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접촉 전극의 엣지에 형성된 스캘럽핑이 박막 트랜지스터의 전기적 성능에 미치는 영향에 대한 연구
정재욱(Jaewook Jeong),홍용택(Yongtaek Hong) 대한전자공학회 2007 대한전자공학회 학술대회 Vol.2007 No.11
We report effect of edge scalloping of the contact electrodes of thin-film transistors (TFTs) on their electrical performance. The scalloped edges are modeled as a sinusoidal wave. We emulate the source/drain current and current density distribution for scalloped edge TFT by using ATLAS 3D simulator. Peak-to-peak values, period, and phase shift between S/D electrodes were varied. Our simulation result showed that the current density is localized at the peak point of source/drain scalloped edge according to the varying parameters. The current density localization is sensitive to the parameters in order of the peak-to-peak value, period, and phase shift. TFT electrical performance change is also analyzed for different channel lengths.
잉크젯 방식으로 형성된 은 잉크 패턴의 소수성 격벽을 이용한 분리
김민수(Minsoo Kim),정재욱(Jaewook Jeong),홍용택(Yongtaek Hong),강희석(Heuiseok Kang),이상호(Sang-Ho Lee) 대한전기학회 2010 대한전기학회 학술대회 논문집 Vol.2010 No.7
We propose a method to form electrodes spaced by a few micron via using a conventional drop-on-demand (DOD) printer. A micromolding in capillary (MIMIC) is performed to create the "hydrophobic barrier" on the substrate. The pre-patterned barrier makes the printed silver (Ag) ink pattern divided into separated electrodes by its non-wettability against the Ag ink. In this way, we have successfully fabricated silver electrodes with well-defined 5 ㎛ gap.
정승준(Seungjun Chung),이재현(Jae-Hyun Lee),김장주(Jang-Joo Kim),홍용택(Yongtaek Hong) 대한전자공학회 2007 대한전자공학회 학술대회 Vol.2007 No.11
We report properties and bias-temperature-stress (BTS) stability of the planarized stainless steel (SS) foil substrates and their application to top-emission organic light-emitting diodes (TEOLEDs). We used benzocyclobutene (BCB) for planarization material. After applying BCB layer on the SS foil substrate, we successfully reduced the surface roughness from 60±20(RMS)㎚ to 1.2±0.4(RMS)㎚, which was measured by an atomic force microscope (AFM) method. The BCB layer showed a good BTS stability when we performed the BTS test by applying 80V across the BCB layer at 80℃. Capacitance and leakage current for the BCB layer was changed to 1.11㎋/㎠ and 207.2㎩/㎠ from its original values of 1.03㎋/㎠ and 64.5㎩/㎠, respectively, after 3hours BTS test We fabricated TEOLED on the BCB-planarized SS foil substrate am compared its performance with the TEOLED fabricated on a silicon substrate. Although the surface roughness of the planarized BCB SS foil substrate was higher than that of the silicon substrate (0.145±0.324㎚, RMS), we obtained similar performance of 2000㏅/㎡ luminance at 0.3㎃/㎠ (6.5V) and operation stability of 130 hours of half-luminance lifetime, from both devices
주파수에 따른 임피던스 변화를 이용한 OLED 소자의 열화 분석
김현종(Hyunjong Kim),예석민(Seok Min Ye),노승욱(Seunguk Noh),이창희(Changhee Lee),홍용택(Yongtaek Hong) 대한전자공학회 2007 대한전자공학회 학술대회 Vol.2007 No.11
We report an electrical equivalent circuit modeling for fresh and aged organic light emitting diode (OLED) by using impedance spectroscopy. A standard Alq₃-based OLED of ITO/mMTDATA/α-NPB/Alq3/LiF/Al on glass substrate was used. Equivalent reactance and resistance measured at different frequencies was used to model organic bulk layer and interface as a combination of capacitors and resistors. Cole-Cole plot of the measured impedance showed that the frequencies where maximum magnitude of reactance and where reactance changes from negative to positive have been lowered after the OLED was aged. These frequency shifts can be explained by an equivalent time constant for each organic layer and organic/organic interface; thus, can be used to study OLED degradation mechanisms.