Patent ID: 7509875
Filing Date: 2009-03-31
Classification: G01R,H01L

Abstract:
1. A process for the non-destructive examination as a measurement or monitoring of the strength of bonded wafer connections, in which an area with a defined height deviation is formed as a raised or depressed structure ( 3 ) with respect to the surface level of the first wafer ( 1 ) provided with an intermediate insulator layer on the one wafer ( 1 ), wherein electrical read-out contacts ( 5 ) are generated in the surroundings of the structure ( 3 ) deviating from the surface level at defined distances from the edge of the structure ( 3 ) on the intermediate insulator layer ( 2 ) of the one wafer ( 1 ) with supply lines and evaluation connections ( 7 ) and a feed contact ( 4 ) with a supply connection ( 6 ) and a connection path ( 10 ) is formed on the second wafer ( 8 ) in an area which overlaps the area of the read-out contacts ( 5 ), which, after the bonding, forms an electrical contact with the feed contact ( 4 ) to the supply connection ( 6 ), wherein, after the bonding, an unbonded area ( 9 ) is formed as a hollow space in the surroundings of the raised or depressed structure ( 3 ) and the plane extension of the unbonded area ( 9 ) is determined as a measure of the strength of the bonding connection by means of a contact current measurement from the supply connection ( 6 ) to the evaluation connections.