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Semilogarithmic characteristics of the Au/STON junction for the voltage cycling of . Arrows indicate the sweeping direction. The inset plot is a schematic for the electrode setting of the sample. Dashed line is a guide for the eyes.
Voltage pulses with the amplitudes of and (a) and the corresponding resistance responses (b). Voltage pulses with amplitudes of , , , , and (c) and the corresponding resistance responses (d). Pulse width is fixed at 1 ms. Bias voltage is 0.1 V for resistance measurement.
Response of photocurrent to light illumination. The black, red, blue, green line represent four different junction states with the resistances of , , , and , respectively. Arrows indicate the variation of photocurrent when the light source is turned on and off (spot size ).
Relationship between the square root of the photoresponse and the photon energy in different junction resistance states. The straight line is a guide for the eyes.
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