Abstract: A solar cell module layer stack is described. The layer stack includes a doped silicon wafer substrate, a further layer of the substrate or deposited on the substrate, wherein the further layer is doped for generation of a p-n-junction with the doped silicon wafer substrate; and a first sputtered passivation layer deposited on the doped silicon wafer substrate or the further layer, wherein the passivation layer is selected from the group consisting of: an aluminum-containing oxide layer, an aluminum-containing oxynitride layer, and mixtures thereof; and wherein the passivation layer being plasma treated under a hydrogen-containing atmosphere and/or wherein the layer stack further comprises a hydrogen-containing cap layer on the passivation layer.

Abstract: A magnetron sputtering apparatus has a controller for selectively releasing the spread of plasma on a substrate on a support. The controller can also contain the plasma when the substrate is to be coated with the target material. This enables cleaning of the target surface during intervals between deposition of target material onto a desired substrate, such as a wafer, and ensures that layers or flakes of back-scattered deposited target material do not build up on the target itself. A platen coil is located between the magnetron and the support to increase both uniformity and density of target material arriving nearly normal to the substrate surface.