金屬氧化物熱電材料之製程開發及模組研究

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姓名

蕭仁澤(Jen-Che Hsiao) 查詢紙本館藏

畢業系所

電機工程學系

論文名稱

金屬氧化物熱電材料之製程開發及模組研究
(Process Innovation and Module Development of Metal Oxide Thermoelectric Materials)

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摘要(中)

熱電材料廣泛的用途，及其綠色能源永續發展的特性，逐漸成為目前主流趨勢。隨著技術發展成熟，熱電發電機轉換效率也在提升，如鋼鐵、水泥等製造業，也以廢熱進行發電。
氧化物半導體的熱穩定性及化學穩定性，使其成為適合的熱電材料，且研究指出奈米結構的特性可以降低熱導，進而提高ZT值。
本論文研究對象為N型半導體材料，主要使用材料為氧化銦，再透過添加二氧化鈰、鋅以及二氧化矽等，量測其作為熱電元件的可能性。我們發現以4at%比例的二氧化鈰添加至氧化銦，其熱電特性較為優秀，也較為穩定。選定較佳的材料後，開始模組的製作，並量測其發電功率。雖然本實驗成功製做出模組，但其功率及結構性並不如預期，整體結構不夠穩固，且整體電阻值過高，導致發電功率較低，希望能以此實驗為基石，在往後能尋找更合適之方法來改善目前問題，以研發出高轉換效率之熱電模組。

摘要(英)

Thermoelectric (TE) materials are promising candidates for many applications, including thermopiles, thermal sensors, and TE cooler for laser diodes. The performance of a TE device is characterized by the figure of merit (ZT). Oxide semiconductors are regarded as the potential candidates for high-temperature TE applications due to thermal and chemical stability in ambient condition at high temperature. Theoretical calculations and experimental results suggest that ZT can be enhanced in nanostructured materials. It has been reported that In_2 O_3-based ceramics are with high power factors, and the ZT value of In_2 O_3-based ceramics can be effectively improved by reducing the thermal conductivity.
In this work, the TE properties of In_2 O_3 doped with Zn and CeO_2 have been investigated. The powders composition were designed as In_1.92 Ce_0.08 O_3 and In1.96Zn0.04O3. These thermoelectric materials were employed to fabricate a thermoelectric module for power generation.
In the future work, an enhanced ZT value and contact material are needed for high-temperature TE modules.

關鍵字(中)

★ 熱電材料
★ 氧化銦
★ 模組
★ 熱電優質

關鍵字(英)

★ Thermoelectric materials
★ Indium oxide
★ Module
★ ZT

論文目次

目錄
摘要....................................................I
Abstract...............................................II
誌謝..................................................III
目錄...................................................IV
圖目錄.................................................VI
第一章緒論..............................................1
1-1 前言............................................1
1-2 熱電歷史.........................................2
1-3 熱電材料未來開發與趨勢............................2
1-4 研究動機.........................................3
第二章基礎理論..........................................4
2-1 熱電效應.........................................4
2-2 熱電轉換效率及熱電優質............................6
2-3 氧化銦之添加.....................................8
2-4 冷壓法..........................................8
2-5 高溫燒結.........................................8
第三章實驗流程與儀器設備................................10
3-1 實驗流程........................................10
3-2 實驗方法........................................11
3-3 實驗量測介紹....................................17
3-4 實驗儀器介紹....................................22
第四章實驗結果分析與討論................................24
4-1 前言...........................................24
4-2 CeO2、Zn、In2O3製程參數與塊材量測................24
4-3 SiO2、CeO2、Zn、In2O3製程參數與塊材量測..........25
4-4 熱電特性比較....................................26
4-5 高溫熱電特性比較................................33
4-6 SEM圖..........................................36
4-7 XRD圖..........................................39
4-8 模組量測........................................41
4-9 模組討論........................................45
4-10 結論與未來展望.................................46
參考文獻................................................47

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指導教授

辛正倫(Cheng-Lun Hsin)

審核日期

2019-7-18

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