Abstract:
L'invention se rapporte à un procédé pour réaliser au moins une cavité d'air dans une microstructure, qui comprend : 1) la fourniture d'une microstructure comprenant au moins une cavité remplie d'un matériau sacrificiel qui se décompose à partir d'une température θ 1 , cette cavité étant délimitée sur au moins une partie de sa surface par une membrane non poreuse, constituée d'un matériau formant une matrice et d'un agent porogène qui se décompose à une température θ 2 1 d'au moins 20°C et qui est dispersé dans cette matrice ; 2) le traitement de la microstructure à une température ≥ à θ 2 mais 1 pour décomposer sélectivement l'agent porogène ; puis 3) le traitement de la microstructure à une température ≥ à θ 1 pour décomposer le matériau sacrificiel. Applications : fabrication de structures d'interconnexions à cavités d'air pour circuit intégré et de toute autre microstructure dans les industries microélectronique et microtechnologique.
Abstract:
According to one embodiment, a movable MEMS component suspended over a substrate is provided. The component can include a structural layer having a movable electrode separated from a substrate by a gap. The component can also include at least one standoff bump attached to the structural layer and extending into the gap for preventing contact of the movable electrode with conductive material when the component moves. The structural layer is folded.
Abstract:
Trilayered Beam MEMS Device and Related Methods. According to one embodiment, a method for fabricating a trilayered beam is provided. The method can include depositing a sacrificial layer on a substrate and depositing a first conductive layer on the sacrificial layer. The method can also include forming a first conductive microstructure by removing a portion of the first conductive layer. Furthermore, the method can include depositing a structural layer on the first conductive microstructure, the sacrificial layer, and the substrate and forming a via through the structural layer to the first conductive microstructure. Still furthermore, the method can include the following: depositing a second conductive layer on the structural layer and in the via; forming a second conductive microstructure by removing a portion of the second conductive layer, wherein the second conductive microstructure electrically communicates with the first conductive microstructure through the via; and removing a sufficient amount of the sacrificial layer so as to separate the first conductive microstructure from the substrate, wherein the structural layer is supported by the substrate at a first end and is freely suspended above the substrate at an opposing second end.
Abstract:
An epitaxial layer (3, 5) is deposited on a substrate (1) with adjacently grown mono- and poly-crystalline silicon. A region (5, 6) is exposed as a vertically displaceable polycrystalline membrane, in particular for a pressure sensor, by means of etching. The poly/mono transition regions to both sides of the membrane each have an inclined profile such that the mono-crystalline silicon extends over the polycrystalline silicon in the form of a overhang (6) in the membrane region (5, 6). Piezoelements (10) are implanted in the overhang (6).
Abstract:
According to one embodiment, a movable MEMS component (100) suspended over a substrate (102) is provided. The component (100) can include a structural layer (112) having a movable electrode (114) separated from a substrate (102) by a gap. The component (100) can also include at least one standoff bump (118) attached to the structural layer (112) and extending into the gap for preventing contact of the movable electrode (114) with conductive material when the component moves.
Abstract:
The present invention relates to a fabrication process for manufacture of micro electromechanical (MEM) devices such as cantilever support beams. This fabrication process requires only two lithographic masking steps and offers moveable electromechanical devices with high electrical isolation. A preferred embodiment of the process uses electrically insulating glass substrate (102) as the carrier substrate and single crystal silicon (108) as the MEM component material. The process further includes deposition of an optional layer of insulating material (110) such as silicon dioxide on top of a layer of doped silicon (108) grown on a silicon substrate. The silicon dioxide (110) is epoxy bonded to the glass substrate (102) to create a silicon-silicon dioxide-epoxy-glass structure (200). The silicon is patterned using anisotropic plasma dry etching techniques. A second patterning then follows to pattern the silicon dioxide layer (110) and an oxygen plasma etch is performed to undercut the epoxy film (120) and to release the silicon MEM component. This two-mask process provides single crystal silicon MEMs with electrically isolated MEM component. Retaining silicon dioxide insulating material (110) in selected areas mechanically supports the MEM component.
Abstract:
A semiconductor package that contains an application-specific integrated circuit (ASIC) die and a micro-electromechanical system (MEMS) die. The MEMS die and the ASIC die are coupled to a substrate that includes an opening that extends through the substrate and is in fluid communication with an air cavity positioned between and separating the MEMS die from the substrate. The opening exposes the air cavity to an external environment and, following this, the air cavity exposes a MEMS element of the MEMS die to the external environment. The air cavity separating the MEMS die from the substrate is formed with a method of manufacturing that utilizes a thermally decomposable die attach material.
Abstract:
A method for manufacturing a film support beam includes: providing a substrate having opposed first and second surfaces; coating a sacrificial layer on the first surface of the substrate, and patterning the sacrificial layer; depositing a dielectric film on the sacrificial layer to form a dielectric film layer, and depositing a metal film on the dielectric film layer to form a metal film layer; patterning the metal film layer, and dividing a patterned area of the metal film layer into a metal film pattern of a support beam portion and a metal film pattern of a non-support beam portion, wherein a width of the metal film pattern of the support beam portion is greater than a width of a final support beam pattern, and a width of the metal film pattern of the non-support beam portion is equal to a width of a width of a final non-support beam pattern at the moment; photoetching and etching on the metal film layer and the dielectric film layer to obtain the final support beam pattern, the final non-support beam pattern and a final dielectric film layer, wherein the final dielectric film layer serves as a support film of the final support beam pattern and the final non-support beam pattern; and removing the sacrificial layer.
Abstract:
In described examples, a MEMS device is formed by forming a sacrificial layer over a substrate and forming a first metal layer over the sacrificial layer. Subsequently, the first metal layer is exposed to an oxidizing ambient which oxidizes a surface layer of the first metal layer where exposed to the oxidizing ambient, to form a native oxide layer of the first metal layer. A second metal layer is subsequently formed over the native oxide layer of the first metal layer. The sacrificial layer is subsequently removed, forming a released metal structure.