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研究生： 謝長諺
Chang-Yan Hsieh
論文名稱： 帶狀有限二維量子點陣列的熱電性質
Thermoelectric properties of finite two-dimensional quantum dot arrays with band-like electronic states
指導教授： 郭明庭
Ming-Ting Kuo
口試委員:
學位類別： 碩士
Master
系所名稱： 資訊電機學院 - 電機工程學系
Department of Electrical Engineering
論文出版年： 2021
畢業學年度： 109
語文別： 中文
論文頁數： 34
中文關鍵詞： 熱電材料 、二維 、量子點陣列 、熱電優質
外文關鍵詞： Thermoelectric material, two-dimensional, quantum dot arrays, ZT
相關次數： 點閱：8  下載：0 
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    • 功率因數(PF=S^2 G_e)取決於塞貝克係數(S)和電子電導(G_e)。G_e的增強將不可避免地抑制S，因為它們密切相關，所以，PF的優化非常困難。在這裡，我們從理論上研究了帶有從電極注入的載子的二維量子點(QD)陣列的熱電特性，共振穿隧過程中的二維量子點陣列的Lorenz數滿足Wiedemann-Franz定律，此定律證實了微帶的形成。當微帶中心遠離電極的費米能階時，電子傳輸將在熱電子輔助穿隧過程(TATP)中進行，在這種情況下，帶狀情況下的G_e和原子狀情況下的S可以同時發生。我們透過本文證明，隨著電子態數量的增加，G_e的增強不會抑制TATP中的S。

    The thermal power (PF=S^2 G_e) depends on the Seebeck coefficient (S) and electron conductance (G_e). The enhancement of G_e will unavoidably suppress S because they are closely related. As a consequence, the optimization of PF is extremely difficult. Here, we theoretically investigated the thermoelectric properties of two-dimensional quantum dot (QD) arrays with carriers injected from electrodes. The Lorenz number of 2D QD arrays in the resonant tunneling procedure satisfies the Wiedemann-Franz law, which confirms the formation of minibands. When the miniband center is far away from the Fermi level of the electrodes, the electron transport is in the thermionic-assisted tunneling procedure (TATP). In this regime, G_e in band-like situation and S in atom-like situation can happen simultaneously. We have demonstrated that the enhancement of G_e with an increasing number of electronic states will not suppress S in the TATP.

    摘要 I Abstract II 目錄 III 圖目錄 IV 表目錄 IV 第一章、導論 1 1-1:前言 1 1-2:熱電效應(Thermoelectric effect) 2 (1)席貝克效應(Seebeck effect) 2 (2)帕爾帖效應(Peltier effect) 4 (3)熱電優值(Figure of merit) 5 1-3:文獻回顧 6 1-4:研究動機 7 第二章、系統模型與公式推導 8 2-1:一維量子點奈米線 8 2-2:二維量子點奈米線陣列 9 2-3系統電子總能 11 2-4格林函數分析與電子傳輸係數 12 第三章、熱電轉換特性模擬與分析 14 3-1二維量子點陣列之電子傳輸特性 14 3-2-1穿隧律對熱電特性的影響 16 3-2-2溫度變化對熱電特性的影響 18 3-3電子躍遷強度對熱電特性的影響 19 第四章、結論 23 參考文獻 24

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