METHOD OF IMPROVING CORROSION-RESISTANT PROPERTIES OF ALUMINUM CONTACT ON SEMICONDUCTOR

摘要

PURPOSE: To make exposed aluminum contained in a contact pad more incorrodible by electrically fixing a lead frame to the contact pad containing the aluminum and applying a sufficient amount of zinc chromate solution to the contact pad for a sufficiently long time at a sufficiently high temperature. CONSTITUTION: When a semiconductor product is manufactured, a semiconductor device provided with a contact pad containing aluminum is prepared and the corrosion resistance of the aluminum contained in the contact pad is substantially improved against the atmosphere containing moisture and ions by applying a sufficient amount of zinc chromate solution top the contact pad for a sufficiently long time at a sufficiently high temperature. The zinc chromate solution can be an aqueous solution containing zinc chromate by about 0.1% to about 20% of the total weight of the component of the solution or a saturated zinc chromate solution and the application of the solution is executed for about 10 minutes to about 60 minutes while the temperature of the solution is maintained between about 50 deg.C and about 100 deg.C.