紋理鋸齒型石墨烯奈米帶的熱電特性

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馮耕豪(Geng-Hao Feng) 查詢紙本館藏

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電機工程學系

論文名稱

紋理鋸齒型石墨烯奈米帶的熱電特性

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摘要(中)

紋理鋸齒型石墨烯奈米帶(t-ZGNRs)的熱電特性非常特別，其傳輸係數帶有類似於Square Form (SF)傳輸係數的概念，因此值得我們去研究其熱電特性。我們用緊束縛模型(tight-binding mode)的架構來研究t-ZGNRs連接到電極的熱電特性，除了通過調控穿隧率來提高功率因子和熱電優質，還有調控graphene quatum dots (GQDs)的數量來控制GNR迷你帶的寬度及能隙，我們發現紋理鋸齒型石墨烯奈米帶(t-ZGNRs)的功率因子和熱電優質(ZT)的最大值都發生在能帶邊緣，而要有好的功率因子必須電導率、席貝克係數要大，聲子熱導要小，但是也會影響到熱電優質(ZT)，因此如何在這些參數之間取得最佳化，也是我們要面對的問題。

摘要(英)

The thermoelectric properties of textured zigzag graphene nanoribbons (t-ZGNRs) are highly unique. They exhibit a transmission coefficient with a concept similar to Square Form (SF) transmission coefficient, making it worthwhile to research their thermoelectric properties. We utilize the thermoelectric properties of t-ZGNRs connected to electrodes using a tight-binding model framework. In addition to enhancing the power factor (PF) and figure of merit (ZT) by controlling the tunneling rates, we also manipulate the number of graphene quantum dots (GQDs) to control the width and energy gap of GNR minibands. We observe that the maximum values of PF and ZT in t-ZGNRs occur near the band edges. To achieve a high PF, it is essential to have a large electrical conductivity and Seebeck coefficient while minimizing phonon thermal conductivity. However, these factors also affect ZT. Therefore, finding a balance among these parameters is also a challenge we have to face.

關鍵字(中)

★ 紋理鋸齒形石墨烯奈米帶
★ 熱電特性
★ 量子點

關鍵字(英)

論文目次

摘要 I
Abstract II
目錄 III
圖目錄 V
表目錄 VI
第一章、導論 1
1-1前言 1
1-2石墨烯 3
1-3石墨烯奈米帶 4
1-4 研究動機 5
第二章、系統模型和公式推導 6
2.1系統模型建立 6
2-2熱電效應 7
2-3系統電子總能 8
2-4電子流與電子熱流計算 9
2-5熱電係數 10
第三章、熱電特性模擬與分析 12
3-1 ZGNRs與t-ZGNRs的傳輸係數Transmission coefficient比較 12
3-2穿隧率對熱電係數的影響 13
3-3溫度對熱電係數的影響 15
3-4不同尺寸(Na)對熱電係數的影響 17
3-5不同尺寸(Nz)對熱電係數的影響 19
第四章、結論 21
參考文獻 22

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指導教授

郭明庭(Ming-Ting Kuo)

審核日期

2023-6-12

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