Abstract
The nanosecond optoelectronic switching characteristics of type IIa diamond illuminated by pulsed UV radiation from an excimer laser at λ=193 nm are reported. With sputtered titanium contacts, certain electro-optical conditions produce a secondary current peak which follows the primary photocurrent pulse. When the bias voltage is increased further (with the laser excitation intensity being kept constant), the primary and secondary current pulses merge together, and their combined peak value is observed to have a supralinear increase with respect to bias voltage. The threshold voltages for secondary pulse formation are also shown to decrease with respect to increasing laser excitation intensities. Secondary current pulse formation and decay are shown to be consistent with a model of space-charge-assisted Fowler–Nordheim electron tunneling across the reversed-biased negative Ti/C electrode.
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