Patent ID: 8440524
Filing Date: 2013-05-14
Classification: C21D,C22F,H01L

Abstract:
1. A method for manufacturing a semiconductor device including a semiconductor substrate composed of silicon carbide, an upper surface electrode which contacts an upper surface of the substrate, and a lower surface electrode which contacts a lower surface of the substrate, the method comprising: (a) forming an upper surface structure on the upper surface side of the substrate, and (b) forming a lower surface structure on the lower surface side of the substrate after the (a), wherein the forming (a) comprises: (a1) forming an interlayer insulating film on the upper surface structure on the upper surface side of the substrate, (a2) depositing an upper surface electrode material layer on the upper surface of the substrate, the upper surface electrode material layer being a raw material layer of the upper surface electrode, and (a3) annealing the upper surface electrode material layer, and the forming (b) comprises: (b1) depositing a lower surface electrode material layer on the lower surface of the substrate, the lower surface electrode material layer being a raw material layer of the lower surface electrode, and (b2) annealing the lower surface electrode material layer with a laser to make an ohmic contact between the lower surface electrode and the substrate wherein the forming of the interlayer insulating film is formed before the depositing (a2).