Patent ID: 9412790
Filing Date: 2016-08-09
CPC Classification: H01L

Claim Text:
1. A method for forming a resistive switching device for a non-volatile memory device, comprising: providing a substrate having a surface region; forming a first dielectric layer overlying the surface region of the substrate; forming a first wiring structure comprising a first wiring material overlying the first dielectric layer; depositing a first junction material layer comprising a p+ polycrystalline silicon germanium containing material overlying at least the first wiring structure; depositing a hardmask material layer overlying the first junction material layer; subjecting the hardmask material layer and the first junction material layer to a first patterning and etching process to form one or more first structures overlying a surface region of the first wiring structure; forming a second dielectric layer to fill a gap region between the one or more first structures; forming a resistive switching material layer overlying the one or more first structures that comprises SiOx; depositing an active conductive material layer overlying the resistive switching material layer, wherein the resistive switching material layer is at least in part permeable to particles of the active conductive material layer that, in response to an electric field, facilitate formation of a conductive path through the resistive switching material layer; forming a second structure, overlying a first structure of the one or more first structures, from the resistive switching material layer and the active conductive material layer with one or more second patterning processes, wherein a first width of any two opposite first vertical sidewalls of the resistive switching material layer in the second structure is greater than a second width of any two opposite second vertical sidewalls of the first structure.