Patent ID: 8039950

Claim:
A cover wafer with a core ( 1 ) and an inside ( 7 , 10 , 11 ), the inside comprising one or more of: (an) annular outer region(s) ( 7 ), (an) annular region(s) ( 10 ) which adjoin(s) the outer region(s) to the inside, and (an) inner region(s) ( 11 ), wherein at least the annular region(s) ( 10 ) comprise(s) a buffer layer which has a wetting angle of <35° for a metallic eutectic which melts in the range of between 265° C. and 450° C., characterized in that a solder material ( 2 ; 5 ) is continuously present on the annular outer regions which forms a gold silicon eutectic upon bonding the cover wafer with a wafer substrate ( 3 ).