Patent ID: 9728606
Date: 2017-08-08
CPC Classifications: H01L

Claim:
1. A fabrication method of a silicon carbide semiconductor element that includes a drift layer playing a role of retaining a high withstand voltage on a front side of a semiconductor substrate of silicon carbide and including an ohmic electrode on a backside, the fabrication method comprising: forming one or more slit-shaped grooves in an element active region on a surface of the semiconductor substrate on a side opposite of the drift layer before forming the ohmic electrode on the backside of the semiconductor substrate; the one or more slit-shaped grooves are formed by a dicing blade; and the dicing blade is applied directly to a furthest most edge of a first end of the semiconductor substrate and across a certain direction of the semiconductor substrate which is perpendicular to a surface of the substrate contacting the drift layer, and the dicing blade is separated from the semiconductor substrate before reaching a second end of the semiconductor substrate on a side opposite to an incident direction of the dicing blade so as to maintain an un-diced substrate peripheral portion; and a distance between the one or more slit-shaped grooves is made smaller than a thickness of the dicing blade such that an entire surface directly underlying the backside of the semiconductor element is made thinner leaving the un-diced substrate peripheral portion.