Department of Physics, Ahmadu Bello University, Zaria, Nigeria; Department of Physics, South East Physics Network (SEPnet), University of Surrey, Guildford, United Kingdom
Abubakar, Y.M., Department of Physics, Ahmadu Bello University, Zaria, Nigeria, Department of Physics, South East Physics Network (SEPnet), University of Surrey, Guildford, United Kingdom; Lohstroh, A., Department of Physics, South East Physics Network (SEPnet), University of Surrey, Guildford, United Kingdom; Sellin, P.J., Department of Physics, South East Physics Network (SEPnet), University of Surrey, Guildford, United Kingdom
The alpha spectroscopy performance and electric current stability of 4H-silicon carbide Schottky devices with 50μm epitaxial layer was examined at temperatures between 300 to 500 K at 50 K intervals. An activation energy of 5.98 ± 0.64meV was extracted from temperature dependent resistivity measurements. The Schottky barrier height decreases from 1.33 eV at 300 K to 1.11 eV at 500 K and the ideality factor increases from 1.17 at 300 K to 1.79 at 500 K. The reverse bias leakage currents stabilizes faster at higher temperatures. The charge collection efficiency is above 90% for temperatures up to 500 K. Pulse height spectra collected for 24 hours at constant voltage and temperature show improvements with time within the first 8 hours and remained stable for the remainder of the acquisition time. The peak width of the alpha spectra reduces significantly with increasing temperature at applied bias voltages below 50 V, which indicates that leakage currents are not the limiting factor in those conditions even at 500 K in our set up. So far, the devices indicate reasonable stability for extended periods of operation and highlight possible applications in harsh radiation media. © 1963-2012 IEEE.
Activation energy; Leakage currents; Schottky barrier diodes; Silicon carbide; Applied bias voltage; Charge collection efficiency; Increasing temperatures; Pulse height spectrum; Reverse bias leakage current; Schottky barrier heights; Silicon carbide particles; Temperature-dependent resistivity; Bias voltage