Patent ID: 6902872

Claim:
A method of manufacturing a fluidic ejection device, wherein the fluidic ejection device includes a substrate having a frontside and a backside, the method comprising: forming a circuit element on the frontside of the substrate, wherein the circuit element is formed from a plurality of layers deposited on the frontside of the substrate, the plurality of layers including an intermediate electrical contact layer; and forming an interconnect structure extending into the backside of the substrate after forming the electrical contact layer, wherein the interconnect structure includes a contact pad formed on the substrate backside and a through-substrate interconnect in electrical communication with the contact pad, wherein the through-substrate interconnect includes a trench formed from the wafer backside to the electrical contact layer, wherein the trench is substantially full with an electrically conductive material, and wherein the through-substrate interconnect extends through the substrate to the electrical contact layer.