Title: Response of electron-irradiated silicon carbide Schottky power diodes at elevated temperature
Authors: Nurul Fadzlin Hasbullah; Mohamad Azim Mohd Khairi; Yusof Abdullah
Addresses: Department of Electrical and Computer Engineering, International Islamic University Malaysia, Kuala Lumpur, 53100, Malaysia ' Department of Electrical and Computer Engineering, International Islamic University Malaysia, Kuala Lumpur, 53100, Malaysia ' Industrial Technology Division, Malaysia Nuclear Agency, Kuala Lumpur, 43000, Malaysia
Abstract: Thermal-dependence experiments were executed on silicon carbide Schottky diodes. Devices were exposed to 3 MeV electrons with 10 MGy dose. Current density-voltage (~300 K to ~490 K) characterisation was used for investigation. At highest tested temperature, forward current at 0.3 V increased approximately seven orders of magnitude for unirradiated; and eight orders of magnitude for irradiated devices due to free carriers generation which obtained energy from the temperature. Series resistance of unirradiated increased with increasing temperature due to decrease in free carriers mobility, whilst irradiated devices decreased with increasing temperature which indicates that more free carriers acquired enough energy to escape the radiation-induced traps. Reverse current increased with increasing temperature due to the radiation-induced defects that act as generation-recombination centres. Activation energies of irradiated is higher than unirradiated devices. Also, there are two slopes in the plot of the activation energy-voltage which suggests that the reverse leakage current is due to two different mechanisms.
Keywords: electron radiation; SiC; Schottky diode; high voltage; temperature dependent; electrical characterisation; activation energy; leakage current mechanism.
International Journal of Power Electronics, 2021 Vol.14 No.2, pp.143 - 155
Received: 22 Sep 2018
Accepted: 28 Jan 2019
Published online: 13 Jul 2021 *