Method of stress relaxation in an antireflective coated cap wafer of infrared focal plane array wafer level packaged

摘要

Methods for reducing wafer bow induced by an anti -reflective coating of a cap wafer are provided. The method may utilize a shadow mask having at least one opening therein that is positioned opposite recessed regions in a cap wafer. The method may further include depositing at least one layer of an anti-reflective coating material through the shadow mask onto a planar side of a cap wafer to provide a discontinuous coating on the planar side.