Patent ID: 8772121
Filing Date: 2014-07-08
Classification: H01L

Abstract:
1. A method of manufacturing a phase change memory device, the method comprising: forming a lower electrode layer pattern on a substrate; forming an insulating interlayer covering the lower electrode layer pattern on the substrate; partially removing the insulating interlayer to form a first opening, the first opening exposing the lower electrode layer pattern; forming an oxide layer on the lower electrode layer pattern and on a sidewall of the first opening; partially removing the oxide layer and the lower electrode layer pattern to form an oxide layer pattern on the sidewall of the first opening and a lower electrode under the oxide layer pattern; forming an insulation layer filling a remaining portion of the first opening on the substrate; removing the oxide layer pattern by a wet etching process to form a second opening, the second opening exposing a top surface of the lower electrode; and forming a phase change material pattern on the lower electrode such that the phase change material pattern fills the second opening.