Patent ID: 7005379

Claim:
A semiconductor processing method for forming an electrical contact, comprising: providing a semiconductor substrate which supports an electrically insulative material and a pair of electrical nodes, the electrical nodes being a first node and a second node, a first opening extending through the electrically insulative material to the first node and a second opening extending through the electrically insulative material to the second node, the first node being at a first elevational height over the substrate and the second node being at a second elevational height over the substrate, the first elevational height being less than the second elevational height and accordingly the-first opening being deeper than the second opening, the first electrical node having a first surface exposed within the first opening and the second electrical node having a second surface exposed within the second opening, the first surface being suitable for electroless plating and the second surface not being suitable for electroless plating; electroless plating a first conductive material within the first opening and from the first surface to form a first conductive material plug extending to a height within the first opening that is about the same as the second elevational height; activating the second surface to render the second surface suitable for electroless plating; and after activating the second surface, electroless plating a second conductive material within the first and second openings, the second conductive material within the first opening forming a second conductive material plug extending upwardly from the first conductive material plug, and the second material within the second opening forming a second. conductive material plug extending upwardly from the second surface.