Method of forming tapered electrodes for electronic devices
First Claim
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1. A method of forming a film with a tapered edge in an electronic device, comprising:
- providing a substrate;
forming a first film on the substrate;
forming a second film on the first film, the first film having an etch rate that is different from an etch rate of the second film;
forming an etching mask on said second film; and
etching the first and second films using the etching mask to form a resultant film having a tapered edge.
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Abstract
In the method, a substrate is coated with different films to be patterned. These films have different etch rates. The films and substrate are then coated with a primary etch mask, and subsequently patterned to produce an electrode that has a gradual taper at the electrode edge. The formed electrode eliminates any abrupt substrate to electrode step, so that any subsequent thin-film deposition of piezoelectric material is continuous over the entire electrode surface and the electrode/substrate interface.
99 Citations
14 Claims
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1. A method of forming a film with a tapered edge in an electronic device, comprising:
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providing a substrate;
forming a first film on the substrate;
forming a second film on the first film, the first film having an etch rate that is different from an etch rate of the second film;
forming an etching mask on said second film; and
etching the first and second films using the etching mask to form a resultant film having a tapered edge. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method of forming a electronic device, comprising:
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(a) providing a substrate;
(b) forming a first film on the substrate;
(c) forming a second film on the first film, the first film having an etch rate that is different from an etch rate of the second film, the first and second films to be used to form a bottom electrode of the electronic device;
(d) forming an etching mask on said second film;
(e) etching the first and second films using the etching mask to form the electrode with a tapered edge;
(f) depositing a overlaying material on the formed electrode; and
(g) forming a top electrode on said overlaying material by repeating steps (a) to (e). - View Dependent Claims (9, 10, 11, 12, 13, 14)
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Specification