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Damage induced by ion irradiation in CoSi_2 layers on SiO_2 films has been investigated. CoSi_2 layers with 25 nm thickness were irradiation with 25 keV Ar^+ ions to a dose of 2×10^<14> cm^<-2> with v...arious dose rate. Pulsed irradiation with various duty ratios was also employed. After the irradiation, the change in sheet resistance of the layers was evaluated. The increase in the resistance increased with increasing the dose rate for samples irradiated with dose rates above the critical value of 7.5×10^<11> cm^<-2> s^<-1> at room temperature. The increase has been discussed on the basis of our proposed model and attributed to the overlapping of cascade zones induced by irradiation with dose rates above the critical value. The result of the pulsed irradiation showed that the incremental sheet resistance decreases with increasing the irradiation temperature, and the relaxation time was estimated at shorter than 200 μs at room temperature. Higher irradiation temperature and lower dose rate than the critical value result in the lower resistivity CoSi_2 layers.続きを見る
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