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최기범,이성민,황재열,윤대호,이규형,김종영 대한화학회 2018 Bulletin of the Korean Chemical Society Vol.39 No.4
In this work, we investigated the dielectric property of layer‐structured Al2O3/few‐layer graphene (FLG) composite by high temperature impedance spectroscopic analysis. The sintered composites have highly enhanced permittivity (ε = 17.3) compared to pure platy alumina (ε = 7.3) with low dielectric loss (tanδ ~ 10−3). Percolative permittivity of the composites exhibits almost frequency‐independent behavior at 1 Hz to 1 MHz even though the real permittivity was increased, compared to that of pure platy alumina. Such behavior can be explained by intervening dielectric interface between alumina and FLG based on multilayer filler model. After percolation threshold (FLG > 0.75 vol %), the permittivity is further enhanced up to ~260 (@1 kHz), which amounts to >35 fold increase, compared to pure platy alumina because of interfacial capacitance between FLG platelets and alumina. According to temperature‐dependent impedance analysis, a dielectric relaxation due to Al2O3/FLG interface is observed in the frequency range of 1 Hz to 1 kHz at high temperature (RT = 400°C) besides that due to Al2O3 grains (>10 MHz). Real permittivity increases up to >20 000 at 400°C at low frequency, whereas dielectric loss remains as tanδ ~ 3 × 10−4. High temperature impedance analysis shows that the effect of interface between Al2O3 and FLG is responsible for such dielectric relaxation at high temperature.
펜타센 TFT와 유기 LED로 구성된 픽셀 어레이 제작
최기범,류기성,정현,송정근,Choe Ki Beom,Ryu Gi Seong,Jung Hyun,Song Chung Kun 대한전자공학회 2005 電子工學會論文誌-SD (Semiconductor and devices) Vol.42 No.12
본 논문에서는 Poly-ethylene-terephthalate (PET) 기판 위에 Organic Thin Film Transistor (OTFT)와 Organic Light Emitting Diode (OLED)를 직렬 연결시킨 픽셀과 64 x 64 픽셀로 구성된 어레이를 제작하여 동작을 시연하였다. OTFT는 PET 기판과의 호환성을 고려하여 Poly 4-vinylphenol을 게이트 절연체로, 펜타센을 활성층으로 사용하여 제작되었다. 개별 소자 수준에서는 이동도가 $1.0\;cm^2/V{\cdot}sec$로 나타났으나, 어레이에서는 $0.1\~0.2\;cm^2/V{\cdot}sec$로 약 10배 정도 감소하였다. 어레이의 동작을 분석하였고 OTFT의 OLED에 대한 전류구동능력을 확인하였다. In this paper, we fabricated a pixel array in which each pixel was consisted of Organic Thin Film Transistor (OTFT) serially connected with Organic Light Emitting Diode (OLED) on Poly-ethylene-terephthalate (PET) substrate and the number of pixels was 64 x 64. As a gate insulator of OTFT, the thermally cross-linked PVP was used and the organic semiconductor, Pentacene, is deposited for an active layer of OTFT considering the compatibility with PET substrate. The mobility of OTFT is $1.0\;cm^2/V{\cdot}sec$ as a discrete device, but it was reduced to $0.1\~0.2\;cm^2/V{\codt}sec$ in the array. We analyzed the operation of the array and confirmed the current driving ability of OTFTs for the OLEDs.