Patent ID: 8614117
Filing Date: 2013-12-24
Classification: H01L

Abstract:
1. A method to prevent a gate contact from electrically connecting to a source contact for a plurality of memory cells on a substrate, the method comprising: etching a gate contact region into the substrate; depositing the insulating material into the gate contact region after etching the gate contact region; etching the insulating material in the gate contact region to form the layer of insulating material; forming a pair of pillars over the insulating material on the gate contact region of the substrate; depositing an electrically conductive gate material between and over the pillars; etching the gate material such that the gate material partially fills a space between the pair of pillars, the gate material forming a word line for the memory cells; and depositing a gate contact between the pair of pillars such that the gate contact is in electrical contact with the gate material; and wherein the memory cells are phase change memory cells.