SEMICONDUCTOR DEVICE MANUFACTURING METHOD

A method of manufacturing a semiconductor device is provided in which a substrate is thinned and a semiconductor region made of a fine pattern is formed. The method of manufacturing of a semiconductor device (101) includes: a fine pattern forming step of forming p-type impurity regions (3, 4) and surface ohmic contact electrodes (5), which are made of fine patterns, using a photolithography method in which a stepper is used, after forming an N-type epitaxial layer (2) on a SiC single-crystal substrate (1); a protective film planarizing step of forming a protective film so as to cover the surface ohmic contact electrodes (5) and performing planarization of the protective film; a substrate thinning step of thinning the SiC single-crystal substrate (1); a backside ohmic contact electrode forming step of forming a backside ohmic contact electrode (7) on the SiC single-crystal substrate (1); a surface Schottky contact electrode forming step of forming a Schottky metal portion (8) connected to the p-type impurity regions (3, 4) and the surface ohmic contact electrodes (5); and a step of forming a surface pad electrode (9) that covers the Schottky metal portion (8).