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논문 기본 정보

자료유형
학위논문
저자정보

이수진 (고려대학교, Graduate School, Korea University)

지도교수
趙鎭漢, 林貞娥
발행연도
2015
저작권
고려대학교 논문은 저작권에 의해 보호받습니다.

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이 논문의 연구 히스토리 (2)

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I introduce a method of one-step printing of organic semiconductor channels and polymer dielectric bilayers for an organic field-effect transistor (OFET) device by controlling the organic semiconductor/dielectric polymer blend. The organic semiconductor molecules were vertically segregated on top of the polymer phase and crystallized at the center of the printed line pattern immediately after solvent evaporation without an additive process. I denote this self-organization as “centro-apical phase separation”. The thickness and width of the centro-apically segregated organic semiconductor crystalline stripe in the printed blend pattern were controlled by varying the relative content of the organic semiconductors. The influences of printing speed and blend solution concentration on the centro-apical phase separation were systematically investigated. Finally, the actual OFETs consisting of the centro-apically phase-separated organic semiconductor channel and a gate dielectric of the underlying polymer matrix exhibited good performance that approached previously reported values for devices prepared by the spin-casting or drop-casting methods

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CONTENTS
Abstract ?????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????? i
CONTENTS ????????????????????????????????????????????????????????????????????????????????????????????????????????????????? ii
LIST OF FIGURES ???????????????????????????????????????????????????????????????????????????????????????????????????? v
LIST OF TABLE ????????????????????????????????????????????????????????????????????????????????????????????????????????? x
1. Introduction ????????????????????????????????????????????????????????????????????????????????????????????????????????????? 1
2. Theoretical Background ???????????????????????????????????????????????????????????????????????????????????????? 6
2.1 Flory-Huggins interaction parameter ????????????????????????????????????????????????????????????????? 6
3. Experimental Background ?????????????????????????????????????????????????????????????????????????????????? 7
3.1. Picoliter fluidic dispenser ???????????????????????????????????????????????????????????????????????????????????? 7
4. Experimental procedures ???????????????????????????????????????????????????????????????????????????????????? 9
4.1. Materials and preparation ????????????????????????????????????????????????????????????????????????????????? 9
4.1.1. Materials ???????????????????????????????????????????????????????????????????????????????????????????????????????? 9
4.1.2. Device fabrication ???????????????????????????????????????????????????????????????????????????????????????? 11
4.2. Analysis ?????????????????????????????????????????????????????????????????????????????????????????????????????????? 11
4.2.1. Optical Microscopy (OM) Measurement?????????????????????????????????????????????????????? 11
4.2.2. Surface profiler (AlphaStep) Measurement ????????????????????????????????????????????????? 11
4.2.3. Scanning Electron Microscopy (SEM) Measurement ????????????????????????????????? 12
4.2.4. Time of Flight Secondary Ion Mass Spectroscopy (TOF-SIMS) Measurement ????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????? 12
4.2.5. X-ray photoelectron spectroscopy (XPS) Measurement ?????????????????????????????? 13
4.2.6. Two-dimensional grazing-incidence X-ray diffraction (2D-GIXD) Measurement ?????????????????????????????????????????????????????????????????????????????????????????????????????????? 13
4.3. Electrical performance????????????????????????????????????????????????????????????????????????????????????????? 13
5. Results and Discussion???????????????????????????????????????????????????????????????????????????????????????? 14
5.1. Characterization ?????????????????????????????????????????????????????????????????????????????????????????????? 14
5.1.1. Printing procedure ??????????????????????????????????????????????????????????????????????????????????? 14
5.1.2. Demonstration of vertical separation using SEM ???????????????????????????????????? 17
5.1.3. Demonstration of vertical separation using TOF-SIMS????????????????????????????? 20
5.1.4. Demonstration of vertical separation using XPS ????????????????????????????????????? 22
5.1.5. Analysis of 2D-WAX ????????????????????????????????????????????????????????????????????????????????? 24
5.2. Discussion about vertical central behavior?????????????????????????????????????????????????????? 27
5.2.1. Varying of the blend ratio ?????????????????????????????????????????????????????????????????????????? 27
5.2.2. Varying of the concentration?????????????????????????????????????????????????????????????????????? 30
5.2.3. Varying of the picoliter fluidic dispenser printing speed????????????????????????? 32
5.2.4. Evaporating mechanism??????????????????????????????????????????????????????????????????????????? 34
5.3. Electrical performance????????????????????????????????????????????????????????????????????????????????????? 46
6. Summary ???????????????????????????????????????????????????????????????????????????????????????????????????????????????? 54
References ??????????????????????????????????????????????????????????????????????????????????????????????????????????????????? 56

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