Patent ID: 8790499

Claim:
A deposition ring for placement about a substrate support in a sputtering chamber, the substrate support comprising a substrate receiving surface having a plane and a peripheral wall that terminates before an overhanging edge of a substrate received on the substrate receiving surface, the deposition ring comprising: (a) an annular band surrounding the peripheral wall of the support, the annular band being composed of a material and having an exposed surface that is a roughened surface of the material,. the annular band comprising: (i) an inner lip extending transversely from the annular band, the inner lip being substantially parallel to the peripheral wall of the support and terminating below the overhanging edge of the substrate; (ii) a raised ridge that is substantially parallel to the plane of the receiving surface of the substrate support; (iii) an inner open channel between the inner lip and the raised ridge, the inner open channel extending at least partially below the overhanging edge of the substrate; and (iv) a ledge radially outward of the raised ridge.