Semiconductor device with buried metallic region, and method for manufacturing the semiconductor device
First Claim
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1. A method for manufacturing an electronic device, comprising:
- forming a buried cavity in a semiconductor body;
forming an active region, including an electronic component, in the semiconductor body above the buried cavity;
forming a dielectric region, surrounding the active region, in the semiconductor body;
etching selective portions of the semiconductor body and the dielectric region to form one or more openings in fluidic connection with the buried cavity;
depositing metallic material within the buried cavity through the one or more openings, completely coating internal walls of the buried cavity and forming a metallic buried region, and completely coating internal walls of the one or more openings to form one or more paths for electrical access to the metallic buried region, wherein the semiconductor body includes a substrate and an epitaxial layer formed on the substrate, and forming the buried cavity includes;
etching selective portions of the substrate and forming a recess;
filling the recess with silicon germanium to form a sacrificial layer of silicon germanium;
growing an epitaxial layer on the substrate and on the sacrificial layer; and
removing completely the sacrificial layer through said one or more openings.
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Abstract
A semiconductor device includes: a semiconductor body including an active region that houses an electronic component and a passive dielectric region surrounding the active region; a conductive buried region, of metallic material or metallic alloy, which extends in the semiconductor body in the active region; and one or more electrical contacts, of metallic material, which extend between the conductive buried region and a top surface of the semiconductor body, and form respective paths for electrical access to the conductive buried region.
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Citations
14 Claims
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1. A method for manufacturing an electronic device, comprising:
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forming a buried cavity in a semiconductor body; forming an active region, including an electronic component, in the semiconductor body above the buried cavity; forming a dielectric region, surrounding the active region, in the semiconductor body; etching selective portions of the semiconductor body and the dielectric region to form one or more openings in fluidic connection with the buried cavity; depositing metallic material within the buried cavity through the one or more openings, completely coating internal walls of the buried cavity and forming a metallic buried region, and completely coating internal walls of the one or more openings to form one or more paths for electrical access to the metallic buried region, wherein the semiconductor body includes a substrate and an epitaxial layer formed on the substrate, and forming the buried cavity includes; etching selective portions of the substrate and forming a recess; filling the recess with silicon germanium to form a sacrificial layer of silicon germanium; growing an epitaxial layer on the substrate and on the sacrificial layer; and removing completely the sacrificial layer through said one or more openings. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method for manufacturing an electronic device, comprising:
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forming a buried cavity in a semiconductor body; forming an active region, including an electronic component, in the semiconductor body above the buried cavity; forming a dielectric region, surrounding the active region, in the semiconductor body, after forming the buried cavity; etching selective portions of the semiconductor body at the dielectric region after forming the buried cavity, the etching step forming one or more openings in fluidic connection with the buried cavity; depositing metallic material within the buried cavity through the one or more openings, completely coating internal walls of the buried cavity and forming a metallic buried region, and completely coating internal walls of the one or more openings to form one or more paths for electrical access to the metallic buried region, wherein the semiconductor body includes a substrate and an epitaxial layer formed on the substrate, and forming the buried cavity includes; etching selective portions of the substrate and forming a recess; filling the recess with silicon germanium to form a sacrificial layer of silicon germanium; growing an epitaxial layer on the substrate and on the sacrificial layer; and removing completely the sacrificial layer through, said one or more openings. - View Dependent Claims (8, 9, 10, 11)
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12. A method for manufacturing an electronic device, comprising:
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etching selective portions of a semiconductor substrate and forming a recess; filling the recess with silicon germanium to form a sacrificial layer of silicon germanium; growing an epitaxial layer on the substrate and on the sacrificial layer; forming an electronic component in the epitaxial layer and above the sacrificial layer; forming a dielectric region surrounding the active region and above the epitaxial layer and sacrificial layer; etching selective portions of the semiconductor body and the dielectric region, the etching step forming one or more openings in fluidic connection with the buried cavity; removing completely the sacrificial layer through said one or more openings, forming a buried cavity in the substrate; and depositing metallic material within the buried cavity through the one or more openings, completely coating internal walls of the buried cavity and forming a metallic buried region, and completely coating internal walls of the one or more openings to form one or more paths for electrical access to the conductive buried region. - View Dependent Claims (13, 14)
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Specification