Abstract:
Die Erfindung betrifft einen mikromechanischen Sensor und eine Verfahren zu seiner Herstellung. Erfindungsgemäß wird eine sichere Membraneinspannung unabhängig von prozesstechnisch bedingten Schwankungen des Kavernenätzprozesses und eine freie Gestaltung der Membranform ermöglicht, indem eine geeignete Anbindung der Membran in einer durch lokale Oxidation erzeugten Oxidschicht ausgebildet wird. Der mikromechanischer Sensor weist mindestens auf: ein Substrat (1), eine in einem lateral äußeren Bereich (4) in dem Substrat (1) ausgebildete äußere Oxidschicht (9), eine in einem lateral inneren Membranbereich (5) ausgebildete Membran (15) mit mehreren Perforationslöchern (16), eine in das Substrat (1) unterhalb der Membran (15) geätzte Kaverne (14), wobei die Membran (15) in einem Aufhängungsbereich (10) der äußeren Oxidschicht (9) aufgehängt ist, der sich zu Anbindungspunkten (12) der Membran (15) hin verjüngt, und die Membran (15) in ihrer vertikalen Höhe zwischen einer Oberseite (17) und einer Unterseite (19) der äußeren Oxidschicht (9) angeordnet ist.
Abstract:
The invention relates to a method for manufacturing a micromechanical part made of reinforced silicon, comprising the steps of: micromachining the part, or a batch of parts, in a silicon wafer; forming, in one or more steps and over the entire surface of the part, a layer of silicon dioxide, so as to obtain a thickness of silicon dioxide that is at least five times greater than the thickness of native silicon dioxide; and removing the layer of silicon dioxide by chemical attack.
Abstract:
Le procédé de fabrication d'une pièce micromécanique en silicium renforcé comporte les étapes de : - micro-usiner la pièce, ou un lot de pièces dans une plaquette de silicium ; - former, sur toute la surface de la pièce, en une ou plusieurs étapes, une couche de dioxyde de silicium, de manière à obtenir une épaisseur de dioxyde de silicium au moins cinq fois supérieure à l'épaisseur d'un dioxyde de silicium natif ; - retirer la couche de dioxyde de silicium par attaque chimique.
Abstract:
The invention relates to a simple and cost-effective method for producing optically transparent regions (5, 6) in a silicon substrate (1) with which the optically transparent regions can be realized with any thickness and can be provided above a cavity located in the silicon substrate. To this end, at least one defined region (5, 6) of the silicon substrate (1) is firstly etched whereby rendering it porous. Afterwards, the defined porous region (5, 6) of the silicon substrate (1) is oxidized.
Abstract:
Method of forming a diaphragm (11) supported in a cavity (22), comprising the steps of:
a. implant in a substrate (8) a p-type layer (50); b. deposit an n-type epitaxial layer (18) on the substrate (8); c. implant spaced sinkers (58) through the epitaxial layer (18) and into electrical connection with the layer (50); d. anodize the substrate (8) to form porous silicon of the sinkers (58) and said layer (50); e. oxidize the porous silicon to form silicon dioxide ; and f. etch the silicon dioxide to form the cavity (22) and diaphragm (11). A direct etching of porous silicon is also proposed.
Abstract:
The invention concerns a micromechanical sensor and a method for the production thereof. According to the invention, the diaphragm can be reliably mounted regardless of process-related vibrations of the cavern etching process and the diaphragm can be provided in any shape due to the fact that a suitable binding of the diaphragm in an oxide layer produced by local oxidation is formed. The micromechanical sensor comprises: at least one substrate (1); an outer oxide layer (9) formed in a laterally outer region (4) in the substrate (1); a diaphragm (15) formed in a laterally inner diaphragm region (5) and having a number of perforations (16), and; a cavern (14) etched into the substrate (1) underneath the diaphragm (15), said diaphragm (15) being suspended in a suspending region (10) of the outer oxide layer (9), this region tapering toward the binding points (12) of the diaphragm (15), and the diaphragm (15) is, in the vertical height thereof, placed between a top side (17) and an underside (19) of the outer oxide layer (9).
Abstract:
The invention relates to a simple and cost-effective method for producing optically transparent regions (5, 6) in a silicon substrate (1) with which the optically transparent regions can be realized with any thickness and can be provided above a cavity located in the silicon substrate. To this end, at least one defined region (5, 6) of the silicon substrate (1) is firstly etched whereby rendering it porous. Afterwards, the defined porous region (5, 6) of the silicon substrate (1) is oxidized.