IEEE Transactions on Electron Devices · 2010 · 45 citations · 8 references
EngineeringElectrical EngineeringMaterials ScienceElectronic MaterialsOptoelectronicsSemiconductor DevicesOptical Properties Of SemiconductorsOptical SwitchingOptoelectronic DevicesOptoelectronic MaterialsPhotonic Integrated CircuitsSilicon PhotonicsOptical Parametric AmplificationOptical Parametric OscillationOptical Parametric OscillatorsOptical SwitchesPhotocurrent GenerationPhotodetectionPhotonic SwitchesState Resistance
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 >; 10 <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">9</sup> Ω · cm and had a dark resistance of greater than 6 × 10 <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">9</sup> 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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4H–SiC photoconductive switching devices for use in high-power applications
S. Doğan, Ali Teke, Daming Huang et al. · Applied Physics Letters · 2003 · 116 citations