Method for forming vias in a dielectric film
First Claim
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1. A method for forming vias in a dielectric film, comprising:
- forming an electrode layer on a prepared substrate, said electrode layer being formed of an electrically conductive material having relatively low light energy absorption characteristics with respect to a laser beam;
depositing a dielectric layer on said electrode layer, said dielectric layer being formed of a material having a relatively high dielectric constant and relatively high light energy absorption characteristics with respect to said laser beam; and
ablating areas of said dielectric layer by directing said laser beam on said areas whereby said dielectric material is removed from said areas of the dielectric layer without adversely affecting the underlying electrode layer.
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Abstract
Vias are formed in a dielectric film overlying an electrode layer by sweeping a laser beam over the area in which the via is to be formed. In particular, a Nd:YAG laser, producing a beam of light having a 266 nm wave length, effectively ablates a barium strontium titanate dielectric film, without adversely affecting an underlying platinum electrode. The present invention overcomes the problem of wet chemical etching of dielectric films to form vias. Wet chemical etching often requires etchants that adversely affect the underlying metal electrode and typically require the use of environmentally undesirable chemicals.
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7 Claims
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1. A method for forming vias in a dielectric film, comprising:
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forming an electrode layer on a prepared substrate, said electrode layer being formed of an electrically conductive material having relatively low light energy absorption characteristics with respect to a laser beam; depositing a dielectric layer on said electrode layer, said dielectric layer being formed of a material having a relatively high dielectric constant and relatively high light energy absorption characteristics with respect to said laser beam; and ablating areas of said dielectric layer by directing said laser beam on said areas whereby said dielectric material is removed from said areas of the dielectric layer without adversely affecting the underlying electrode layer. - View Dependent Claims (2, 3, 4, 5)
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6. A method for forming vias in a dielectric film, comprising:
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forming an electrode layer on a prepared substrate, said electrode layer being formed of platinum; depositing a dielectric layer on said electrode layer, said dielectric layer being formed of barium strontium titanate; and ablating areas of said dielectric layer by directing a beam of light energy emitted from a quadrupled yttrium-aluminum-garnet laser on said areas whereby said barium strontium titanate is removed from the areas of the dielectric layer without adversely affecting the underlying platinum material in the electrode layer. - View Dependent Claims (7)
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Specification