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Electron-Beam-Assisted Low-Temperature Crystallization of CuInSe2
김맹준,이성엽,이형락,손상호 한국물리학회 2019 New Physics: Sae Mulli Vol.69 No.5
The effects of electron-beam (E-beam) irradiation on the formation of CuInSe2 (CIS) thin films were investigated through a structural characterization of amorphous CIS (a-CIS) thin-films coevaporated onto glass substrates. A-CIS thin-films were either heat-treated or subjected to E-beam irradiation. With the E-beam treatment, the crystallization temperature significantly decreased. This is probably due to the catalytic effect of the electrons reducing the activation energy and promoting the nucleation and growth of crystallite grains. The results imply that crystallization can be promoted by using an electron-mediated catalytic effect. The findings in this study open the way for low-temperature crystallization of CIS thin films.
Study of the physical property of the cadmium sulfide thin film depending on the process condition
김맹준,Bong-Ki Min,이성호,김홍탁,Chang-Duk Kim,Sang Kooun Jung,손상호 한국물리학회 2010 Current Applied Physics Vol.10 No.3
CdS thin films of an n-type window layer of the CdTe thin film solar cell were grown by a chemical bath deposition method. The physical properties of the CdS thin films were investigated depending on the various substrates and the stirring speed. Surface morphological study was carried out by the scanning electron microscope and atomic force microscope. The structural property was investigated by using the Xray diffraction measurement and transmission electron microscopy. The structural characteristic of the CdS films depend on the substrate crystal structure. The stirring speed effect to the kinetics of the CdS film growth proved the heterogeneous growth mechanism proposed by Ortega-Borges and Lincot.
A Quasi-gaseous CdCl2 Treatment of a CdTe/CdS Heterojunction
김맹준,이성호,손상호 한국물리학회 2010 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.57 No.61
In order to improve the efficiency of a solar cell device, we performed a CdCl2 treatment on a CdTe/CdS heterojunction grown with a sputtering method. The treatment not only used the conventional solution method where the specimen is dipped in CdCl2-methanol solution directly but also used a quasi-gaseous method where the specimen is exposed to the CdCl2 gas vaporized from a quartz vessel containing the CdCl2 -methanol solution. The structural, optical and morphological properties were investigated by the help of the X-Ray diffraction, transmission electron microscopy, scanning electron microscopy and UV-Vis-Nir measurements in order to verify the effectiveness of the quasi-gaseous CdCl2 treatment. When all processes were performed under the same conditions except for the CdCl2 treatment, the quasi-gaseous CdCl2 treatment provided results superior to the aforementioned conventional CdCl2 solution treatment in relation to the physical properties of the CdTe/CdS heterojunction.
저온 주사 레이저 현미경 (LTSLM)을 이용한 YBCO 박막의 임계 온도 분포 분석
박상국,김맹준,이형철 한국물리학회 2009 새물리 Vol.58 No.2
Low-temperature scanning laser microscopy (LTSLM) can be used for a two-dimensional display of various sample responses arising from localized excitation. As shown in many experiments, LTSLM creates interesting results when applied to superconductors. Thus, we have investigated the distribution of the critical temperature in 130-μm-wide and 570-μm-long YBa2Cu3O7-δ films by using LTSLM. For improving the signal-to-noise ratio, we modified the laser-beam configuration by adopting a maximum 3-kHz modulated laser beam produced by using a mechanical opto chopper as needed. We have observed a spatial nonuniformity of the ac voltage response, δV(x), which is proportional to ∂ρ(x, JB)/∂T in the transition temperature region, and we have displayed the data in a two-dimensional image. 저온 주사 레이저 현미경 (Low temperature scanning laser microscopy, LTSLM)은 국소적 자극에 의해 일어난 시료의 다양한 반응을 2차원으로 형상화하는데 사용될 수 있다. 많은 실험들에서 볼 수 있듯이, LTSLM은 특히 초전도체에 적용되었을 때 흥미로운 결과를 나타낸다. 그래서 우리는 LTSLM을 이용해서 폭 130μm, 길이 570μm의 YBa2Cu3O7-δ 박막의 임계온도의 분포를 분석하였다. 신호 대 노이즈 비를 개선하기 위하여, 기계적 Chopper를 사용해서 최대 주파수 3 kHz로 조정하여 집광된 레이저 빔을 시료에 주사하였다. 우리는 전이온도 영역에서 ∂ρ(x, JB)/∂T에 비례하는 교류전압신호 (δV (x))의 불균일성을 관찰하였고 그 결과들을 2차원의 그림으로 나타내었다.
필라멘트 구조로 분리된 YBCO 박막에서 필라멘트 넓이와 간격이 교류손실에 미치는 영향
나동현,박현욱,김맹준,장용식,김지만,이형철,이용호,Na D. H,Park H. W,Kim M. J,Chang Y. S,Kim J. M,Ri H. C,Lee Y. H 한국초전도학회 2004 Progress in superconductivity Vol.6 No.1
To investigate the influence of strip width and inter-strip separation on the ac loss, arrays of parallel strips with different widths and separations were prepared. Studies on the hysteresis-loss characteristics of multifilamentary YBCO films were performed. The local magnetic field due to magnetization currents is measured by a scanning Hall probe microscope. Based on these results a conceptual design for a low loss YBCO coated conductor is suggested.
Water-soluble Core/Shell Nanoparticles for Proton Therapy through Particle-induced Radiation
박정찬,정명환,김맹준,김계령 한국물리학회 2015 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.66 No.3
Metallic nanoparticles have been used in biomedical applications such as magnetic resonanceimaging (MRI), therapy, and drug delivery systems. Metallic nanoparticles as therapeutic toolshave been demonstrated using radio-frequency magnetic fields or near-infrared light. Recently, therapeuticapplications of metallic nanomaterials combined with proton beams have been reported. Particle-induced radiation from metallic nanoparticles, which can enhance the therapeutic effectsof proton therapy, was released when the nanoparticles were bombarded by a high-energy protonbeam. Core/shell nanoparticles, especially Au-coated magnetic nanoparticles, have drawn attentionin biological applications due to their attractive characteristics. However, studies on the phasetransfer of organic-ligand-based core/shell nanoparticles into water are limited. Herein, we demonstratedthat hydrophobic core/shell structured nanomaterials could be successfully dispersed inwater through chloroform/surfactant mixtures. The effects of the core/shell nanomaterials and theproton irradiation on Escherichia coli (E. coli) were also explored.