Time Resolution of the 4H-SiC PIN Detector

Abstract

We report the time resolution of 100 µm 4H-SiC PIN detectors which are fabricated by Nanjing University (NJU). The time responses for β particle from 90 Sr source are investigated for the detection of the minimum ionizing particles (MIPs). The influences of different reverse voltages which correspond to carrier velocity and device sizes which correlate with capacitance for time resolution are studied. We acquired a time resolution (94±1) ps for 100 µm 4H-SiC PIN detector. A fast simulation software -RASER (RAdiation SEmiconductoR) has been developed to simulate the time resolution of 4H-SiC detector, and the simulation has been validated by the waveform comparison of RASER simulation and measured data. The simulated time resolution is (53 ± 1) ps after consider the intrinsic leading contributions of detector in time resolution.

Timing Performance Simulation for 3D 4H-SiC Detector

“…We carried out perforation experiments on the same size 3D 4H-SiC detector, which can verify the simulation results in the near future. The simulation of electric field in RASER is obtained by solving Poisson equations and Laplace equations [24] as shown in Figure 2b. The electric field in the central area between two adjacent n + electrodes is weak, which will result in the time response of this part of the signal to be very slow.…”

“…The electric field and weighting potential are calculated by FEniCS [22]. According to the time-resolution measurement β-setup [23,24], we simulated the tracks of two electrons with the same energy as electrons from 90 Sr source and the deposited energy in detectors with the max step length less than 1 µm by GEANT4 [25]. The current induced by electron-hole (e-h) pairs moving is calculated by Shockley-Ramo's theorem [26].…”

“…We validated RASER by comparing measured and simulated time-resolution results of planar 4H-SiC detectors [24]. The planar 4H-SiC detectors are designed by Nanjing University (NJU), and the cross section of the detector is shown in Figure 1.…”