Patent ID: 6545903
Filing Date: 2003-04-08
Classification: H01L

Abstract:
A memory cell for storage and retrieval of information in a memory device, comprising:volume of phase change material disposed in a semiconductor device and comprising a generally planar upper surface and a generally planar lower surface and a memory region comprising a portion of the volume of phase change material extending between an upper portion of the upper surface and a lower portion of the lower surface; first high resistivity material at least partially overlying the volume of phase change material and comprising a first intermediate resistivity portion contacting the upper portion of the upper surface of the memory region; and second high resistivity material at least partially underlying the volume of phase change material and comprising a second intermediate resistivity portion contacting the lower portion of the lower surface of the memory region; wherein phase change material in the memory region and the first and second intermediate resistivity portions form an electrical path for storage and retrieval of information in the memory cell.