Patent ID: 8247312

Claim:
A method of coating a silicon wafer with an ink, the silicon wafer including a surface with a set of non-rounded peaks and a set of non-rounded valleys, wherein each non-rounded peak of the set of non-rounded peaks includes a first apex surface area, wherein each non-rounded valley of the set of non-rounded valleys is defined between two proximally located non-rounded peaks, and wherein each non-rounded valley further includes a first valley surface area, comprising, adding an etch mask to the surface of the silicon wafer with the set of non-rounded peaks and the set of non-rounded valleys, exposing the silicon wafer including at least some of the non-rounded peaks and at least some of the non-rounded valleys in a region to an etchant while the non-rounded peaks and the non-rounded valleys outside the region is not exposed to the etchant, wherein a set of rounded peaks and a set of rounded valleys are formed in the region, each rounded peak of the set of rounded peaks having a second apex surface area smaller than the first apex surface area, each rounded valley of the set of the rounded valleys having a second valley surface area smaller than the first valley surface area, thereby obtaining the silicon wafer including the rounded peaks and the rounded valleys in the region and the non-rounded peaks and the non-rounded valleys outside the region; and, depositing the ink on the region.