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研究生(外文):Cheng-Chang Wu
論文名稱(外文):Exploring the Relationship between the Thickness of the Tribo-dielectric Layer and Efficiency of a Triboelectric Nanogenerator
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隨著人類對能源的需求逐年增加,人們近年來不停地尋找各種替代能源,例如:太陽能、風能、潮汐能、地熱能和生質能。然而,即使有這些再生能源的出現與開發,仍無法成為現今人類消耗大量能量的主要來源。因此,一種藉由奈米科技用於儲存能量的新技術就被發展起來,那就是奈米發電機(nanogenerators)。奈米發電機中,最具有發展潛力的就是由喬治亞理工提出的摩擦式奈米發電機(triboelectric nanogenerators, Tengs),它自2012年興起,至今是個新興且熱門的研究領域。
為了增加摩擦式奈米元件的輸出功率,我們可以從許多不同的面向著手,像是可以從電極以及摩擦介電層(tribo-dielectric layer, TDL)加入微結構,或是改變微結構的形狀或尺寸,都可以增加元件的效能。而這篇論文探討的是:摩擦介電層的厚度與元件的開路電壓(open-circuit voltage)以及短路電流(short-circuit current)之間的關係。相較於傳統的靜態模型,當摩擦介電層的厚度極薄時,以動態模型更能符合元件的輸出結果,同時也引進了一個材料參數,那就是動態模型中,在摩擦介電層附近的電子電洞再結合的比率r。透過數學算式的推導,可得到短路電流與摩擦介電層的厚度d是有關的,而開路電壓卻是無關的。此外,可以發現在某個特定的厚度值(dmax)時,會有最佳的電流值(Imax),且隨著材料的r值增加,Imax會隨之減少而dmax卻隨之增加。
As the human demand for energy has increased year by year, people are constantly looking for alternative energy sources such as solar energy, wind energy, tidal energy, geothermal energy, and biomass energy recently. However, even with the emergence and development of these renewable energy sources, it is still unable to become a large amount of energy consumed by humans today. Therefore, there is a new technique developed for harvesting the energy by nano-technique called nanogenerator. One of the potential nanogenerators is triboelectric nanogenerators (Tengs), which is proposed by Georgia Tech. and has emerged since 2012 and that is still an emerging and popular research area.
In order to improve the output performance of Tengs, we can try at different aspects. For example, building up microstructure in electrode and tribo-dielectric layer (TDL) or changing the shape or size of microstructure can both increase the efficiency of Tengs. This article talks about the relationship between the thickness of TDL and open-circuit voltage or short-circuit current of a teng. Compared with static model, the dynamic model is more suitable for the output of tengs with ultra-thin thickness of TDL and we introduce one material parameter, i.e. electron-hole recombination rate (r) near the TDL in our developed dynamic model. By mathematical method, it can be derived that short-circuit current is dependent with different thickness of TDL, but open-circuit voltage is not. Furthermore, it can be found that there is a maximum current (Imax) at certain value of thickness (dmax), and the larger value of r in the material results in the smaller value of Imax and the larger value of dmax.
Finally, the experimental data and the theoretical dynamic model agree very well with each other and find out the value of r not only for polydimethylsiloxane (PDMS) as TDL but also for other foreign experimental data.
國立臺灣大學碩(博)士學位論文切結書 Declaration of Originality i
口試委員審定書 ii
致謝 iii
中文摘要 iv
目錄 vii
圖目錄 x
表目錄 xiii
第一章 緒論 1
1.1 前言 1
1.2 研究背景與動機 2
1.3 論文架構 5
第二章 文獻回顧與理論基礎 6
2.1 歷史發展 6
2.1.1 壓電效應的發現 6
2.1.2 壓電元件的出現 7
2.1.3 以摩擦電效應的方式製造奈米元件 8
2.2 摩擦式奈米元件運作原理 10
2.2.1 摩擦起電之原理 10
2.2.2 摩擦式奈米元件運作原理 14
2.3 國際發展現況 16
2.3.1 喬治亞理工 16
2.3.2 韓國KAIST團隊 20
2.3.3 清華大學 22
2.3.4 中興大學 23
2.3.5 台灣大學 24
2.4 研究目的 26
第三章 理論計算與分析 29
3.1 靜態模型的基礎 29
3.1.1 開路電壓的推導 30
3.1.2 短路電流的推導 31
3.2 動態模型的修正 33
3.3 參數“r”的物理意義 37
第四章 實驗方法與量測架設 38
4.1 實驗流程設計 38
4.2 電極製備 39
4.2.1 切片與震洗 40
4.2.2 電子槍蒸鍍系統鍍膜 41
4.2.3 光刻技術與剝離 45
4.3 PDMS製備 50
4.3.1 調配PDMS 51
4.3.2 塗佈與固化PDMS 52
4.3.3 建立PDMS薄膜資料系統 53
4.4 外部零件製備與元件組裝 55
4.5 元件量測 56
4.6 實驗預期結果 58
第五章 實驗結果與討論 59
5.1 開路電壓(Voc)量測結果 60
5.2 短路電流(Isc)量測結果 62
5.3 元件效能分析 65
第六章 總結 67
參考文獻 68
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