced thermal voltage of the load.The nonlinear Seebeck effect is used to control the alignment energy level in the nanowire and allow resonant electron transport under forward temperature bias, while they are in off-resonant regime under reverse temperature bias. Under this mechanism, the power output and efficiency of such a SLNW are better than SLNWs with uniform QD energy levels. In addition, the HE has the the functionality of a heat diode with impressive negative differential thermal conductance under open circuit condition, which is beneficial to thermoelectric logic circuits and thermoelectric transistors.

關鍵字(中)

★ 量子點超晶格奈米線
★ 熱引擎
★ 熱電效應

關鍵字(英)

★ Quantum dot superlattice nanowire
★ heat engines
★ thermoelectric

論文目次

摘要 i
Abstract ii
目錄 iii
圖目錄 v
表目錄 vii
第一章、導論 1
1.1 前言 1
1.2 熱電效應及熱引擎效率 1
1.3 研究動機 4
第二章、系統模型與公式推導 5
2.1 系統模型 5
2.2 系統參數 8
2.3 穿隧電流及電子熱流 9
2.4 電子傳輸係數 10
2.5 聲子熱流 12
第三章、熱引擎系統特性與分析 13
3.1 前言 13
3.2 溫差變化及不同能階分布對於效率的影響 14
3.3 聲子熱流對於效率的影響 19
3.4 一維系統的開路熱電性質探討 20
3.5 熱離子輔助穿隧對電子熱流及熱整流比率的影響 24
第四章、結論 26
參考文獻 27

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