Patent ID: 7151035
Filing Date: 2006-12-19
Classification: B29C,H01L

Abstract:
1. A manufacturing method for a semiconductor device, comprising the steps of: (a) forming a first semiconductor region of a first conductivity type over a semiconductor substrate; (b) depositing a first insulation film over a main surface of said semiconductor substrate; (c) depositing a first semiconductor film of a second conductivity type opposite to said first conductivity type over said first insulation film; (d) depositing a third insulation film of a kind different from said first insulation film over said first semiconductor film; (e) depositing a fifth insulation film capable of taking an etching selective ratio to said third insulation film over said third insulation film; (f) opening portions of said fifth insulation film and third insulation film by an etching method using a photoresist film as an etching mask; (g) removing said photoresist film, and thereafter removing said first semiconductor film exposed from the opening by using said fifth insulation film as an etching mask to form a first opening portion in said third and fifth insulation films and said first semiconductor film; (h) forming a sixth insulation film of a kind different from said first insulation film over a side surface of said first opening portion; (i) forming, over said first insulation film, a second opening portion in which a surface opposite to the main surface of said semiconductor substrate and said first semiconductor region in said first semiconductor film are exposed, by selectively etching a portion of said first insulation film through said first opening portion using said third insulation film and sixth insulation film as etching masks; and (j) forming a semiconductor film in said second opening portion, wherein said semiconductor film is formed by joining a second semiconductor film growing from a surface exposed from said second opening portion of said first semiconductor film and a third semiconductor film growing from the main surface of said semiconductor substrate, wherein said second semiconductor film is a poly crystal and said third semiconductor film is a single crystal, and wherein, during a processing for forming said first opening portion, an amount in which a portion of said first insulation film exposed from said first opening portion is etched and a protrusion amount of said sixth insulation film protruding from a surface opposite to the main surface of said semiconductor substrate toward the main surface of said semiconductor substrate in said first semiconductor film are each set to be equal to or smaller than one half of thickness of said first insulation film.