有限長度石墨烯奈米帶之熱電特性;扶手形邊界與電極耦合

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姓名

戴君瑋(Jun-Wei Dai) 查詢紙本館藏

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電機工程學系

論文名稱

有限長度石墨烯奈米帶之熱電特性;扶手形邊界與電極耦合

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★ 分子電晶體之穿隧電流與熱電效應	★ 串接耦合量子點之熱電特性

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摘要(中)

石墨烯是一種二維材料，擁有良好的導電性和導熱性，並被廣泛研究應用。石墨烯奈米帶是一種引領至準一維領域的石墨烯衍生物，其在量子侷限效應的作用下展現出別於過往材料的熱電特性，因此被視為潛在的高效率熱電材料。本論文探討了有限長度的石墨烯奈米帶，並以電極線接觸扶手形邊緣(Armchair edge)來提供載子，研究其奈米帶及鋸齒型邊緣(Zigzag edge)對電子傳導性的影響。我們通過改變溫度、奈米帶長寬以及接觸電極使用的金屬材料，來觀察其對石墨烯奈米帶的電導、席貝克係數、功率因子及熱電優值等造成的變化。研究發現，石墨烯奈米帶在不同條件下具有不同的熱電特性，這些特性為其在熱電領域的應用提供了基礎。本研究為進一步了解石墨烯奈米帶在熱電轉換中的機制提供了重要的參考。

摘要(英)

Graphene is a two-dimensional material that has been demonstrated to exhibit excellent electrical and thermal conductivity in previous experiments. Graphene nanoribbons(GNRs), in particular, have led to quasi-one-dimensional systems and, under the influence of quantum confinement effects, hold promise as high-efficiency thermoelectric materials. This study investigates the impact of zigzag edge of GNR contact on the electronic transport of finite-length graphene nanoribbons with armchair edges coupled to electrodes. We have demonstrated the unique thermoelectric properties of the GNRs under various in temperatures, ribbon lengths, widths, and the contacted electrodes. Our find says that we have significant insight on thermoelectric properties of GNRs.

關鍵字(中)

★ 石墨烯奈米帶
★ 熱電特性
★ 扶手形邊界

關鍵字(英)

論文目次

摘要 I
Abstract II
目錄 III
圖目錄 V
第一章、導論 1
1-1前言 1
1-2石墨烯 (Graphene) 2
1-2.1石墨烯奈米帶 (Graphene Nanoribbons) 3
1-3由下而上合成法 (Bottom-Up Approach) 4
1-4研究動機 6
第二章、研究方法與系統模型 7
2-1石墨烯晶格結構 7
2-2漢米爾頓算符(Hamiltonian) 8
2-2.1接觸電極 9
2-3電子傳輸係數與熱電係數 11
第三章、模擬與分析 14
3.1 尺寸對ZGNRs之熱電特性的影響 14
3-2 穿隧率對ZGNRs之熱電特性的影響 16
3.3 溫度對ZGNRs之熱電特性的影響 17
3.4 尺寸對AGNRs之熱電特性的影響 19
3.5 穿隧率對AGNRs之熱電特性的影響 21
第四章、結論 22
參考資料 23

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指導教授

郭明庭(Ming-Ting Kuo)

審核日期

2023-6-9

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