Silicon carbide semiconductor device and method for manufacturing same

A silicon carbide semiconductor device comprising:

• a silicon carbide substrate;
• an oxide film arranged in contact with said silicon carbide substrate;
• a gate electrode arranged in contact with said oxide film such that said gate oxide film is interposed between said gate electrode and said silicon carbide substrate;
• and
• a first electrode and a second electrode arranged in contact with said silicon carbide substrate,
• said first electrode and said second electrode being configured such that a current flowing between said first electrode and said second electrode can be controlled by a gate voltage applied to said gate electrode,
• the difference between a first threshold voltage of said silicon carbide semiconductor device that is measured for the first time and a second threshold voltage of said silicon carbide semiconductor device that is measured after stress has been applied to said silicon carbide semiconductor device continuously for 1000 hours is within ±0.2 V,
• the application of said stress being applying said gate voltage of 45 kHz varying from −5 V to +15 V to said gate electrode, with the voltage of said first electrode being 0 V and the voltage of said second electrode being 0 V.