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Design and Evaluation of a Compact Silicon Carbide Photoconductive Semiconductor Switch

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3 Author(s)
James, C. ; Dept. of Electr. & Comput. Eng., Texas Tech Univ., Lubbock, TX, USA ; Hettler, C. ; Dickens, J.

A high-power vertical photoconductive switch was fabricated from a high-purity semi-insulating 4H-SiC wafer. The device was fabricated from an as-grown wafer with resistivity >; 109 Ω · cm and had a dark resistance of greater than 6 × 109 Ω. The switch was operated at 15 kV/cm and achieved a peak photocurrent of 14 A into a 25-Ω load. Optimization of the excitation wavelength and switch geometry using an optical parametric oscillator was studied in order to decrease the laser requirements for optical triggering. This has led to a decrease in ON-state resistance of almost two orders of magnitude for similar excitation energy levels at visible wavelengths. This work forms the basis for developing very compact high-voltage photoconductive switches.

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Electron Devices, IEEE Transactions on  (Volume:58 ,  Issue: 2 )