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Self-aligned resistive plugs for forming memory cell with phase change material

  • US 6,545,903 B1
  • Filed: 12/17/2001
  • Issued: 04/08/2003
  • Est. Priority Date: 12/17/2001
  • Status: Expired due to Term
First Claim
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1. 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.

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