Patent ID: 7964472

Claim:
A method of producing a semiconductor device comprising: forming a mask having a first opening and a second opening wider than the first opening on a principal surface of a first conductivity type semiconductor substrate; etching semiconductor portions of the first conductivity type semiconductor substrate exposed in the first and second openings to thereby form a first trench in the first opening and form a second trench deeper than the first trench in the second opening, wherein a width of the second trench is larger than a width of the first trench; and then filling the first and second trenches with a second conductivity type semiconductor to concurrently form an alignment marker for device production and a junction structure of alternate arrangement of the first conductivity type semiconductor and the second conductivity type semiconductor wherein the first and second trenches are filled directly by epitaxially growing the second conductivity type semiconductor so that an upper end portion of the second trench remains not filled with the second conductivity type semiconductor while the first trench is filled with the second conductivity type semiconductor.