Simulation of 4H-SiC detectors for ultra fast particle spectroscopy

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Abstract
We present a study on the high speed detection capability of Nickel/4H-SiC Schottky junctions for protons and alpha particles with different energies in the MeV range. The particle path and the distribution of the deposited energy were calculated by SRIM. The detector current signals are calculated by adding the contributions of all generated charge along the particle path. The voltage signals across a 50 Ω resistor load are also derived considering the detector capacitance. Simulations have been performed for different particle energies and detector bias voltages. The fastest simulated response to a 5.5 MeV alpha particle shows a rise-time of 330 ps and a pulse width of 730 ps FWHM, which are in good agreement with experimental values. Similar values have been predicted for 2 MeV protons.