Patent ID: 7888667
Filing Date: 2011-02-15
Classification: G11C,H01L,Y10S

Abstract:
1. A phase change memory device, comprising: a mold layer disposed on a substrate; a substantially cylindrical heating electrode disposed in an opening in the mold layer, and the heating electrode having a bottom portion disposed on the substrate and a sidewall conformally disposed on an inner wall of the opening; a filling insulation pattern in the opening, the filling insulation pattern surrounded by the sidewall of the heating electrode; a cylindrical gap region in the mold layer, the cylindrical gap region defined by an upper portion of the inner wall of the opening, a top surface of the sidewall of the heating electrode and an outer wall of the filling insulation pattern; and a phase change material pattern disposed on the mold layer and the filling insulation pattern, and disposed in the cylindrical gap region, the phase change material pattern contacting the top surface of the sidewall of the heating electrode, wherein the top surface of the sidewall of the heating electrode is lower than a top surface of the mold layer, and a contacting interface between the heating electrode and the phase change material pattern is located inside the opening.