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바인더 함량에 따른 염료감응 태양전지의 효율에 관한 연구
기현철,정행윤,구할본,Ki, Hyun-Chul,Jung, Haeng-Yun,Gu, Hal-Bon 한국전기전자재료학회 2013 전기전자재료학회논문지 Vol.26 No.12
In this study, we have fabricated the dye sensitized solar cell (DSSC) composed by a transparent conductive oxide (TCO), a nanocrystalline semiconductor film usually $TiO_2$, a sensitizer adsorbed on the surface of the semiconductor, an electrolyte containing a redox mediator and a counter electrode. The $TiO_2$ nanopowder was prepared by sol-gel methode. The HCl (hydrochloric acid) and TBAOH (Tetrabutyl amonium hydroxide) was added for improving the catalyst and distributed properties of $TiO_2$ nanopowder. Ammonium hydroixde was added in order to control the morphology and size of $TiO_2$ nano crystal. A $TiO_2$ paste for working electrode was prepared with the addition of HPC (hydroxypropyl cellulos) used as a binder of which volume was controled as 1.3, 1.5, 1.7, and 2.0%. The measured I-V curves of assembled DSSC showed that the cell with 1.7% HPC binder had the best efficiency of 6.79%.
전도성 기판의 플라즈마 처리에 따른 염료감응형 태양전지 광전변환 효율 특성 변화
기현철,김선훈,김두근,김태언,홍경진,소순열,Ki, Hyun-Chul,Kim, Seon-Hoon,Kim, Doo-Gun,Kim, Tae-Un,Hong, Kyung-Jin,So, Soon-Yeol 한국전기전자재료학회 2012 전기전자재료학회논문지 Vol.25 No.11
This study is explore the photoelectric conversion change of dye-sensitized solar cells with surface treatment of the conductive substrate. gases of FTO surface treatment were $N_2$, and $O_2$. Treatment conditions of surface were gas flux from 25 sccm to 50 sccm and RF power were from 25 W to 50 W. Treatment time and pressure were fixed 5 min and 100 mtoor. The best sheet resistance and surface roughness were obtained by $O_2$ 50 sccm and 50 W and that result were 7.643 ${\Omega}/cm^2$ and 17.113 nm, respectively. The best efficiency result was obtained by $O_2$ 50 sccm and 50 W and that result of Voc, Jsc, FF and efficiency were 7.03 V, 14.88 $mA/cm^2$, 63.75% and 6.67%, respectively.
1.3μm 분포 괴환형 레이저 다이오드의 무반사 설계 및 특성
기현철,김선훈,홍경진,김회종,Ki, Hyun-Chul,Kim, Seon-Hoon,Hong, Kyung-Jin,Kim, Hwe-Jong 한국전기전자재료학회 2009 전기전자재료학회논문지 Vol.22 No.3
We have investigated the effect of the quality of 1.3 um distributed feed back laser diode (DFB-LD) on the design of anti-reflection (AR) coatings. Optimal condition of AR coating to prevent internal feedback from both facets and reduce the reflection-induced intensity noise of laser diode was simulated with Macleod Simulator. Coating materials used in this work were ${Ti_3}{O_5}$ and $SiO_2$, of which design thickness were 105 nm and 165 nm, respectively. AR coating films were deposited by Ion-Assisted Deposition system. The electrical and optical properties of 1.3 um laser diode were characterized by Bar tester and Chip tester. Threshold current and slop-efficiency of DFB-LD were 27.56 mA 0.302 W/A. Far field pattern and wavelength of DFB-LD were $22.3^{\circ}(Horizontal){\times}24.4^{\circ}$ (Vertical), 1313.8 nm, respectively.
기현철,홍경진,Ki, Hyun-Chul,Hong, Kyung-Jin 한국전기전자재료학회 2016 전기전자재료학회논문지 Vol.29 No.12
DSSC (dye-sensitized solar cell) is expected to be one of the next-generation photovoltaics because of its environment-friendly and low-cost properties. However, commercialization of DSSC is difficult because of the electrolyte leakage. We propose thermal curable base on silicon resin and apply a unit cell and large area ($200{\times}200mm$) dye-sensitized solar cell. The resin aimed at sealing of DSSC and gives a promising resolution for sealing of practical DSSC. In result, the photoelectric conversion efficiency of the unit cell and the module was 6.63% and 5.49%, respectively. In the durability test result, the photoelectric conversion efficiency of the module during 500, 1,000, 1,500 and 2,000 hours was 0.73%, 0.73%, 1.82% and 2.36% respectively. It was confirmed that the photoelectric conversion efficiency characteristics are constant. We have developed encapsulation material of thermal curing method excellent in chemical resistance. A sealing material was applied to the dye-sensitized solar cell and it solved the problem of durability the dye-sensitized solar cell. Sealing material may be applied to verify the possibility of practical application of the dye-sensitized solar cell.
ITO 투과율 향상을 위한 Buffer층 설계에 관한 연구
기현철,이정빈,김상기,홍경진,Ki, Hyun-Chul,Lee, Jeong-Bin,Kim, Sang-Ki,Hong, Kyung-Jin 한국전기전자재료학회 2010 전기전자재료학회논문지 Vol.23 No.1
We have proposed an Buffer layer to improve the transmittance of ITO. Here, $SiO_2$ and $TiO_2$ were selected as the Buffer layer coating material. The structures of Buffer layer were designed in ITO/$SiO_2/TiO_2$/Glass and ITO/Glass/$TiO_2/SiO_2$. Then, these materials were deposited by ion-assisted deposition system. Transmittances of deposited ITO were 86.14 and 85.07%, respectively. These results show that the proposed structure has higher transmittance than the conventional ITO device.
유기 발광소자의 효율 향상을 위한 광학박막 및 마이크로렌즈 설계
기현철,김두근,김선훈,김상기,박아름,구할본,Ki, Hyun-Chul,Kim, Doo-Gun,Kim, Seon-Hoon,Kim, Sang-Gi,Park, A-Reum,Gu, Hal-Bon 한국전기전자재료학회 2011 전기전자재료학회논문지 Vol.24 No.10
We have proposed an optical thin film and micro lens to improve the luminance of organic light emitting device. The first method, optical thin film was calculated refractive index of dielectric layer material that was modulated refractive index of organic material, ITO (indium tin oxide)and glass. The second method, microlens was applied with lenses on the organic device. Optical thin films were designed with Macleod Simulator and Micro Lenses were calculated by FDTD (finite-difference time-domain) solution. The structure of thin film was designed in organic material/ITO/dielectric layer/glass. The lenses size, height and distance were 5 ${\mu}m$, 1 ${\mu}m$, 1 ${\mu}m$, respectively. The material of micro lenses used silicon dioxide. Result, The highest luminance of OLED which applied with microlens was 11,185 $cd/m^2$, when approval voltage was 14.5 V, applied thin film was 5,857 $cd/m^2$. The device efficiency applying microlens increased 3 times than the device which does not apply microlens.
염기성 촉매제를 이용한 염료감응 태양전지의 효율에 관한 연구
기현철,정행윤,구할본,Ki, Hyun-Chul,Jung, Haeng-Yun,Gu, Hal-Bon 한국전기전자재료학회 2013 전기전자재료학회논문지 Vol.26 No.10
In this study, the influence of electrochemical properties by mixing Tetrabutylammonium hydroxide (TBAOH) and ammonium hydroxide (NH4OH) electrode on the dssc. The titanias were prepared using a sol-gel method by mixing Tetrabutylammonium hydroxide and Ammonium hydroxide. The $TiO_2$ nanopowder prepared by sol-gel methode, and to improve the distributed properties of $TiO_2$ nanopowder, the TBAOH and NH4OH was added. The I-V values of cells show that the Tetrabutylammonium has 6.51% efficiency.
유전체 방전 살균 극대화를 위한 금속 나노 구조를 이용한 표면 플라즈몬 전극에 관한 연구
기현철,오병윤,Ki, Hyun-Chul,Oh, Byeong-Yun 한국전기전자재료학회 2018 전기전자재료학회논문지 Vol.31 No.2
In this study, we investigated plasmon effects to maximize the sterilization of dielectric discharge. We predicted the effect using the finite difference time domain (FDTD) method as a function of electrode shape, size, and period. The structure of the electrode was designed with a thickness of 100 nm of silver nanoparticles on a glass substrate, and was varied according to the shape, size, and period of the electrode hole. Based on the results, it was confirmed that the effect of plasmons was independent of the shape of the electrode hole. It was thus confirmed that the plasmon effect depended only on the size and period of the holes. Further, the plasmon effect was affected by the size rather than period of the holes. Because the absorption of light by the metal varied according to the size of the hole, the plasmon effect generated by the absorption of light also varied. The best results were obtained when the radius and period of the electrode holes were $0.1{\mu}m$ and $0.4{\mu}m$, respectively.
기현철,신현오,황은혜,권태혁,Ki, Hyun-Chul,Shin, Hyeon Oh,Hwang, Eun Hye,Kwon, Tae-Hyuk 한국전기전자재료학회 2017 전기전자재료학회논문지 Vol.30 No.2
We were designed the hole transport layer of the new composite skeleton structure having a high charge mobility and thermal stability. In this paper, a hole transport layer material based on thiophene molecular structure capable of hole mobility characteristics and high triplet energy was designed and synthesized. The structures and properties of the synthesized compounds were characterized by NMR, fluorescence spectroscopy and energy band gap. As a result of NMR measurement, it was confirmed that when analyzing the integrated type with the position where the measured peak is displayed, it agrees with the structure of hole transport materials. The emission characteristics of the hole transport layer material showed absorption characteristics at 412 nm and 426 nm, respectively, and exhibited emission characteristics in the range of 469 nm and 516 nm.
다층 박막을 이용한 패럴 단면의 무반사 코팅 설계 및 특성
기현철,양명학,김선훈,김태언,김회종,구할본,Ki, Hyun-Chul,Yang, Mung-Hark,Kim, Seon-Hoon,Kim, Tea-Un,Kim, Hwe-Jong,Gu, Hal-Bon 한국전기전자재료학회 2007 전기전자재료학회논문지 Vol.20 No.11
In this paper, we have designed the anti-reflection(AR) coating for $1400{\sim}1600$ nm wavelength range on the ferrule facet of optical connector. The low-temperature ion-assisted deposition was applied to AR coating on the ferrule facet in order to avoid damage of optical connector. We have measured the refractive index of coating film($Ta_2O_5\;and\;SiO_2$) using the ellipsometer and optimized the film thickness using the SEM and thickness measurement equipment. UV-VIS-NIR spectrophotometer is used to measure transmissivity of the AR coated ferrule facet. The refractive index of $Ta_2O_5\;and\;SiO_2$ is $2.123{\sim}2.125$ and $1.44{\sim}1.442$, respectively, for $1400{\sim}1600$ nm wavelength range. The transmissivity of the AR coated ferule facet is more than 99.8 % for $1425{\sim}1575$ nm wavelength range and more than 99.5 % for $1400{\sim}1600$ nm wavelength range. The return loss of the AR coated ferrule facet is 30.1 dB.