Patent ID: 8889538

Claim:
A method of forming a diode, comprising: forming a first electrode having an undulating topography, the undulating topography comprising a lowest surface and a highest surface; the highest surface being above the lowest surface by a distance, wherein the forming the first electrode comprises: etching an opening that extends through an insulative material and to an electrically conductive base; forming at least one sidewall spacer along sidewalls of the opening to narrow the opening, the base being exposed along a bottom of the narrowed opening; and dispersing seed material along the bottom of the narrowed opening, at least some of the seed material contacting the sidewall spacer; conformally depositing one or more layers across the undulating topography, the one or more layers together having a thickness that is less than or equal to about 10% of the distance; forming a second electrode over said one or more layers; and wherein the first electrode, one or more layers, and second electrode together form a diode.