Patent ID: 7807583
Filing Date: 2010-10-05
Classification: B81B,B81C,H01L

Abstract:
1. A method for etching a deep via in a substrate comprising the steps of: providing a substrate with at least one first layer on top of the substrate; depositing at least one first lithographic imaging layer on top of the first layer; forming a first pattern having a first diameter into the first lithographic imaging layer, wherein the first diameter is equal to a final aimed diameter of a deep via; transferring the first pattern into the first layer, whereby a patterned first layer having the first pattern is obtained; removing the first lithographic imaging layer; depositing at least one uniform polymer layer deposited on top of the patterned first layer, whereby the diameter of the first pattern is reduced to a second diameter smaller than the first diameter; etching the deep via in the substrate using the first pattern with the uniform polymer layer on top as a hard mask; and removing the first lithographic imaging layer and the uniform polymer layer.