Patent ID: 9263267
Filing Date: 2016-02-16
CPC Classification: H01L

Claim Text:
1. A manufacturing method of a silicon carbide semiconductor device including a semiconductor substrate that has a main surface and a rear surface being an opposite surface of the main surface and is made of single crystal silicon carbide and a first electrode that forms an ohmic junction with the semiconductor substrate, comprising: preparing the semiconductor substrate; forming a metal thin film that is made of electrode material including an impurity, at a portion of the semiconductor substrate where the first electrode is to be formed; and forming the first electrode that includes a metal reaction layer in which the impurity is introduced, by irradiating the metal thin film with a laser light after forming the metal thin film, thereby concurrently diffusing a metal atom that forms the metal thin film and the impurity that is included in the metal thin film, and forming the metal reaction layer in which the metal atom reacts with at least one of carbon or silicon that forms the semiconductor substrate.