Patent ID: 9449814
Filing Date: 2016-09-20
CPC Classification: H01L

Claim Text:
1. A manufacturing method of a semiconductor device, comprising: preparing a monocrystalline silicon carbide substrate having a drift layer; performing ion-implantation on a front surface of the monocrystalline silicon carbide substrate; forming a first carbon film on a back surface of the monocrystalline silicon carbide substrate; forming a second carbon film on the front surface of the monocrystalline silicon carbide substrate; and performing activation annealing of the ion-implanted monocrystalline silicon carbide substrate, wherein the first and second carbon films are each formed on the monocrystalline silicon carbide substrate prior to said activation annealing, and wherein said first and second carbon films disposed on both surfaces of the monocrystalline silicon carbide substrate are maintained during said activation annealing.