臺灣博碩士論文加值系統

本研究利用電流輔助熱壓處理製作In-plane可撓式熱電薄膜發電元件。製程中使用p與n型三元碲化鉍系熱電材料，並以平均粒徑5μm之粉末刮塗製備150μm熱電薄膜，接續利用電流輔助熱壓處理及塗佈PU複合塗膜分別改善薄膜熱電性質和元件熱傳，藉此提升元件最大輸出功率。實驗結果顯示，操作條件在熱壓溫度330℃、熱壓壓力137MPa、前段熱壓時間(t1) 3分鐘、後段電流輔助熱壓(t2) 7分鐘以及電流密度800A/cm2時，當溫差為25℃時，熱電發電元件之開路電壓、短路電流及最大輸出功率，分別為22.41mV、419.55μA、2351.52nW，與熱壓處理製備相較下，短路電流及最大輸出功率分別有效提升55.11%、47.8%。經PU複合塗膜作為絕緣保護層後，熱端固定在50℃時，元件最大輸出功率由1976.36上升至2163.91nW，與無添加塗膜相比提升9.5%；而在曲率半徑6cm時，元件電阻由60.55Ω下降至9.96Ω，下降約為83.5%，且在曲率半徑10cm下撓曲次數從67次提升至650次，提升約8.3倍。

The objective of this research is to fabricate the planar flexible thermoelectric generator by current-assisted hot pressing treatment. The thermoelectric materials are bismuth telluride based ternary compounds in the procedure. The thermoelectric thin films are prepared via coating method with an average particle size of 5 μm powders. After that, the current-assisted hot pressing treatment is employed and the PU compostie films are coated to improve the thermoelectric properties of the films and the heat transfer inside the generator. In the hope of the maximum output power of the generator will be further enhanced. Under the following operating condition: hot pressing temperature at 330℃, pressure of 137MPa , hot pressing time (t1) 3min, current assisted hot pressing time (t2) 7min and current density 800 A/cm2, the results show that the open circuit voltage, short circuit current and maximum output power of 3 pairs of p-n thermoelectric generator are 22.41mV, 419.55μA and 2351.52 nW, respectively under the temperature difference 25℃, Compared to only hot pressing treatment, the open circuit voltage of the generator do not change significantly while the short circuit current and the maximum output power increased by 55.11% and 47.8%, respectively.
When the PU composite films are used as the insulation protective layer, the maximum output power increased from 1976.36 to 2163.91nW which was 9.5% higher than non-added PU composite film under the hot side fixed at 50℃. The resistance of the generator dropped from 60.55Ω to 9.96Ω, a drop of 83.5%, under the 6cm bending radius. The bending cycle increased from 67 to 650, a great increase of 8.3 times, under the 10cm bending radius.

中文摘要 I
Abstract II
目錄 IV
圖目錄 IX
表目錄 XIV
第一章 緒論 1
第二章 文獻回顧 3
2.1引言 3
2.2熱電材料種類 4
2.3熱電優值 5
2.4熱電發電元件種類 7
2.4.1 Cross-plane型熱電發電元件 7
2.4.2 In-plane 型熱電發電元件 8
2.4.3 Transverse型熱電發電元件 9
2.5元件效能評估 10
2.5.1最大輸出功率及功率密度 10
2.5.2元件轉換效率 12
2.6 In-plane型可撓熱電發電元件 13
2.7元件製作方式 17
2.8粉末熱壓法 21
2.8.1晶界影響 22
2.9電流輔助熱壓 24
2.9.1電流熱效應 24
2.9.2 電驅動力 25
2.10電極與熱電偶臂連接方法 27
2.11元件基材特性 29
2.12元件保護層特性 33
2.12.1元件撓曲性質測試 35
2.13元件熱傳改善 36
2.14研究目的 39
第三章 實驗方法與步驟 40
3.1實驗藥品與儀器 40
3.1.1實驗藥品 40
3.1.2實驗儀器設備 41
3.2分析儀器與原理 43
3.3實驗架構 45
3.4 實驗前段： 46
3.4.1前處理 46
3.4.2 後處理 50
3.4.3 反應曲面法 52
3.5 實驗中段 53
3.5.1 熱電發電元件之設計 53
3.5.2元件最佳操作條件 54
3.5.3 前處理 56
3.5.4 In-plane熱電發電元件前處理製作之流程 56
3.5.5 後處理 58
3.5.6 電性量測 58
3.6實驗後段 60
3.6.1前處理 60
3.6.2元件電性量測 64
3.6.3元件機械及疲勞性質測試 64
第四章 結果與討論 66
4.1電流輔助熱壓處理n-type Bi2Se0.3Te2.7試片之性質影響 67
4.1.1不同電流密度對電阻率的影響 67
4.1.2 不同電流密度對載子濃度及遷移率的影響 71
4.1.3 不同電流密度對Seebeck係數的影響 74
4.1.4 不同電流密度對power factor的影響 76
4.1.5 Power Factor 最適化 77
4.2 電流輔助熱壓製備熱電元件參數最適化 80
4.3電流輔助熱壓處理熱電發電元件之電訊分析 83
4.4有無電流輔助處理製備熱電發電元件之電訊分析比較 88
4.5 保護層對元件電性之影響 92
4.5.1 開路電壓 92
4.5.2短路電流與最大輸出功率 94
4.6 元件機械及疲勞性質試驗 97
4.6.1元件機械性質測試 97
4.6.2元件疲勞性質測試 100
第五章 結論與未來展望 104
5.1結論 104
5.2未來展望 105
參考文獻 106

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