Patent ID: 8035097
Filing Date: 2011-10-11
Classification: G11C,H01L

Abstract:
1. A phase change memory (PCM), comprising: a semiconductor substrate, having a first conductive type; a plurality of buried word lines, having a second conductive type and disposed in the semiconductor substrate, wherein each of the buried word lines further comprises: a line-shaped main portion, extended along a first direction; and a plurality of protrusion portions, each protruded from one long side of the line-shaped main portion as viewed from the top view; a plurality of doped semiconductor layers, having the first conductive type and disposed on the protrusion portions respectively; a plurality of memory cells, wherein each of the memory cells comprises a phase change material layer and is disposed on and electrically connected to one of the doped semiconductor layers; a plurality of first metal silicide layers, disposed on the line-shaped main portions respectively; and a plurality of bit lines, each connected to memory cells disposed on the buried word lines in a second direction substantially perpendicular to the first direction.