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펨토초 및 나노초 레이저를 이용한 박막태양전지의 레이저 플라즈마 분광 분석
이석희,최장희,정성호,Lee, S.H.,Choi, J.H.,Gonzalez, J.J.,Hou, H.,Zorba, V.,Russo, R.E.,Jeong, S.H. 한국레이저가공학회 2014 한국레이저가공학회지 Vol.17 No.4
In this work, the application of laser induced breakdown spectroscopy (LIBS) for the composition analysis of thin $Cu(In,Ga)Se_2$ (CIGS) solar cell films ($1-2{\mu}m$ thickness) is reported. For the ablation of CIGS films, femtosecond (fs) laser (wavelength = 343nm, pulse width = 500fs) and nanosecond (ns) laser (wavelength = 266nm, pulse width = 5ns) were used under atmospheric environment. The emission spectra were detected with an intensified charge coupled device (ICCD) spectrometer and multichannel CCD spectrometer for fs-LIBS and ns-LIBS, respectively. The calibration curves for fs-LIBS and ns-LIBS intensity ratios of Ga/Cu, In/Cu, and Ga/In were generated with respect to the concentration ratios measured by inductively coupled plasma optical emission spectrometry (ICP-OES).
신상호(S-H Shin),최장희(J-H Choi),유기영(K-Y Yoo) 대한전자공학회 2010 대한전자공학회 학술대회 Vol.2010 No.6
Generally, the generated pseudorandom numbers by cryptographically secure pseudorandom number generators (CSPRNGs) have the randomness of high quality. The randomness quality of these CSPRNGs is evaluated by ENT, DIEHARD test suites and FIPS SP800-22. In this paper, these test suites are introduced, and the properties of these are analyzed. Also, well-known CSPRNGs are evaluated by ENT, DIEHARD test suites and FIPS SP800-22. As the results of test suites, the randomness qualities of tested CSPRNGs are evaluated.