Patent ID: 8772105
Filing Date: 2014-07-08
Classification: H01L

Abstract:
1. A method for forming a semiconductor device comprising: forming a recess by etching a semiconductor substrate; forming an insulation film over a bottom and a sidewall of the recess; forming a bit line over the insulation film; forming a polysilicon layer over the bit line; forming an undoped amorphous silicon layer over the polysilicon layer, the recess sidewall, and the semiconductor substrate; forming a crystalline silicon layer by performing solid phase epitaxy on the undoped amorphous silicon layer; forming a silicon layer over the semiconductor substrate in such a manner that open portions of the recess are filled, the silicon layer being formed by performing a selective epitaxial growth method using the crystalline silicon layer as a seed; forming a first junction region in a bottom portion of the silicon layer by implanting ions in the silicon layer; and forming a pillar by etching the silicon layer, the first junction region and an interlayer insulation film.