Fabrication and characterization of organic thin film transistor using carbon nanotube/polymer nanocomposites탄소나노튜브/고분자 나노복합재료를 이용한 유기 박막 트랜지스터 제조 및 특성 평가

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Organic TFTs as a replacement for amorphous silicon based TFTS receives lots of attention due to strong advantages such as large area coverage, low temperature processing, structural flexibility and low-cost processing for next generation electronics, while they also suffer from poor device mobility. The high field-effect mobility and solution processability of regioregular poly(3-hexylthiophene) (P3HT), a member of the most studied family of conducting polymers, have considered as interesting material in organic thin-film transistors due to their self-organized conjugated lamellae with strong л- л stacking. However, $P3HT (10^{-3}cm^2V^{-1}s^{-1})$ indicate lower charge mobility generally than inorganic semiconductor $(Si:500cm^2V^{-1}s^{-1 )$. To enhance the charge mobility of P3HT, carbon nanotubes (CNTs) have been incorporated into P3HT recently by many researcher. Since carbon nanotubes were reported by Iijima in 1991, the unique structure and chemical, mechanical, optical, and conducting properties of CNTs has made them promising materials for various applications such as electrodes in circuits, hole/electron transport media in photovoltaic devices, mobility enhancers for organic semiconductors, etc. However, it is extremely difficult to disperse in a polymer matrix because of their strong Van der Waals interactions between the each tubes. In this study, Solution processable Organic Thin-Film Transistors(OTFTs) with CNT were fabricated to overcome those above problems. First of all, The chosen method was non-covalent functionalization process to minimize the drop of electric conductivity in CNT based materials. A functionalization process was investigated to homogeneously disperse single wall carbon nanotubes(SWNTs) by modified pyerene molecules. This modification expects that SWNTs can be dispersed in hydrophobic solvents by increasing the hydrophobicity, steric hinderance effect. SWNTs after non-covalent functionalization by modified molecules show that...
Advisors
Jeon, Seok-Wooresearcher전석우researcher
Description
한국과학기술원 : 신소재공학과,
Publisher
한국과학기술원
Issue Date
2011
Identifier
467745/325007  / 020093199
Language
eng
Description

학위논문(석사) - 한국과학기술원 : 신소재공학과, 2011.2, [ vii, 67 p. ]

Keywords

Conductive polymer; Organic thin-film transistor; Non-covalent functionalization; Carbon nanotube; Nanocomposites; 나노복합체; 전도성 고분자; 유기 박막 트랜지스터; 비공유 기능기화; 탄소나노튜브

URI
http://hdl.handle.net/10203/51871
Link
http://library.kaist.ac.kr/search/detail/view.do?bibCtrlNo=467745&flag=dissertation
Appears in Collection
MS-Theses_Master(석사논문)
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