Abstract:
A method and system for providing a MEMS device with a portion exposed to an outside environment are disclosed. The method comprises bonding a handle wafer to a device wafer to form a MEMS substrate with a dielectric layer disposed between the handle and device wafers. The method includes lithographically defining at least one standoff on the device wafer and bonding the at least one standoff to an integrated circuit substrate to form a sealed cavity between the MEMS substrate and the integrated circuit substrate. The method includes defining at least one opening in the handle wafer, standoff, or integrated circuit substrate to expose a portion of the to expose a portion of the device wafer to the outside environment.
Abstract:
A MEMS device includes a dual membrane (12,14), an electrode (24), and an interconnecting structure (26). The dual membrane has a top membrane (12) and a bottom membrane (14). The bottom membrane is positioned between the top membrane and the electrode and the interconnecting structure defines a spacing between the top membrane and the bottom membrane.
Abstract:
The invention discloses a capacitive pressure sensor and a method of fabricating the same. The capacitive pressure sensor includes a fixed plate configured as a back plate, a movable plate configured as diaphragm for sensing pressure, wherein a cavity is formed between the fixed plate and the movable plate, an isolation layer between the fixed plate and the movable plate and electrical contacts thereof for minimizing the leakage current, plurality of damping holes for configuring the contour of the fixed plate as the deflected diaphragm when pressure is exerted, a vent hole extending to the cavity having resistive air path for providing equilibrium to the diaphragm and an extended back chamber for increasing the sensitivity of the capacitive pressure sensor. The capacitive pressure sensor is also configured for minimizing parasitic capacitance.
Abstract:
The semiconductor device comprises a substrate (1) of semiconductor material, at least one integrated component (2) in the substrate at or near a main surface (1'), a plurality of electric conductors (3) at or above the main surface, the integrated component being electrically connected with the electric conductors, a capacitor electrode (11) and at least one further capacitor electrode (12) arranged at or above the opposite back surface (1'') of the substrate, and through-substrate vias (8) with metallizations (9). Each of the metallizations (9) connects one of the electric conductors (3) with either the capacitor electrode (11) or the further capacitor electrode (12). At least one coupling electrode (15) is arranged in the vicinity of the capacitor electrode (11) and the further capacitor electrode (12).
Abstract:
The invention relates to a method for producing a semiconductor structure comprising a buried cavity (64), wherein a first semiconductor substrate (10) having an upper face (22) is provided and a depression is formed in the upper face (22) of the first semiconductor substrate (10). In addition, a second semiconductor substrate (26) having crystal lattice planes and an upper face (28) is provided, said upper face extending substantially parallel to the crystal lattice planes, and one of the crystal lattice planes, which is located at a desired distance from the upper face (28) of the second semiconductor substrate (26), is weakened by means of ion implantation such as to generate a predetermined breaking plane. The upper face (28) of the second semiconductor substrate (26) is bonded to the upper face (22) of the first semiconductor substrate (10) under vacuum conditions, wherein the second semiconductor substrate (26) covers the depression (20) in the upper face (22) of the first semiconductor substrate (10) in order to form a buried cavity (60). The second semiconductor substrate (26) is split along the predetermined breaking plane, which leaves a membrane layer (34) of the upper face (22) of the first semiconductor substrate (10).
Abstract:
La présente invention concerne un dispositif résonant à détection dans le plan piézorésistive réalisé en technologies de surfaces sur un substrat, qui comprend un résonateur (10) relié à ce substrat par au moins un encastrement (12), des moyens d'excitation (14) de ce résonateur et des moyens de détection comprenant au moins une jauge de contrainte de type poutre suspendue réalisée en matériau piézorésistif (11), dans lequel chaque jauge de contrainte a un plan commun avec le résonateur, et est relié à ce résonateur (10) en un point situé en dehors de cet au moins un encastrement (12) pour augmenter 1a contrainte vue par cette jauge de contrainte.
Abstract:
System and methods for silicon on insulator MEMS pressure sensors are provided. In one embodiment, a method comprises: applying a doping source to a silicon-on-insulator (SOI) silicon wafer having a sensor layer and an insulating layer comprising SiO 2 material; doping the silicon wafer with Boron atoms from the doping source while controlling an injection energy of the doping to achieve a top-heavy ion penetration profile; and applying a heat source to diffuse the Boron atoms throughout the sensor layer of the SOI silicon wafer.