Patent ID: 8530875
Filing Date: 2013-09-10
Classification: H01L

Abstract:
1. A phase change memory comprising: a phase change memory element including a phase memory material in contact with a first heater having a first cross-sectional area, the first heater adjacent to a second heater having a second cross-sectional area different than the first cross-sectional area such that a ledge is defined between a perimeter of the first heater and a perimeter of the second heater at an interface of the first and second heaters, and wherein the first heater has a third cross-sectional area different than the first and second cross-sectional areas; and an ovonic threshold switch over the phase change memory element, the ovonic threshold switch including: a first electrode over the phase memory material; a chalcogenide layer in contact with the first electrode; a carbon layer overlaying the chalcogenide layer; and a second electrode over the carbon layer, the second electrode including at least two metal nitride layers separated by an intervening metal layer.