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博碩士論文 etd-0813112-121219 詳細資訊
Title page for etd-0813112-121219
論文名稱
Title
盤狀液晶半導體載子傳輸特性之研究
Study of Charge Transport Properties of Discotic Liquid Crystal Semiconductors
系所名稱
Department
畢業學年期
Year, semester
語文別
Language
學位類別
Degree
頁數
Number of pages
52
研究生
Author
指導教授
Advisor
召集委員
Convenor
口試委員
Advisory Committee
口試日期
Date of Exam
2012-07-26
繳交日期
Date of Submission
2012-08-13
關鍵字
Keywords
載子遷移率、盤狀液晶、液晶排列、液晶配向、飛行時間法
time-of-flight, mobility, discotic liquid crystal, alignment, carrier
統計
Statistics
本論文已被瀏覽 5645 次,被下載 785
The thesis/dissertation has been browsed 5645 times, has been downloaded 785 times.
中文摘要
有機半導體材料有著許多有趣的光電特性,而由於製程步驟較簡易及價格較低且元件效率也到達可量產階段,近年來發展快速,其中以傳輸載子的角度,盤狀液晶為有機材料中載子遷移率最快速材料之一,目前已應用於許多光電元件,例如有機發光二極體、太陽能電池、有機半導體等等。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。
本研究目的為探討盤狀液晶的排列情形對載子遷移率之影響。在本論文中,所使用的盤狀液晶材料為2,3,6,7,11,12-hexaoctyloxydibenzo[a,c]phenazine (HDBP-8)。研究發現藉由控制降溫速度可得到指向一致的分子排列,並探討垂直配向之載子傳輸特性,發現在液晶態區間中,溫度越低,盤狀液晶分子柱軸方向將越趨傾斜,接著探討柱軸方向的傾斜對於載子傳輸之影響,研究結果發現柱軸越趨傾斜,載子遷移率越低,而在良好的垂直排列下,量測出HDBP-8的電子與電洞遷移率高達1×10-3 cm2/Vs,適合應用於光電元件中扮演傳輸載子的角色。
Abstract
Discotic liquid crystals (DLCs), which consist of disk-like molecules, have recently attracted considerable attention for their interesting electronic properties. One of the most significant of DLCs is their high charge carrier mobility in their columnar structure. Recently the number of researches have been increasing on applications such as organic light-emitting diodes (OLED), photovoltaic devices (OPV) and organic field-effect transistors (OFET).
The purpose of the study is to investigate the mobility of different alignment of DLCs. The material used in the present study is HDBP-8. We will show that the stack of DLCs depended on temperature strongly. We will also discuss charge transport properties of homeotropic alignment. Carrier transport has been investigated in the hexagonal columnar (Colh) mesophase of HDBP-8 using time-of-flight (TOF) technique. The carrier mobilities are up to the order of 10-3 cm2V-1s-1 for both positive and negative charges with weak dependence on the electric fields.
目次 Table of Contents
中文論文審定書 i
英文論文審定書 ii
致謝 iii
摘要 iv
Abstrct v
第一章 緒論 1
1-1 盤狀液晶的基本特性 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 文獻回顧 3
1-4 研究動機 4
第二章 實驗方法 7
2-1 HDBP-8 材料介紹 7
2-2 量測元件製備 8
2-2.1 基板清洗 8
2-2.2 黃光製程 8
2-2.3 量測元件結構 9
2-3 飛行時間(time-of-flight)量測法 10
2-3.1 飛行時間法原理機制 10
2-3.2 飛行時間法訊號分析 11
2-3.3 Poole-Frenkel Effect 12
2-3.4 飛行時間法實驗架構 12
2-4 聚光干涉(Conoscopy) 12
第三章 研究結果與討論 21
3-1 降溫速度對於盤狀液晶排列影響 21
3-2 溫度對於盤狀液晶排列傾角影響 22
3-3 電場對於盤狀液晶排列影響 23
3-4 垂直排列之盤狀液晶HDBP-8載子傳輸 24
3-4.1 垂直配向定溫之載子傳輸 24
3-4.2 垂直配向變溫之載子傳輸 25
3-4.3 元件厚度差異垂直配向載子傳輸 25
3-4.4 垂直配向各向同性態載子傳輸 26
3-4.5 垂直配向結晶態載子傳輸 26
3-4.6 HDBP-8傳輸特性論 .27
第四章 結論 37
參考文獻 38
參考文獻 References
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