Methods for reducing the curvature in boron-doped silicon micromachined structures
First Claim
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1. A wafer comprising:
- a substrate layer having a top surface and a bottom surface, and a thickness;
a top boron-doped silicon layer having a thickness and positioned adjacent to the top surface of the substrate layer; and
a bottom boron-doped silicon layer having a thickness and positioned adjacent to the bottom surface of the substrate layer; and
wherein the thickness of the substrate layer is at least and order of magnitude greater than the thickness of the top or bottom boron-doped silicon layer.
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Abstract
Layers of boron-doped silicon having reduced out-of-plane curvature are disclosed. The layers have substantially equal concentrations of boron near the top and bottom surfaces. Since the opposing concentrations are substantially equal, the compressive stresses on the layers are substantially balanced, thereby resulting in layers with reduced out-of-plane curvature.
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6 Claims
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1. A wafer comprising:
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a substrate layer having a top surface and a bottom surface, and a thickness;
a top boron-doped silicon layer having a thickness and positioned adjacent to the top surface of the substrate layer; and
a bottom boron-doped silicon layer having a thickness and positioned adjacent to the bottom surface of the substrate layer; and
wherein the thickness of the substrate layer is at least and order of magnitude greater than the thickness of the top or bottom boron-doped silicon layer. - View Dependent Claims (2)
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3. A substantially planar layer, comprising:
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a boron-doped silicon layer having first and second opposing surfaces; and
a substantially symmetrical boron doping profile between the first and second opposing surfaces of the boron-doped silicon layer. - View Dependent Claims (4, 5, 6)
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Specification