Methods of manufacture MEMS devices
First Claim
1. A method of forming a micro-electromechanical system (MEMS) device, the method comprising:
- forming a buried oxide layer over a substrate;
forming a first semiconductive material over the buried oxide layer;
forming at least one trench in the first semiconductive material and the buried oxide layer, the at least one trench comprising a first sidewall and a second sidewall opposite the first sidewall;
forming an insulating material layer over at least a portion of the first sidewall of the at least one trench, wherein the insulating material layer is not an air gap;
forming a second semiconductive material within the at least one trench; and
forming a first gap in an upper portion of the at least one trench, the first gap being formed between the second semiconductive material and the second sidewall of the at least one trench in the first semiconductive material.
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Accused Products
Abstract
Micro-electromechanical system (MEMS) devices and methods of manufacture thereof are disclosed. In one embodiment, a MEMS device includes a first semiconductive material and at least one trench disposed in the first semiconductive material, the at least one trench having a sidewall. An insulating material layer is disposed over an upper portion of the sidewall of the at least one trench in the first semiconductive material and over a portion of a top surface of the first semiconductive material proximate the sidewall. A second semiconductive material or a conductive material is disposed within the at least one trench and at least over the insulating material layer disposed over the portion of the top surface of the first semiconductive material proximate the sidewall.
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Citations
22 Claims
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1. A method of forming a micro-electromechanical system (MEMS) device, the method comprising:
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forming a buried oxide layer over a substrate; forming a first semiconductive material over the buried oxide layer; forming at least one trench in the first semiconductive material and the buried oxide layer, the at least one trench comprising a first sidewall and a second sidewall opposite the first sidewall; forming an insulating material layer over at least a portion of the first sidewall of the at least one trench, wherein the insulating material layer is not an air gap; forming a second semiconductive material within the at least one trench; and forming a first gap in an upper portion of the at least one trench, the first gap being formed between the second semiconductive material and the second sidewall of the at least one trench in the first semiconductive material. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method of fabricating a micro-electromechanical system (MEMS) device, the method comprising:
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forming a oxide layer over a workpiece; forming a first semiconductive material over the oxide layer; forming a first trench in the first semiconductive material and the oxide layer, the trench comprising a first sidewall and a second sidewall opposite the first sidewall; forming an insulating material layer over the first semiconductive material, a first portion of the insulating material layer being formed over at least a portion of the first sidewall of the first trench, wherein the insulating material layer comprises an oxide or a nitride material; forming a semiconductive material or conductive material within the first trench, the semiconductive material or conductive material contacting the first portion of the insulating material layer; and forming a first gap in an upper portion of the first trench, the first gap being formed between the semiconductive material or conductive material and the second sidewall of the first trench. - View Dependent Claims (8, 9, 10, 11, 12, 13, 14, 20)
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15. A method of manufacturing a micro-electromechanical system (MEMS) device, the method comprising:
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providing a workpiece, the workpiece comprising a substrate, a buried oxide layer disposed over the substrate, and a first semiconductive material disposed over the buried oxide layer, the first semiconductive material having a top surface; forming at least one trench in the first semiconductive material, the at least one trench comprising a first sidewall and a second sidewall opposite the first sidewall; forming an insulating material layer over the first and second sidewalls of the at least one trench, and the top surface of the buried oxide layer; disposing a second semiconductive material or a conductive material over the insulating material layer; removing portions of the second semiconductive material or the conductive material thereby leaving the second semiconductive material or the conductive material within the at least one trench; and removing the insulating material layer from over the second sidewall of the at least one trench. - View Dependent Claims (16, 17, 18, 19, 21, 22)
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Specification