Abstract:
PURPOSE: A method and apparatus for manufacturing an air gap type FBAR using a polysilicon sacrificial layer and an etching stopper layer are provided to prevent problems due to a dry-etching using a plasma by perform the dry-etching without using the plasma. CONSTITUTION: An apparatus for manufacturing an air gap type FBAR(Film Bulk Acoustic Resonator) using a polysilicon sacrificial layer and an etching stopper layer includes a substrate having an etching stopper film(110) vaporized thereon, a polysilicon layer(120), the etching stopper layer(130a,130b), a membrane layer(130), and a laminated resonator. The polysilicon layer is vaporized on the etching stopper film and patterned to form a hollow portion(170). The etching stopper layer is vaporized on an interlayer between the hollow portion and the polysilicon. The membrane layer is vaporized on the polysilicon and the hollow portion. The laminated resonator is formed on the membrane layer.
Abstract:
The invention relates to a method of fabricating a micro machined channel, comprising the steps of providing a substrate of a first material and having a buried layer of a different material therein, and forming at least two trenches in said substrate by removing at least part of said substrate. Said trenches are provided at a distance from each other and at least partly extend substantially parallel to each other, as well as towards said buried layer. The method comprises the step of forming at least two filled trenches by providing a second material different from said first material and filling said at least two trenches with at least said second material; forming an elongated cavity in between said filled trenches by removing at least part of said substrate extending between said filled trenches; and forming an enclosed channel by providing a layer of material in said cavity and enclosing said cavity.
Abstract:
The present invention relates to a cantilever or membrane comprising a body and an elongated beam attached to the body. The elongated beam includes a first layer comprising a first material, a second layer comprising a second material having an elastic modulus different to that of the first material, a third layer comprising a third material having an elastic modulus different to that of the first material, where the first layer is sandwiched between the second layer and the third layer.
Abstract:
Etching islands are formed on a first face of a substrate and a second face of the substrate non-parallel to the first face. The first face and the second face of the substrate are concurrently exposed to a solution that reacts with the etching islands to concurrently form porous regions extending into the first face and the second face.
Abstract:
A microelectromechanical system (MEMS) microphone has a substrate including a backside trench, and a flexible membrane deposited on the substrate extending over the backside trench. The flexible membrane includes a first electrode. A silicon spacer layer is deposited on a perimeter portion of the flexible membrane. The spacer layer defines an acoustic chamber above the membrane and the backside trench. A silicon rich silicon nitride (SiN) backplate layer is deposited on top of the silicon spacer layer extending over the acoustic chamber. The backplate defines a plurality of opening into the acoustic chamber and includes a metallization that serves as a second electrode.
Abstract:
A method for manufacturing a multi-layer substrate structure such as a CSOI wafer structure (cavity-SOI, silicon-on-insulator) comprising obtaining a first and second wafer, such as two silicon wafers, wherein at least one of the wafers may be optionally provided with a material layer such as an oxide layer (302, 404), forming a cavity on the bond side of the first wafer (306, 406), depositing, preferably by ALD (Atomic Layer Deposition), a material layer, such as thin alumina layer, on either wafer arranged so as to at least in places face the other wafer and cover at least portion of the cavity of the first wafer, such as bottom, wall and/or edge thereof, and enable stopping etching, such as dry etching, into the underlying material (308, 408), and bonding the wafers provided with at least the aforesaid ALD layer as an intermediate layer together to form the multi-layer semi- conductor substrate structure (310, 312).A related multi-layer substrate structure is presented.
Abstract:
The invention relates to a method for producing a micromechanical component, the component produced using said method, and a use of the micromechanical component during the production of a micromechanical sensor component. In order to produce the micromechanical component, a first structured layer is first produced on the front side of a semiconductor wafer, and the semiconductor wafer is etched from the front side using a first trench etching step in accordance with said first structured layer. A second structured layer is then applied to the rear side of the semiconductor wafer, and the semiconductor wafer is etched from the rear side using a second trench etching step in accordance with the second structured layer. The invention is characterized in that a through-hole from the front side to the rear side is produced in the semiconductor wafer using the first and the second trench etching step.
Abstract:
The invention relates to a method for producing a micromechanical component comprising at least one self-supporting structure. According to said method a conductor track plane (11) and a sacrificial layer (4) consisting of an electrically non-conductive material are applied to a substrate (2) in such a way that the conductor track plane (11) lies between the substrate (2) and the sacrificial layer (4) or inside the sacrificial layer (4), and a layer (3) that forms the self-supporting structure is deposited on the sacrificial layer (4), the latter (4) being partially removed by etching in order to complete the self-supporting structure. An electrically conductive protective layer (15) is embedded in the sacrificial layer (4) above a region on the conductor plane (11) that is to be protected, said protective layer acting as an etching barrier during the etching process for the removal of the sacrificial layer (4). The protective layer (15) is removed again in a subsequent process, leaving a thin sacrificial layer (17) as a passivation layer lying below on the conductor tracks. The method permits sensitive areas of the conductor track plane to be protected and can be simply achieved with existing surface micromechanical processes.