Patent ID: 7473577
Filing Date: 2009-01-06
Classification: H01L

Abstract:
1. A method of fabricating a compliant through via in a silicon carrier, the method comprising: patterning the silicon carrier; etching an annulus into the silicon carrier using deep reactive ion etching processes; insulating the annulus using a thermally grown oxide; filling the annulus with a compliant material; patterning the silicon; performing a reactive ion etch to remove the oxide and a deep reactive ion etching to remove a silicon center post; re-patterning the silicon to form a through hole in the silicon; copper plating the silicon to form a via collar; postgrinding a backside of the silicon carrier to expose a copper post; patterning the backside of the carrier and plating the carrier to form a copper pad and ball limiting metallurgy; and fabricating solder bumps onto the ball limiting metallurgy using a transfer method.