Method for manufacturing integrated devices including electromechanical microstructures, without residual stress
First Claim
1. A method for manufacturing integrated devices including electromechanical microstructures, comprising the steps of forming a wafer of semiconductor material, including a substrate and an operative layer;
- forming an electromechanical microstructure in an area of said operative layer, and wherein before said step of forming a microstructure, the steps are carried out of forming a stress release trench, surrounding said area in said operative layer, and carrying out an annealing of said area including the stress release trench to release stress in the area.
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Abstract
On a substrate of semiconductor material, a sacrificial region is formed and an epitaxial layer is grown; a stress release trench is formed, surrounding an area of the epitaxial layer, where an integrated electromechanical microstructure is to be formed; the wafer is then heat treated, to release residual stress. Subsequently, the stress release trench is filled with a sealing region of dielectric material, and integrated components are formed. Finally, inside the area surrounded by the sealing region, a microstructure definition trench is formed, and the sacrificial region is removed, thus obtaining an integrated microstructure with zero residual stress.
24 Citations
10 Claims
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1. A method for manufacturing integrated devices including electromechanical microstructures, comprising the steps of forming a wafer of semiconductor material, including a substrate and an operative layer;
- forming an electromechanical microstructure in an area of said operative layer, and wherein before said step of forming a microstructure, the steps are carried out of forming a stress release trench, surrounding said area in said operative layer, and carrying out an annealing of said area including the stress release trench to release stress in the area.
- View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method for manufacturing integrated devices including electromechanical microstructures, comprising:
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forming a wafer of semiconductor material, including a substrate and an epitaxial layer, comprising;
forming a sacrificial region on the substrate;
growing a pseudoepitaxial layer, the pseudoepitaxial layer comprising at least one monocrystalline region above the substrate and one polycrystalline region above the sacrificial region;
forming a stress release trench surrounding an area in the epitaxial layer and carrying out heat treatment of the area;
forming electronic components in the monocrystalline region of the pseudoepitaxial layer; and
forming an electromechanical microstructure in the area of the epitaxial layer, comprising excavating a structure definition trench inside the polycrystalline region and removing the sacrificial region.
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Specification