Patent ID: 9627613
Date: 2017-04-18
CPC Classifications: H01L

Claim:
1. A resistive random access memory (RRAM) cell comprising: a bottom electrode layer; a tantalum oxide based layer arranged over the bottom electrode layer; a composite capping layer arranged over and abutting the tantalum oxide based layer, wherein the composite capping layer includes a first metal layer and a second metal layer overlying the first metal layer, wherein the first and second metal layers are elemental metals configured to store oxygen from the tantalum oxide based layer, and wherein the first metal layer is more reactive with the tantalum oxide based layer than the second metal layer; and a top electrode layer arranged over the composite capping layer, wherein the top electrode layer and the composite capping layer share a first width, and wherein the tantalum oxide based layer and the bottom electrode layer share a second width greater than the first width.