(a) The normalized steady-state photo responsivity spectra as a function of wavelength for the as-received STOsingle crystals. The insetis thebias dependence of the photocurrent responsivities. (b) The ultraviolet-visible absorption spectrum of STO single crystals as a function of wavelength.
The current-voltage curves in log scale of STO single crystals under the irradiation of light at different temperatures.
(a) The temperature dependence of the resistance of bare STO single crystals with and without the light irradiations. (b) The photoinduced relative change in resistance as a function of temperature. The inset shows that resistance vs. temperature curve of STO single crystals under the light irradiation. The solid line is the best fit to the data.
(a) The time dependence of the resistance of STO single crystals under the irradiation of 365 nm. (b) The time constants as a function of temperature. The inset shows the ln vs. T −1 curve.
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