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Lim, Donggun,Park, Jeong Eun,Lee, Sang Hyeop,Song, Chan Moon,Song, Woochang American Scientific Publishers 2017 Journal of Nanoscience and Nanotechnology Vol.17 No.5
<P>In this study, the optimal conditions of ZnS thin film were determined by adjusting the amount of sodium citrate added to the ZnS thin film. The heat treatment of ZnS thin film was conducted using Rapid Thermal Processing (RTP). The morphology of the grown ZnS thin film was examined using Field Emission Scanning Electron Microscopy (FE-SEM). The measurement was carried out using Ultraviolet-Visible (UV/VIS) Spectroscopy and the light penetration was measured at 300 similar to 800 nm using a tungsten lamp. When the concentration of the sodium citrate was 0.4 M and greater, the cracking phenomenon of the ZnS thin film was reduced and a high quality thin film was produced.</P>
광수집 효율 극대화를 통한 결정질 실리콘 태양전지 효율 향상
임동건,박주억,김준희,조해성 韓國交通大學校 2013 한국교통대학교 논문집 Vol.48 No.-
Surface texturing of the silicon wafer is one of the most important ways for high efficiency solar cell. The texturing process reduces the surface reflection loss through photon trapping, so that short circuit current of the solar cell increases. In our report a relatively simple process for fast two-step texturing of p-type(100) CZ- silicon surface using metal-assisted chemical etching in aqueous hydrofluoric acid (HF) and hydrogen peroxide solution(H2O2) at room temperature. The wafers were first degreased by HCl(10%) for 3 min, followed by immersion in HF(10%) for 3 min. Then the wafers were first textured by KOH solution at 80℃ for 30 min. For the second texturing a thin layer of silver with a nominal thickness of 5nm was deposited on the surface by evaporation system. After this process the samples were etched in HF : H2O2 : H2O = 1:5:10 at room temperature for 80s - 240s. Due to the local catalytic of the Ag clusters, this treatment results in the nano-scale texturing on the surface. The average reflectance was less than 2.3% with two-step texturing. Cell results obtained in this study were up to 15.83% efficient for the best two-step metal-assisted chemical textured crystalline silicon solar cell.
임민택(Min-Taek Lim),안동근(Donggun An),성소연(So-Yeon Sung),성은현(Eun-Hyun Sung) 한국영재교육학회 2018 영재와 영재교육 Vol.17 No.3
본 연구에서는 수업요소와 창의성교육 요소를 통합적으로 고려한 유아교사의 창의성교육 평가척도를 개발하고 그 타당도를 검증하였다. 이를 위해 현장 유아교사 289명을 대상으로 개방형 설문지를 이용하여 창의적인 수업에 대한 암묵적 인식을 조사하고, 문헌고찰을 바탕으로 유아기 발달특성을 고려한 창의성의 교육요소를 도출하였다. 이와 같은 요소 들이 반영되어 제작된 유아교사의 창의성교육 평가척도는 유아교사 219명을 대상으로 예비조사가 실시되었으며, 탐색적 요인분석 결과 심리적지지, 사고력확장, 자기주도, 교수학습방법, 동기유발의 5개의 요인이 추출되었다. 본 조사에서는 유아교사 410명을 대상으로 평가도구의 타당성을 검증하였다. 확인적 요인분석을 통해 구성타탕도가 입증되었고, 유아의 창의성 증진을 위한 역할, 창의적 자기효능감, 일상적 창의성과의 상관분석을 통해 본 척도의 준거관련 타당도가 확인되었다. 본 연구의 이론적, 방법론적, 실제적 함의와 향후 연구의 방향성을 논의하였다. This study developed an assessment scale of creativity education for early childhood teachers and tested the validity of the scale. For this, we examined the implicit perceptions about creative classes for 289 early childhood teachers using the open-ended questionnaire, and drew the factors of creative education through the literature review. The assessment scale of creative education that was developed based on the factors was tested by 219 early childhood teachers. From the results of the exploratory factor analysis, 5 factors were extracted. The assessment scale was administered to 410 early childhood teachers in order to test its validity. From the results of the confirmatory factor analysis, its construct validity was confirmed. Its criterion validity was also confirmed from the results of correlation analysis between the assessment scale of creative education and other scales measuring teachers’ roles for improving young children’s creativity, teachers’ creative self-efficacy, and teachers’ everyday creativity. Theoretical, methodological, and practical implications for the findings and future directions were discussed.
저가 고효율 결정질 실리콘 태양전지 제작을 위한 전극 형성 기술 개발
양계준,임동건,조해성,김준희,박주억 韓國交通大學校 2013 한국교통대학교 논문집 Vol.48 No.-
The screen printed technique is one of the electrode forming technologies for crystalline silicon solar cell. It has the advantage that can raise the production efficiency due to simple and low cost process. The electrode technology is the core process because the electrode feature is given the biggest influence. In this paper, we tried to change conditions such as squeegee angle, snap off, printing pressure and mesh spacing. As a result, the screen printing process showed better conversion efficiency with higher finger height. We achieved the energy conversion efficiencies of 17.3 % mono-crystalline silicon solar cell with optimal screen printing conditions.