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Schematic diagram of the -based UV photodetector in top view (a) and side view (b).
Spectral response of the UV photodetector measured with an incident optical power in the range of and at bias voltages between 5 and 100 V. The responsivity has a cut-off at 365 nm and a maximum at 312 nm of 70 A/mW for 100 V. The UV/VIS contrast is .
I-V characteristics in a bias voltage range up to 100 V under illumination with different optical power densities between and at a wavelength of 355 nm. The inset shows the corresponding dark current.
Photocurrent transient at a bias voltage of 100 V. The photodetector was illuminated with a 10 Hz signal of 10 ms pulses by a 345 nm LED. The response time was determined by a stretched exponential fit of the photocurrent decay and is 6 ms.
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