Capacitive resonators and methods of fabrication
First Claim
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1. A method for fabricating micro-electro-mechanical system (MEMS) capacitive resonators, the method comprising:
- forming trenches in a semiconductor-on-insulator substrate;
conformally coating sidewalls of the trenches with an oxide;
filling the coated trenches with polysilicon, wherein electrodes are derived from the polysilicon;
forming release openings and removing the polysilicon and at least a portion of the semiconductor-on-silicon substrate; and
removing the conformally coated oxide and an oxide of the semiconductor-on-insulator substrate, wherein a capacitive gap is formed, wherein a resonating element of one of the capacitive resonators is released.
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Abstract
A micro-electro-mechanical system (MEMS) capacitive resonator and methods for manufacturing the same are invented and disclosed. In one embodiment, a method comprises forming trenches in a substrate, conformally coating the substrate with an oxide, filling the coated trenches with polysilicon, patterning the polysilicon, releasing a resonating structure derived from the substrate, and removing the conformally coated oxide.
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Citations
35 Claims
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1. A method for fabricating micro-electro-mechanical system (MEMS) capacitive resonators, the method comprising:
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forming trenches in a semiconductor-on-insulator substrate; conformally coating sidewalls of the trenches with an oxide; filling the coated trenches with polysilicon, wherein electrodes are derived from the polysilicon; forming release openings and removing the polysilicon and at least a portion of the semiconductor-on-silicon substrate; and removing the conformally coated oxide and an oxide of the semiconductor-on-insulator substrate, wherein a capacitive gap is formed, wherein a resonating element of one of the capacitive resonators is released. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A method for fabricating micro-electro-mechanical system (MEMS) capacitive resonators, the method comprising:
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forming trenches in a semiconductor-on-insulator substrate; conformally coating the sidewalls of the trenches with an oxide; filling the coated trenches with polysilicon, wherein electrodes are derived from the polysilicon; forming release openings and removing the polysilicon and at least a portion of the semiconductor-on-silicon substrate without isotropic etching of the polysilicon or semiconductor portion of the semiconductor-on-silicon substrate; and removing the conformally coated oxide and an oxide of the semiconductor-on-insulator substrate, wherein a capacitive gap is formed, wherein a resonating element of one of the capacitive resonators is released. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21, 22, 23, 24)
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25. A method for fabricating micro-electro-mechanical system (MEMS) capacitive resonators having sharply defined boundaries, the method consisting of:
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growing or depositing an oxide layer on a semiconductor-on-insulator substrate and patterning the oxide to the shape of the resonators; forming trenches in the semiconductor-on-insulator substrate by using the oxide layer as a mask; conformally coating sidewalls of the trenches with an oxide; filling the coated trenches with polysilicon, wherein electrodes are derived from the polysilicon; forming release openings and removing the polysilicon and at least a portion of the semiconductor-on-silicon substrate without isotropic etching of the polysilicon or semiconductor portion of the semiconductor-on-silicon substrate; and forming a resonating element having sharply defined boundaries of one of the capacitive resonators by removing the conformally coated oxide and an oxide of the semiconductor-on-insulator substrate, wherein a capacitive gap is formed, wherein the resonating element is released.
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26. A method for fabricating micro-electro-mechanical system (MEMS) capacitive resonators having a height-to-width ratio of less than one, the method comprising:
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forming trenches in a semiconductor-on-insulator substrate; conformally coating sidewalls of the trenches with an oxide; filling the coated trenches with polysilicon, wherein electrodes are derived from the polysilicon; forming release openings and removing the polysilicon and at least a portion of the semiconductor-on-silicon substrate without isotropic etching of the polysilicon or semiconductor portion of the semiconductor-on-silicon substrate; and forming a resonating element having a height-to-width ratio of less than one of the capacitive resonators by removing the conformally coated oxide and an oxide of the semiconductor-on-insulator substrate, wherein a capacitive gap is formed, wherein the resonating element is released. - View Dependent Claims (27, 28, 29, 30, 31, 32, 33, 34, 35)
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Specification