臺灣博碩士論文加值系統

Regioregular Poly(3-hexythiophene)，簡稱RR-P3HT(高度立體規則度聚(3-己烷基噻吩)是目前常用的高分子有機薄膜半導體材料。本論文利用噴印的方式製作半導體層，噴印製程比旋轉塗佈製程能讓高分子有機半導體有較長的時間排列分子結構，而獲得較佳之電特性。
利用聚亞醯胺薄膜(polyimide；簡稱PI)作為配向層(alignment layer)與修飾層(modification layer)。PI改善了半導體層與絕緣層之接觸狀況(morphology)並提供P3HT分子排列之效果。
由電性指出RR-P3HT分子在與紫外光偏極化方向平行的方向上有較佳的排列性。利用拉曼振動光譜，亦發現與極化方向平行之方向的RR-P3HT有效共軛鏈長度較長，使其電特性較好。且由於偏壓應力之關係，更增加RR-P3HT鍵間之交互作用力，並使其產生異向性，平行電場方向的增強幅度大於垂直電場方向。

Abstract
Regioregular poly(3-hexythiophene) (P3HT) films, prepared by inkjet-printing methods, have been studied using micro-Raman spectroscopy. Organic thin-film transistors (OTFTs) were fabricated on a p-type silicon substrate, using an active layer of highly ordered P3HT polymer, being inkjet-printed in glove box filled with highly purified nitrogen. P3HT film was aligned using the photoaligned polyimide method, which is usually employed to align liquid crystals. Improved field-effect mobility, in the range 5.78´10-3 to 1.33´10-2 cm2/Vs, was obtained in P3HT-based OTFTs with photoaligned polyimide layers, in which the polymer chains of P3HT were aligned parallel to the direction of the transport of the carriers and the polarization of UV light. The thin-film structures of P3HT on the photoaligned polyimide surface depend on the dose of UV light that irradiates on the polyimide surface. Mobility of P3HT-based OTFTs with the photoalignment layer was enhanced by a factor of around 10 times when compared to that without alignment layer. The improved mobility was attributed to longer effective conjugation length of P3HT chains aligned by photoaligned polyimide in inkjet-printing P3HT films as suggested by their microRaman spectroscopy.

目次

目次 I
表目錄 III
圖目錄 IV
摘要 VII
Abstract IX
致謝 X
第1章 簡介 1
1.1 有機半導體(organic semiconductor) 1
1.2 有機薄膜電晶體(Organic thin-film transistors；OTFTs) 5
1.2.1 元件構造 6
1.2.2 原理 7
1.2.3 有機薄膜電晶體的基本公式及特性 9
1.3 論文目的 12
第2章 P3HT有機薄膜電晶體之元件設計 23
2.1 前言 23
2.2 實驗方法 24
2.2.1 有機材料 24
2.2.2 樣品設計 24
2.2.3 樣品製作 28
2.3 實驗儀器 30
第3章 P3HT有機薄膜電晶體元件電性分析 47
3.1 前言 47
3.2 元件製作 47
3.3 分析 49
3.3.1 電性分析 49
3.3.2 拉曼分析 51
第4章 結論與未來研究方向 78
參考文獻 81

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