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배진혁(Jin-Hyeok Bae),김정엽(Jung-Yup Kim) 대한기계학회 2022 대한기계학회 춘추학술대회 Vol.2022 No.11
This paper presents how to apply hydrodynamic force on 1-DOF robot. Various hydrodynamic forces occur on robot link when it moves in fluid environment. To make efficient torque generation, each hydrodynamic forces need to be calculated. Experiment that set with single link and a motor will executed as constant velocity movement in both air and water environment. we will graph how much of torque is generated and compare with each environment. With this difference we can track hydrodynamic force that occurred by robot movement. and then we can apply this method to another experiment set with another robot link or fluid that has different property to find out its hydrodynamic forces.
배진혁(Jin-Hyeok Bae),김정엽(Jung-Yup Kim) 대한기계학회 2022 대한기계학회 춘추학술대회 Vol.2022 No.11
This paper presents how to apply hydrodynamic force on 1-DOF robot. Various hydrodynamic forces occur on robot link when it moves in fluid environment. To make efficient torque generation, each hydrodynamic forces need to be calculated. Experiment that set with single link and a motor will executed as constant velocity movement in both air and water environment. we will graph how much of torque is generated and compare with each environment. With this difference we can track hydrodynamic force that occurred by robot movement. and then we can apply this method to another experiment set with another robot link or fluid that has different property to find out its hydrodynamic forces.
박재훈,배진혁 한국응용과학기술학회 2014 한국응용과학기술학회지 Vol.31 No.3
Herein, we describe the effect of the cooling-off condition of a solution-processed 6,13-bis(triisopropylsilylethynyl)-pentacene (TIPS-pentacene) film on its molecular distribution and the resultant electrical properties. Since the solvent in a TIPS-pentacene droplet gradually evaporates from the rim to the center exhibiting a radial form of solute, for a quenched case, domains of the TIPS-pentacene film are aboriginally spread showing original features of radial shape due to suppressed molecular rearrangement during the momentary cooling period. For the slowly cooled case, however, TIPS-pentacene molecules are randomly rearranged during the long cooling period. As a result, in the lopsided electrodes structure proposed in this work, the charge transport generates more effectively under the case for radial distribution induced by the quenching technique. It was found that the molecular redistribution during the cooling-period plays an important role on the magnitude of the mobility in a solution-processed organic transistor. This work provides at least a scientific basis between the molecular distribution and electrical properties in solution-processed organic devices.
박재훈,배진혁 한국응용과학기술학회 2013 한국응용과학기술학회지 Vol.30 No.2
We analysed interfacial traps in organic thin-film transistors (TFTs) in which pentacene and 6,13-bis(triisopropylsilylethynyl)-pentacene (TIPS-pentacene) organic semiconductors were deposited by means of vacuum-thermal evaporation and drop-coating methods, respectively. The thermally-deposited pentacene film consists of dentritic grains with the average grain size of around 1 m, while plate-like crystals over a few hundred microns are observed in the solution-processed TIPS-pentacene film. From the transfer characteristics of both TFTs, lower subthreshold slope of 1.02 V/decade was obtained in the TIPS-pentacene TFT, compared to that (2.63 V/decade) of the pentacene transistor. The interfacial trap density values calculated from the subthreshold slope are about 3.4×1012/cm2 and 9.4×1012/cm2 for the TIPS-pentacene and pentacene TFTs, respectively. Herein, lower subthreshold slope and less interfacial traps in TIPS-pentacene TFTs are attributed to less domain boundaries in the solution-processed TIPS-pentacene film.
유창재,배진혁,금창민,이신두 한국물리학회 2010 Current Applied Physics Vol.10 No.1
We report on the optical anisotropy of a pentacene film on a rubbed (poly)vinylalcohol (PVA) layer related to the electrical performances of the pentacene organic field effect transistors (OFETs) depending on the direction of a current flow. The optical anisotropies of the PVA films are negligible with respect to whether or not rubbing process. In the pentacene OFET on the rubbed PVA layer, however, the optical anisotropy is observed and the anisotropy of the electrical performances directly corresponds to the optical anisotropy of the pentacene thin-film on the rubbed PVA layer.
권진혁,배진혁,이현주,박재훈 한국물리학회 2019 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.74 No.3
We demonstrate a dimethyl ketone treatment to produce a hydrophobic surface of cross-linked poly(4-vinylphenol) (c-PVP) insulators for pentacene thin-lm transistors (TFTs). Through water contact angle measurements, the dimethyl ketone treatment is proven to signicantly increase the surface hydrophobicity of c-PVP lms. The results of X-ray diffraction analyses indicate that the dimethyl ketone-treated c-PVP insulator contributes to enhancing the crystallinity of pentacene lms and reducing the density of lamellar grains and bulk phase crystallites in pentacene lms. In addition, the growth of lamellar grains is elucidated by examining the initial growths of the pentacene lms on the c-PVP lms with dierent surface energies. Consequently, the enhancement in the performance of pentacene TFTs is achieved by incorporating the dimethyl ketone-treated c-PVP lms as gate insulators.
Structural Modification of Organic Thin-Film Transistors for Photosensor Application
정현석,배진혁,이현주,Joel Ndikumana,박재훈 한국물리학회 2018 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.72 No.10
We investigated the light response characteristics of bottom-gate/top-contact organic TFTs fabricated using pentacene and polystyrene as an organic semiconductor and a polymeric insulator, respectively. The pentacene TFT with overlaps (50 μm) between the source and gate electrodes as well as between the drain and gate electrodes exhibited negligible hysteresis in its transfer characteristics upon reversal of the gate voltage sweep direction. When the TFTs were structurally modified to produce an underlap structure between the source and gate electrodes, clockwise hysteresis and a drain-current decrease were observed, which were further augmented by increasing the gate underlap (from 30 μm to 50 μm and 70 μm). Herein, these results are explained in terms of space charge formation and accumulation capacitance reduction. Importantly, we found that space charges formed under the source electrode contributed to the drain currents via light irradiation through the underlap region. Under constant bias conditions, the TFTs with gate underlap structures thus exhibited on-state drain current changes in response to light signals. In our study, an optimal photosensitivity exceeding 11 was achieved by the TFT with a 30 μm gate underlap. Consequently, we suggest that gate underlap structure modification is a viable means of implementing light responsiveness in organic TFTs.
금창민,배진혁,김원호,김민희,박재훈,이신두 한국물리학회 2011 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.58 No.52
We describe the effect of thermo-gradient-assisted solvent evaporation of an organic semiconductor, 6,13-bis(triisopropylsilylethynyl)-pentacene (TIPS-PEN), on the enhancement of the electrical properties of TIPS-PEN thin-film transistors (TFTs). The TIPS-PEN molecules are found to align themselves along the direction of the temperature gradient, from a high temperature region to a low temperature region, in the substrate. In contrast to typical solvent evaporation, thermo-gradientassisted solvent evaporation enhances the mobility and the current on-off ratio of the TIPS-PEN TFTs from 0.05 cm^2/Vs and 10^4 to 0.12 cm^2/Vs and 10^5, respectively. The thermo-gradient evaporation method should be useful in improving the electrical properties of the solution-processed TFTs.
황화납 양자점 기반 단파장 적외선 수광소자의 전기적 특성 향상을 위한 산화아연 나노입자 농도의 중요성
서경호,배진혁 한국센서학회 2022 센서학회지 Vol.31 No.2
We describe the importance of zinc oxide nanoparticle (ZnO NP) concentration in the enhancement of electrical properties in a lead sulfide quantum dot (PbS QD)-based shortwave infrared (SWIR) photodetector. ZnO NPs were synthesized using the sol–gel method. The concentration of the ZnO NPs was controlled as 20, 30 and 40 mg/mL in this study. Note that the ZnO NPs layer is commonly used as an electron transport layer in PbS QDs SWIR photodetectors. The photo-to-dark ratio, which is an important parameter of a photodetector, was intensively examined to evaluate the electrical performance. The 20 mg/mL condition of ZnO NPs exhibited the highest photo-to-dark ratio value of 5 at .1 V, compared with 1.8 and 0.4 for 30 mg/mL and 40 mg/mL, respectively. This resulted because the electron mobility decreased when the concentration of ZnO NPs was higher than the optimized value. Based on our results, the concentration of ZnO NPs was observed to play an important role in the electrical performance of the PbS QDs SWIR photodetector.