Patent ID: 8168506
Filing Date: 2012-05-01
Classification: H01L

Abstract:
1. A method for forming a switching device, comprising: providing a substrate having a surface region; forming a first dielectric material overlying the surface region; forming a first structure comprising at least a bottom wiring structure and a switching element overlying the first dielectric material, the first structure comprising an exposed top surface region of the switching element; depositing a second dielectric material overlying at least the exposed top surface region of the switching element; forming a first opening region in a portion of the second dielectric material, the first opening region having a side region and a bottom region, the bottom region including the exposed top surface region of the switching element, the bottom region being characterized by a first area; depositing a third dielectric material conformably overlying at least the first opening region; subjecting the third dielectric material to an anisotropic etching process to form a second opening region, the anisotropic etching process removing a first portion of the third dielectric material to expose a first portion of the bottom region while a second portion of the third dielectric material remaining on the side region to form a sidewall structure overlying the side region of the first opening region, the first portion of the bottom region being characterized by a second area; depositing a conductive material overlying the first portion of the bottom region and the sidewall structure, the conductive material being in contact with the switching element, and forming a top wiring structure comprising at least the conductive material, wherein the switching device comprises the top wiring structure, the switching element, and the bottom wiring structure.