Design and Synthesis of Heterocyclic Discotic Liquid Crystal Materials and Their Application for N-Type Organic Field-Effect Transistors
Date Issued
2007
Date
2007
Author(s)
Chu, Chieh
DOI
en-US
Abstract
我們成功合成出以quinoxaline為主體架構，並帶有含氟取代及不含氟取代長碳鏈之液晶材料。利用熱重量分析儀和循環伏特安培儀來確認其熱穩定性和還原電位，並以偏光顯微鏡、熱差式掃描卡計儀、及變溫粉末X光繞射儀來鑑定其中間相。這些具液晶相的分子成膜在矽基板上或是以自組裝薄膜修飾後的矽基板上時，其排列方向及表面型態，分別藉由粉末X光繞射儀和原子力顯微鏡來研究。我們成功利用親氟及斥氟的作用力來使分子能夠以垂直排列的方式在PFTS修飾的矽基板表面上，這提供了一個新的準則來設計能應用在有機場效電晶體的有機半導體材料。
Three series of quinoxaline-based liquid crystal materials with or without semifluorinated alkyl chains have been successfully synthesized. Their thermal stabilities, reduction potentials, and mesophase characteristics have been examined by TGA, CV, POM, DSC, and temperature-dependent PXRD, respectively. The molecular orientation and their film morphology on the substrate (SiO2/Si) with or without SAMs also have investigated by PXRD and AFM. The control of molecular orientation, to be perpendicular to the substrate treated with PFTS via fluorophilic/fluorophobic interaction, has been achieved. This method provides a new molecular design principle enabling desired molecular alignment of organic semiconducting materials for organic field-effect transistors.
Subjects
負電型
有機場效電晶體
盤狀液晶
N-Type
OFETs
Discotic Liquid Crystals
Type
thesis
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