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| 研究生： |
葉宏建 Yeh, Hong-Jian |
|---|---|
| 論文名稱： |
氟化鋰薄膜在五環素有機薄膜電晶體之影響 The Effect of An Ultra-thin Lithium Fluoride Film on Pentacene-Based Organic Thin Film Transistors |
| 指導教授： |
王永和
Wang, Yeong-Her |
| 學位類別： |
碩士 Master |
| 系所名稱： |
電機資訊學院 - 電機工程學系 Department of Electrical Engineering |
| 論文出版年： | 2007 |
| 畢業學年度： | 95 |
| 語文別： | 英文 |
| 論文頁數： | 86 |
| 中文關鍵詞： | 有機電激發光二極體 、有機薄膜電晶體 、伍環素 、銦錫氧化物 、共軛高分子 |
| 外文關鍵詞： | ITO, PDPA, PDDA, PVP, SiO2, conjugated polymer, organic light emitting diode, LiF, pentacene, organic thin film transistor |
| 相關次數： | 點閱：95 下載：1 |
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本論文中我們所製作與研究之有機薄膜電晶體包含兩部份，分別各是以有機高分子poly-diallyldimethylammonium chloride (PDDA) 及Poly-diphenylamine (PDPA) 與小分子五環素 (pentacene) 作為其主動層，以往二氧化矽常見被作為介電層，在此我們將介電層也改用有機材料poly(4-vinylphenol)，銦錫氧化物 (ITO) 因導電性佳及其為透明之特性，故選用作為閘極電極。
第一部份因為五環素是現今作為有機薄膜電晶體特性最穩定的小分子材料，另外，超薄的氟化鋰薄膜被使用在有機電激發光二極體之中以改善載子注入的效率，在此我們將之成膜應用於閘極電極與介電層之間，當氟化鋰薄膜為5奈米時發現電流開關比 (106) 有相當明顯的改進；我們以電晶體移除主動層的結構來製作電容器以瞭解鋰化氟厚度對電容值的影響，其電容值的變化趨勢相似於五環素薄膜電晶體”開”、”關”狀態的汲極電流及開關電流比。
第二部份，我們利用PDDA藉由閘極偏壓來控制PDPA被離子摻雜與否的機制研製雙層主動層式的共軛高分子有機薄膜電晶體。
Organic thin film transistors based on conjugated polymer such as poly-diallyldimethylammonium chloride (PDDA) / Poly-diphenylamine (PDPA) and small molecule such as pentacene. Poly(4-vinylphenol) are investigated as a dielectric material instead of SiO2. ITO glass as gate electrodes due to its conductivity as well as transparent properties is applied to the transistor fabrication.
Until now, the performance of pentacene-based organic thin film transistors is the most widely studied. A lithium fluoride (LiF) thin film has been used in organic light emitting diodes to improve the efficiency of the carrier injection. Here, we deposit an ultra-thin LiF film between gate electrode and dielectric layer in pentacene-based OTFTs. The on/off current ratio (up to 106) is obviously improved as thickness of the LiF film is approximately 5.0 nm. The mechanisms are also studied. By removing the active layer from pentacene-based OTFTs to fabricate capacitors, the capacitance trend is similar to the drain current at on-state and off-state regions as well as on/off current ratio.
In the second part, anions of PDDA can be doped into PDPA through applying a negative bias in order to modulate the conductivity of PDPA. As a result of this mechanism, the PDPA/PDDA bilayer is employed as an active semiconductor layer to demonstrate conjugated polymer OTFTs.
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校內：2010-07-27公開校外：2011-07-27公開