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박형 결정질 실리콘 태양전지에서의 휨현상 감소를 위한 알루미늄층 두께 조절
백태현,홍지화,임기조,강기환,강민구,송희은,Baek, Tae-Hyeon,Hong, Ji-Hwa,Lim, Kee-Joe,Kang, Gi-Hwan,Kang, Min-Gu,Song, Hee-Eun 한국태양에너지학회 2012 한국태양에너지학회 논문집 Vol.32 No.suppl3
Crystalline silicon solar cell remains the major player in the photovoltaic marketplace with 80% of the market, despite the development of various thin film technologies. Silicon's excellent efficiency, stability, material abundance and low toxicity have helped to maintain its position of dominance. However, the cost of silicon materials remains a major barrier to reducing the cost of silicon photovoltaics. Using the crystalline silicon wafer with thinner thickness is the promising way for cost and material reduction in the solar cell production. However, the thinner the silicon wafer is, the worse bow phenomenon is induced. The bow phenomenon is observed when two or more layers of materials with different temperature expansion coefficiencies are in contact, in this case silicon and aluminum. In this paper, the solar cells were fabricated with different thicknesses of Al layer in order to reduce the bow phenomenon. With less amount of paste applications, we observed that the bow could be reduced by up to 40% of the largest value with 120 micron thickness of the wafer even though the conversion efficiency decrease by 0.5% occurred. Since the bowed wafers lead to unacceptable yield losses during the module construction, the reduction of bow is indispensable on thin crystalline silicon solar cell. In this work, we have studied on the counterbalance between the bow and conversion efficiency and also suggest the formation of enough back surface field (BSF) with thinner Al layer application.
광탄성 프린지 위상 이동법을 이용한 곡선보평판의 응력 해석
백태현,김명수,김수일,Baek, Tae-Hyeon,Kim, Myeong-Su,Kim, Su-Il 대한기계학회 2000 大韓機械學會論文集A Vol.24 No.9
The method of photoelasticity allows one to obtain principal stress differences and principal stress directions in a photoelastic model. In the classical approach, the photoelastic parameters are measured manually point by point. This is time consuming and requires skill in the identification and measurement of photoelastic data. Fringe phase shifting method has been recently developed and widely used to measure and analyze fringe data in photo-mechanics. This paper presents the test results of photoelastic fringe phase shifting method for the stress analysis of a curved beam plate. The technique used here requires four phase stepped photoelastic images obtained from a circular polariscope by rotating the analyzer at 0˚, 45˚, 90˚ and 135˚. Experimental results are compared with those of ANSYS and calculated by the simple beam theory. Good agreement among the results can be observed.
박형 결정질 실리콘 태양전지에서의 휨현상 감소를 위한 알루미늄층 두께 조절
백태현(Tae-Hyeon Baek),홍지화(Ji-Hwa Hong),임기조(Kee-Joe Lim),강기환(Gi Hwan Kang),유권종(Gwon-Jong Yu),송희은(Hee-eun Song) 한국태양에너지학회 2012 한국태양에너지학회 학술대회논문집 Vol.2012 No.3
Crystalline silicon solar cell remains the major player in the photovoltaic marketplace with 90 % of the market, despite the development of a variety of thin nlm technologies. Silicon's excellent efficiency, stability, material abundance and low toxicity have helped to maintain its position of dominance. However, the cost of silicon photovoltaic remains a major barrier to reducing the cost of silicon photovoltaics. Using the crystalline silicon wafer with thinner thickness is the promising way for cost and material reduction in the solar cell production. However, the thinner thickness of silicon wafer is, the worse bow phenomenon is induced. The bow phenomenon is observed when two or more layers of materials of different temperature expansion coefficiencies are in contact, in this case silicon and aluminum. In this paper, the solar cells were fabricated with different thicknesses of Al layer in order to reduce the bow phenomenon. With lower paste applications, we observed that the bow could be reduced by up to 40% of the largest value with 130 micron thickness of the wafer even though the cnversion efficiency decrease of 0.5 % occurred. Since the bowed wafers lead to unacceptable yield losses during the module construction, the reduction of bow is indispensable on thin crystalline silicon solar cell. In this work;, we have studied on the counterbalance between the bow and cnversion efficiency and also suggest the formation of enough back surface field (BSF) with thinner Al paste application.
결정질 실리콘 태양전지의 스크린 프린팅 공정 최적화 연구
백태현(Tae-Hyeon Baek),홍지화(Ji-Hwa Hong),최성진(Sung-Jin Choi),임기조(Kee-Joe Lim),유권종(Gwon-Jong Yu),송희은(Hee-eun Song) 한국태양에너지학회 2011 한국태양에너지학회 학술대회논문집 Vol.2011 No.4
In this paper, we studied the optimization of the screen pringting method for crystalline silicon solar cell fabrication. The 156 * 156 mm2 p-type silicon wafers with 200 ㎛ thickness and 0.5-3 Ω ㎝ resistivity were used after texturing, doping, and passivation. Screen printing method is a common way to make the c-Si solar cell with low-cost and high-efficiency. We studied the optimized condition for screen printing with crystalline silicon solar cell as changing the printing direction (finger line or bus bar), finger width, and mesh angle. As a result, the screen printing with finger line direction showed higher finger height and better conversion efficiency, compared with one with bus bar direction. The experiments with various finger widths and mesh angles were also carried out. The characteristics of solar cells was obtained by measuring light current-voltage, optical microscope and electroluminescence.
사상체질(四象體質)과 비만(肥滿)의 상관성에 관한 임상적 연구
김달래,백태현,Kim, Dal-Rae,Baek, Tae-Hyeon 사상체질의학회 1996 사상체질의학회지 Vol.8 No.1
연구 목적 : 복지부 발표 '1993년도 대한민국 국민들의 영양상태'보고서를 보면 1인당 섭취열량은 1969보다 257Kcal가 줄어든 것으로 나타났다. 그런데도 불구하고 일부의 사람들은 과도한 열량을 섭취하고 있기 때문에 비만인 사람이 점점 늘어나고 있다. 그렇다보니 신문이나 잡지에서는 거의 매일 살빼는 약이나 신종 다이어트방법에 대한 광고와 기사를 앞다투어 내보내고 있는 실정이다. 비만증은 근래에 발병률이 현저히 증가하면서 중풍, 당뇨병, 고혈압, 암, 간경화증, 당석증 등의 만성질환의 이환율을 증가시키고, 관절에 큰 부담을 주어 골관절염을 보다 빠르게 진전시키며, 사람들의 수명을 단축시키는 등 심각한 건강상의 문제를 일으키고 있다. 또한 비만증은 용모의 손상을 일으켜 정신적인 스트레스의 주요 인자로 등장하고 있기도 하다. 비만인이 증가하는 원인으로는 서구화된 음식습관으로 동물성 지방질과 단백질의 섭취증가, TV 자동차 세탁기 오디오 리모콘 등 생활이기의 사용으로 인한 운동부족, 체질과 질병 등이 재기되고 있다. 이제까지 비만을 치료하기 위한 많은 시도가 있었으나 주된 이론은 섭취음식의 절재와 운동량을 증가시키는 것이었으며, 체질적인 요소를 중심으로 비만증을 해결하려는 시도는 없었다. 이에 저자는 1992년 8월 20일부터 1995년 8월 19일까지 만 3년동안 상지대학교 부속한방병원 체질의학과에서 치료받는 461명의 환자를 대상으로 사상체질과 비만과의 상관성을 임상적으로 연구하고 그 효과를 보고하는 바이다. 연구 결론 : 상지대학교 부속한방병원에 내원치료를 받고 있는 비만증환자들을 대상으로하여 체질과 비만과의 관계를 연구한 결과는 다음과 같다. 1. 비만증 환자의 70.2%가 태음인이었다. 2. 치료결과 4주동안에는 $1.48{\pm}1.64kg$, 5주부터 8주동안에는 $2.05{\pm}2.10kg$, 9주부터 12주동안에는 $2.18{\pm}2.27kg$, 13주부터 16주동안에는 $2.08{\pm}2.88kg$이 감량되었다. 3. 체중감량에 있어 태음인이 가장 많은 감소를 보였다. 연령별로는 10대에서 가장 많은 감소를 보였다. 4. 비만환자의 혈액 가운데 총 콜레스테롤, 저밀도 지방단백이 높온 사람보다 유리지방산과 중성지방이 높은 경우가 대부분을 차지했다. 5. 비만인의 혈청지질에서는 FFA, TG가 높았다. 그 이유는 육식보다는 당질과 지방질의 섭취로 나타난 것이었다.
하장,백태현,공경환,Ha, Jang,Baek, Tae-Hyeon,Kong, Kyung-Hwan 대한한방내과학회 2000 大韓韓方內科學會誌 Vol.21 No.5
Objective : The study was to investigate Diagnosis and Treatment Based on an Overall Analysis of Signs and Symtoms(證治) of a patient on stomach cancer stage IV by means of the clinical symptoms. Methods : The observation of the clinical progress was carried out by conducting Diagnosis and Treatment Based on an Overall Analysis of Signs and Symtoms(證治) with the patient diagnosed stomach cancer stage IV. Results : Treatments such as the invigoration of qi(補氣), the flow of qi(行氣), and the relieving pain(止痛) was given because the patient showed the qi deficiency of the spleen and stomach(脾胃氣虛). There were moderate effects for anorexia, indigestion, nausea, and general weakness, but there was not any clear effect for alleviation of abdominal pain except the first period. Specially, compared with two hospitalization treatments in 1998, the third hospitalization treatment did not show any apparent improvement. It was believed that this caused by the patients bodily weakness because of deterioration of anemia from bleeding in the progress of cancer. Conclusion : Diagnosis and treatment based on an overall analysis of signs and symtoms(證治) of a patient on stomach cancer stage IV had moderate effects on the improvement of the patients condition, but in this case we had difficulty in long-term observation because of short hospitalizations or insufficient examination by an oriental-western combined medicine group.