Patent ID: 9242853
Filing Date: 2016-01-26
CPC Classification: B81B,B81C,H01L

Claim Text:
1. A method of forming getter material, comprising: providing a substrate into a processing chamber having one or more residual gases; forming one or more cavities located between bonding areas on a top surface of the substrate by selectively forming a hard mask on the top surface of the substrate to define the location of the one or more cavities, and selectively exposing the substrate to an etchant that removes parts of the substrate in areas not masked by the hard mask, wherein respective cavities have a roughened interior lower surface and roughened sidewall surfaces; and forming a getter layer configured to absorb the one or more residual gases within the one or more cavities by depositing the getter layer onto the hard mask and within the one or more cavities, and removing the hard mask and the getter layer from the bonding areas.