Method for forming an ultrasonic transducer, and associated apparatus
Dausch, D., & Goodwin, S. (2014). Method for forming an ultrasonic transducer, and associated apparatus. (U.S. Patent No. 8692441). http://patft.uspto.gov/netacgi/nph-Parser?patentnumber=8692441
Abstract
A method is provided for forming a piezoelectric ultrasonic transducer apparatus having a first electrode deposited on a dielectric layer disposed on a primary substrate. A piezoelectric material is deposited between the first electrode and a second electrode, to form a transducer device. At least the piezoelectric material is patterned such that a portion of the first electrode extends laterally outward therefrom. The primary substrate and the dielectric layer are etched to form a first via extending to the laterally outward portion of the first electrode, and a first conductive material is deposited to substantially fill the first via and form an electrically-conductive engagement with the laterally outward portion of the first electrode. The primary substrate is etched to define a second via extending therethrough, wherein the second via is laterally spaced apart from the first via. An associated method and apparatus are also provided.
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