Polarity determining seed layer and method of fabricating piezoelectric materials with specific C-axis
First Claim
1. An acoustic resonator, comprising:
- a substrate having a first side and a second side;
a first electrode disposed over the first side of the substrate;
a second electrode;
a piezoelectric layer comprising aluminum nitride (AlN) disposed between the first electrode and the second electrode, and comprising a C-axis having an orientation; and
a polarization-determining seed layer (PDSL) disposed over the first side of the substrate, and beneath the piezoelectric layer, the PDSL comprising gallium nitride (GaN), wherein neither AlN nor GaN are disposed on the second side of the substrate.
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Accused Products
Abstract
An acoustic resonator comprises a first electrode, a second electrode and a piezoelectric layer disposed between the first electrode and the second electrode, and comprising a C-axis having an orientation. A polarization-determining seed layer (PDSL) is disposed beneath the piezoelectric layer, the seed layer comprising a metal-nonmetal compound. A method of fabricating a piezoelectric layer over a substrate comprises forming a first layer of a polarization determining seed layer (PDSL) over the substrate. The method further comprises forming a second layer of the PDSL over the first layer. The method further comprises forming a first layer of a piezoelectric material over the second layer of the PDSL; and forming a second layer of the piezoelectric material over the first layer of the piezoelectric material. The piezoelectric material comprises a compression axis (C-axis) oriented along a first direction.
20 Citations
7 Claims
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1. An acoustic resonator, comprising:
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a substrate having a first side and a second side; a first electrode disposed over the first side of the substrate; a second electrode; a piezoelectric layer comprising aluminum nitride (AlN) disposed between the first electrode and the second electrode, and comprising a C-axis having an orientation; and a polarization-determining seed layer (PDSL) disposed over the first side of the substrate, and beneath the piezoelectric layer, the PDSL comprising gallium nitride (GaN), wherein neither AlN nor GaN are disposed on the second side of the substrate. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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Specification