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http://dx.doi.org/10.5757/JKVS.2012.21.5.225

Investigation of Proton Irradiated Effect on n, p type Silicon by Positron Annihilation Method  

Lee, C.Y. (Department of Physics, Hannam University)
Publication Information
Journal of the Korean Vacuum Society / v.21, no.5, 2012 , pp. 225-232 More about this Journal
Abstract
It is described that the proton beam induceds micro-size defects and electronic deep levels in n or p type single crystal silicon. Positron lifetime and Coincidence Doppler Broadening Positron Annihilation Spectroscopy were applied to study of characteristics of p type and n type silicon samples. In this investigation the numerical analysis of the Doppler spectra was employed to the determination of the shape parameter, S, defined as the ratio between the amount of counts in a central portion of the spectrum and the total counts of whole spectrum. The samples were exposed by 3.98 MeV proton beams ranging between 0 to ${\sim}10^{14}$ particles. The S-parameter values strongly depend on the irradiated proton beam, that indicated the defects generate more. Positron lifetime shows that positrons trapped in vacancies and lifetime ${\tau}_2$ increased according to proton irradiation.
Keywords
Proton beam; S-parameter; Positron lifetime; Coincidence doppler broadening positron annihilation spectroscopy; n, p type Si;
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