Patent ID: 7803657
Filing Date: 2010-09-28
Classification: H01L

Abstract:
1. A method of manufacturing a variable resistance structure, comprising: forming a first insulation layer on a substrate having a contact region; forming a contact hole exposing the contact region through the first insulation layer; forming a first conductive layer on the first insulation layer to fill up the contact hole; forming a first protection layer pattern on the first conductive layer; partially etching the first conductive layer using the first protection layer pattern as an etching mask to simultaneously form a contact connected to the contact region and a first electrode on the contact; forming a second insulation layer on the first insulation layer to cover the first protection layer pattern and the first electrode; planarizing the second insulation layer using the first protection layer pattern as a polishing stop layer until the first protection layer pattern is exposed; forming a second protection layer on the first protection layer pattern; forming an opening exposing the first electrode through the second protection layer and the first protection layer pattern; forming a phase-change material layer pattern on the first electrode to fill up the opening; and forming a second electrode on the phase-change material layer pattern and the second protection layer.