Manufacturing method for a micromechanical pressure sensor device and corresponding micromechanical pressure sensor device

Abstract

A manufacturing method for a micromechanical sensor device and a corresponding micromechanical sensor device. The method includes providing a substrate including at least one first through a fourth parallel trenches; depositing a layer onto the front side, the trenches being sealed, and structuring the layer, contact structures being formed in the layer above the second and fourth trenches; oxidizing of outwardly free-standing side surfaces of the contact structures as well as of the second and fourth trenches, at least in areas; depositing and structuring a first metallic contacting material, the contact structures being filled with the first metallic contacting material, at least in areas; opening the second trench and the fourth trench; galvanic deposition of a second metallic contacting material into the second and fourth trenches, resulting in the formation of a pressure-sensitive capacitive capacitor structure; and opening the first trench from the front side of the substrate.