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KF 후열처리 공정시 CIGS 박막의 Na 원소 존재가태양전지 셀성능에 미치는 영향
손유승(Yu-Seung Son),김원목(Won Mok Kim),박종극(Jong-Keuk Park),정증현(Jeung-hyun Jeong) 한국태양광발전학회 2015 Current Photovoltaic Research Vol.3 No.4
The high efficiency cell research processes through the KF post deposition treatment (PDT) of the Cu(In,Ga)Se₂(CIGS) thin film has been very actively progress. In this study, it CIGS thin film deposition process when KF PDT 300 to the processing temperature, 350, 400°C changed to soda-lime glass (SLG) efficiency of the CIGS thin film characteristics, and solar cell according to Na presence of diffusion from the substrate the effects were analyzed. As a result, the lower the temperature of KF PDT and serves to interrupt the flow of current K-CIGS layer is not removed from the reaction surface, FF and photocurrent is decreased significantly. Blocking of the Na diffusion from the glass substrate is significantly increased while the optical voltage, photocurrent and FF is a low temperature (300, 350°C) in the greatly reduced, and in 400°C tend to reduce fine. It is the presence of Na in CIGS thin film by electron-induced degradation of the microstructure of CIGS thin film is expected to have a significant impact on increasing the hole recombination rate a reaction layer is formed of the K elements in the CIGS thin film surface.
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손상일(Sang Il Son),손유승(Yu Seung Son),김영권(Young Kyon Kim),고승철(Sung Cheol Goh) 한국IT서비스학회 2012 한국IT서비스학회지 Vol.11 No.2
Nowadays, encryption is core technology widely used in IT industry to protect private information of individuals and important intellectual assets of companies. However, when criminals and terror suspects abuse such technology, national security can be threatened and law enforcement can be disturbed. To prevent such adverse effects of cryptography, some nations have enacted legislations that allow legally obtained encrypted data to be decrypted by certain law enforcement agencies. Hence it is imperative that firms having international presence understand and comply by each nation's regulations on decryption order. This paper explains circumstances under which legislations on decryption order were established, organizes countries with regulations and punishment, explores what global enterprises need to consider in making policies to effectively respond to decryption orders, and suggests that technological methods and managerial guidelines for control of encryption be established.
ScienceON
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