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(a) Schematic of the device operation, (b) I-t curves and (c) I-V curves when the photodetector is illuminated with 633 nm light at an irradiance of 20 mW/cm2 under different conditions (the bias voltage between two electrodes is kept constant at 1 V), (d) multiple cycle operation of the device, (e) and (f) the photocurrent responses with time in the annealed photodectors under illumination of 633 nm in NH3 environment.
