Photoconductive Semiconductor Switch (PCSS) Recovery
SANDIA NATIONAL LABS ALBUQUERQUE NM
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Attempts to use photoconductive semiconductors as high-power 10-100 kV, 0.1-2 kA toggling switches with recovery times of 5-I 00 ns have stimulated the exploration of their recovery mechanisms. We have observed that optically triggered GaAs switches exhibit lock-on, i.e., when triggered. they do not recover as long as they are holding more than 4-8 kVcm. Experiments are being performed to determine the minimum recovery time of these switches after lock-on, by immediately reducing their fields or currents. As an alternative to GaAs, Si is a semiconductor that does not exhibit lock-on. It has a very long recovery time 100 micro s that can be shortened to less than 100 ns with highly concentrated gold doping 10expn 15cmexpn 3. Device models that predict the behavior of PCSS and experiments on the recovery of GaAs and AuSi switches are presented.
- Electrical and Electronic Equipment
- Electrooptical and Optoelectronic Devices
- Electricity and Magnetism