Patent ID: 8901532

Claim:
A non-volatile programmable device comprising: a first metal layer formed on a semiconductor substrate; a first threshold switching layer formed on a portion of the first metal layer; a second metal layer formed on the first metal layer and the first threshold switching layer, wherein a first portion of an insulating layer is interposed between the first metal layer and the second metal layer, and a second portion of the insulating layer is interposed between the first threshold switching layer and the second metal layer; a phase change layer formed through the second metal layer and the insulating layer, and connected to the first threshold switching layer; a second threshold switching layer formed on the phase change layer; a third metal layer that is connected to the first metal layer; and a fourth metal layer formed on the second threshold switching layer, wherein the third metal layer and the fourth metal layer are first and second terminals connected to the first threshold switching layer and the second threshold switching layer, respectively, and a side portion of the second metal layer and another side portion opposite to the side portion of the second metal layer are third and fourth terminals which are respectively connected to the phase change layer, wherein a material of the phase change memory layer is different from a material of the first threshold switching material layer, and the material of the phase change layer is different from a material of the second threshold switching layer.