The Relative Effectiveness of Various Radiation Sources on the Resistivity Change in n-Type Silicon
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Jung Wun,
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( Jung Wun )
Korea Institute of Science and Technology Solid State Physics Laboratory
KMID : 0371819690010020091
Abstract
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Resistivity changes of n-type float-zone silicon crystals with 6.4X1014 to 1.25X1017 phos¡©phorus atoms/cm3 due to irradiation by (1) 1 MeV electrons, (2) two types of research reactors, and (3) Co60 r-ray sources were investigated. The results were analyzed on the basis of a simple exponential formula derived by Buehler. While the formula gave a fair fit in :he low fluence range in most cases, the deviation was quite appreciable in the case of 1 electron irradiation, and a linear change gave better fit in some cases. The large change in the carrier femoval rate in electron-irradiated samples in the high fluence range was analyzed in detail in terms of the Fermi level cross-over of the defect levels. Based on the damage constants evaluated from the initial portion of data where the formula was applicable, the relative effectiveness of various radiation sources in causing the resistivity change in n-type silicon was compared. The TRIGA Mark II reactor neutrons, for example, were found to be about 40 times more effective than 1 MeV electrons. The dependence of the damage cons:ant on the initial carrier concentration was also examined. The physical basis of the exponemial law and the effect of the Fermi level cross-over of the defect levels on the resistiviry change in the high fluence ranges are discussed.
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