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Sheet conductivities of -doped C12A7 as a function of an electron-beam irradiation time. The current density is 15 pA or 150 pA . The inset is a schematic illustration of the experimental setup. and represent the current source terminals and and , the voltmeter terminals.
Absorption spectra of -doped single crystal before (dashed line) and after (solid line) EB irradiation with a dose of (150 pA for 10 h). Reflection losses due to the crystal surface and Al electrodes were corrected. The inset is an optical micrograph of the EB-irradiated sample that demonstrates the green coloration at the EB-irradiation area. The image was processed to enhance the green color.
Calculated carrier electron concentration profiles as a function of the irradiation dose with parameters: , , , , and . The value was determined by comparing to experimental data (see Fig. 4).
Experimental and theoretical sheet conductivity changes against the EB-irradiation dose. Circles and squares correspond to data for 15 pA and 150 pA , respectively. Theoretical curves for different yields were calculated using the same parameter values as in Fig. 3.
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