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$Cu_2(OH)_3(CH_3COO){\cdot}H_2O$로 부터 마이크로파를 이용한 $Cu_2O$와 Cu의 합성
송하철,허영덕,Song, Ha-Chul,Huh, Young-Duk 한국결정성장학회 2006 한국결정성장학회지 Vol.16 No.4
[ $Cu_2O$ ] and Cu have been synthesized from the layered organic-inorganic hybrid, $Cu_2(OH)_3(CH_3COO){\cdot}H_2O$, assisted by microwave irradiation. $Cu_2O$ is formed in aqueous glucose solution, while metallic Cu is formed in ethylene glycol by reduction of $Cu_2(OH)_3(CH_3COO){\cdot}H_2O$. The influence of microwave irradiation time and concentration of glucose on $Cu_2O$ particles formation and growth has been examined. The morphologies of $Cu_2O$ particles change from spheres with a few fm size to nanowires with diameter of 40 nm as increasing the microwave irradiation times. 층상 구조의 유기-무기 복합 소재 $Cu_2(OH)_3(CH_3COO){\cdot}H_2O$에 마이크로파를 조사하면서 $Cu_2O$와 Cu를 합성하였다. 에틸렌 글리콜에서는 $Cu_2(OH)_3(CH_3COO){\cdot}H_2O$이 환원이 되어서 Cu금속이 형성되는 반면에, 수용액에 글루코오스를 넣으면$Cu_2(OH)_3(CH_3COO){\cdot}H_2O$이 환원이 되어 $Cu_2O$가 형성되었다. 마이크로파 조사시간과 글루코오스의 농도가 $Cu_2O$의 입자의 생성과 성장에 미치는 영향을 확인하였다. 마이크로파의 조사시간이 길어질수록 $Cu_2O$의 입자는 수 ${\mu}m$의 구형에서 40nm의 지름을 가진 나노 선으로 변함을 확인하였다.
Gravure off-set 인쇄법을 적용한 고효율 다결정 실리콘 태양전지
김동주(Dong Ju Kim),김정모(Jung Mo Kim),배소익(So-Ik Bae),전태현(Tae Hyun Jun),송하철(Ha-chul Song) 한국태양에너지학회 2011 한국태양에너지학회 학술대회논문집 Vol.2011 No.4
The most widely used method to form an electrode in industrial solar cells are screen printing. Screen printing is characterized by a relatively simple and well-known production sequence with high throughput rates. However the method is difficult to implement a fine line width of high-efficiency solar cells can not be made. The open circuit voltage(Voc) and the short circuit current density(Jsc) and fill factor(FF) need to be further improved to increase the efficiency of silicon solar cells. In this study, gravure offset printing method using the multicrystalline-silicon solar cells were fabricated. Gravure off-set printing method which can print the fine line width of finger electrode can have the ability reduce the shaded area and increase the Jsc. Moreover it can make a high aspect ratio thereby series resistance is reduced and FF is increased. Approximately 50㎛ line width with 35㎛ height was achieved. The efficiency of gravure off set was 0.7% higher compare to that of scree printing method.