Patent ID: 8353096

Claim:
A method of forming an array of transducers comprising the steps of: forming an array of transducers on a single semiconductor substrate, each of the transducers having a membrane configured to transducer between electrical and acoustic signals by motion of the membrane, the motion causing a distance between electrodes, separated by a gap, to change; and forming a plurality of walls with an insulator between respectively adjacent transducers, the plurality of walls leaving exposed the adjacent transducers formed on the substrate wherein the step of forming the plurality of walls includes the steps of: forming a plurality of first wall portions with the insulator between respectively adjacent transducers; forming an interconnect structure on at least some of the first wall portions; and forming a plurality of second wall portions with the insulator above the plurality of first wall portions, the first and second wall portions thereby creating the plurality of walls between respectively adjacent transducers, the plurality of walls leaving exposed the adjacent transducers formed on the substrate.