Patent ID: 6951775

Claim:
A method of forming a semiconductor interconnect comprising, in the order recited: (a) providing a semiconductor wafer; (b) forming bonding pads in a terminal wiring level on the frontside of said wafer; (c) reducing the thickness of said wafer to produce a reduced thickness wafer; (d) providing an evaporation fixture comprising a bottom ring, a shim, an evaporation mask and a top ring; (e) placing said shim into said bottom ring; (f) placing said reduced thickness wafer on said shim; (g) placing on and aligning said mask to said reduced thickness wafer, (h) placing said top ring over said mask and temporarily fastening said top ring to said bottom ring; (i) evaporating solder bumps on said bonding pads through said mask; (h) removing said reduced thickness wafer from said fixture; and (j) dicing said reduced thickness wafer into bumped semiconductor chips.