A simple testing method is presented that allows the comparison of the
bond quality for anodically bonded wafers, An array of parallel metal
lines of predetermined thickness is formed on a glass wafer. The esti
mation of the bond quality can be performed by visual inspection after
the bonding. This method enables comparison of the anodic-bonding pro
cess performance for different glasses, for intermediate layers and va
rious bonding conditions. The optimization of silicon-glass anodic bon
ding with an intermediate phosphosilicate glass (PSG) layer is shown u
sing this technique.