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A Study on the Electrical Characteristic Analysis of c-Si Solar Cell Diodes
Choi, Pyung-Ho,Kim, Hyo-Jung,Baek, Do-Hyun,Choi, Byoung-Deog The Institute of Electronics and Information Engin 2012 Journal of semiconductor technology and science Vol.12 No.1
A study on the electrical characteristic analysis of solar cell diodes under experimental conditions of varying temperature and frequency has been conducted. From the current-voltage (I-V) measurements, at the room temperature, we obtained the ideality factor (n) for Space Charge Region (SCR) and Quasi-Neutral Region (QNR) of 3.02 and 1.76, respectively. Characteristics showed that the value of n (at SCR) decreases with rising temperature and n (at QNR) increases with the same conditions. These are due to not only the sharply increased SCR current flow but the activated carrier recombination in the bulk region caused by defects such as contamination, dangling bonds. In addition, from the I-V measurements implemented to confirm the junction uniformity of cells, the average current dispersion was 40.87% and 10.59% at the region of SCR and QNR, respectively. These phenomena were caused by the pyramidal textured junction structure formed to improve the light absorption on the device's front surface, and these affect to the total diode current flow. These defect and textured junction structure will be causes that solar cell diodes have non-ideal electrical characteristics compared with general p-n junction diodes. Also, through the capacitance-voltage (C-V) measurements under the frequency of 180 kHz, we confirmed that the value of built-in potential is 0.63 V.
CAE를 이용한 대형 상용차 배기계의 구조적 특성에 관한 연구
허덕재(Deog-Jae Hur),김병곤(Byoung-Gon Kim),최석환(Seok-Hwan Choi) 한국자동차공학회 1994 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
In this study. a CAE techinique is developed in order to identify and optimize the characteristics of a heavy truck exhaust system. Under the given three loading conditions. the strength is investigated through static stress analysis along with parameter optimization. The dynamic performance is also evaluated by modal analysis. For the simplification and idealization of bellows in F. E. model. three ways of modeling techique are attempted and the results are compared.<br/>
변압기형 초전도 한류기의 사고유형에 따른 전류제한특성 분석
김덕구(Deog-Goo Kim),조용선(Yong-Sun Cho),최효상(Hyo-Sang Choi),정병익(Byoung-Ik Jung),최수근(Soo-Geun Choi),하경훈(Kyoung-Hun Ha),고성필(Sung-Pil Go) 한국조명·전기설비학회 2011 한국조명·전기설비학회 학술대회논문집 Vol.2011 No.5월
In the transformer-type superconducting fault current limiter (SFCL), the neutral line connects the superconducting units with the secondary windings. The fault current limiting characteristics of the three-phase transformer-type SFCL with a neutral line were analyzed. In the case of the single line-to-ground fault, about 90% of the fault current on the faulted phase was limited. However, in the case of a double line-to-ground fault, the flux from the faulted-phase winding interlinked with the other windings on the faulted and sound phases to create an inductive current, and limited about 70% of the faulted current.