Therefore, the variations derived for the PECVD part of the oxide deposition shown in this work need to be complemented by the SACVD variations. Theoretically, the dependence on the waferposition could become more or less pronounced, depending on the influence of the wafer position in the SACVD process. In additionto the variations due to the deposition processes themselves, variations of the etching profile across the wafer can have an impact on the layer profiles and on the performance of the TSVs.