有機半導體材料相較於無機半導體具有製程步驟較簡易和價格較低等優勢，且元件效率也已到達可量產階段，近年來發展快速。若材料傳輸特性極佳，又
同時具有雙極性載子傳輸能力，即可減少元件製程及提高元件效率。以載子傳輸的角度而言，由於盤狀液晶半導體材料具有較高的載子遷移率，目前有潛力應用於許多新型的光電元件。例如有機發光二極體、太陽能電池、有機半導體等等。
聚合物穩定液晶結構薄膜(Polymer-stabilized Liqual Crystal，簡稱PSLC)是近年來廣為探討的液晶元件之一[1]。許多研究將聚合物添加於具有藍相的膽固醇液晶中，並於藍相溫度照UV光進行聚合作用，來穩定藍相晶格結構使其藍相溫度範圍變長。
本研究目的為探討盤狀液晶於不同溫度電場下的載子傳輸能力變化及其可能的物理機制，並進一步探討摻雜聚合物後對分子的排列情形和載子遷移率之影響。本論文使用的盤狀液晶材料為2,3,6,7,11,12-hexaoctyloxydibenzo[a,c]phenazine (HDBP-3)。本研究發現此盤狀液晶(HDBP-3)在液晶態區間中，溫度改變時盤狀液晶的柱狀結構會隨著變化，我們希望利用聚合物枝條來穩定盤狀液晶之柱狀結構，進而可達成改善載子傳輸特性之目的。且其載子遷移率亦會因溫度降低而降低，可藉由能量雜亂度和位置雜亂度來探討，此外盤狀液晶分子柱軸方向將隨溫度降低而越趨傾斜。本研究接著加入不同濃度的聚合物，來穩定盤狀液晶柱狀結構，發現濃度5wt%以上可以改善柱軸傾斜現象，使HDBP-3的載子遷移率更趨向不受溫度影響(temperature-independence) 。

Organic semiconductors have been grown rapidly in recent years due to lots of advantages compared to inorganic semiconductors such as simple manufacturing process, low cost and flexibility. Materials with excellent bipolar carrier transport characteristics are essential for both device performance and simplification of device fabrication. Discotic liquid crystals (DLCs) are good candidates for bipolar carrier transpoters because of the high carrier mobilities induced by their columnar structures. The potential of the DLCs in the applications of optoelectrical devices such as organic light-emitting diodes (OLED), photovoltaic devices (OPV) and organic field-effect transistors (OFET) has been demonstrated recently.
In this thesis, the temperature dependence of charge transport and arrangement of molecules of a discotic liquid crystal, named as HDBP-3, was investigated. Both the carrier mobilites and the conoscopic images supports the tilting of the columnar structure in the DLC under low temperature. Polymer liquid crystal was then used to stabilize the columnar structure of the DLC. The effect of the concentration of the polymer liquid crystal on carrier mobility and molecular arrangement are discussed.

中文論文審定書 i
英文論文審定書 ii
致謝 iii
摘要 iv
Abstract v
目錄 vi
圖次 viii
表次 x
第一章 緒論 1
1.1盤狀液晶的分類介紹 1
1.1.1 向列型盤狀液晶 1
1.1.2 管柱型盤狀液晶 1
1.2 盤狀液晶的應用 2
1.3高分子液晶的介紹 6
1.4 研究動機 8
第二章 實驗方法 11
2.1 材料介紹 11
2.1.1 HDBP-3材料介紹 11
2.1.2 RM257材料介紹 15
2.2 飛行時間(time-of-flight)量測法 16
2.2.1 原理機制 16
2.2.2 訊號分析 17
2.2.3 元件製備 21
2.2.4實驗架構 25
2.3 Poole-Frankle Effect 26
2.3.1非晶態分子系統 26
2.3.1.1一維分子系統 29
第三章 研究結果與討論 31
3.1 HDBP-3載子遷移率對電場和溫度的效應 31
3.2 摻雜不同濃度的聚合物對盤狀液晶柱狀結構的影響 36
3.3 HDBP-3摻雜RM257對載子遷移率影響 41
第四章 結論 53
第五章 參考文獻 54

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