Abstract:
Method and apparatus of to obtain as-deposited polycrystalline and low-stress SiGe layers. These layers are used in Micro Electro-Mechanical Systems (MEMS) devices or micromachined structures. Different parameters are analysed which effect the stress in a polycrystalline layer. The parameters include, without limitation: deposition temperature; concentration of semiconductors (e.g., the concentration of Silicon and Germanium in a SixGe1-x layer, with x being the concentration parameter); concentration of dopants (e.g., the concentration of Boron or Phosphorous); amount of pressure; and use of plasma. Depending on the particular environment in which the polycrystalline SiGe is grown, different values of parameters are used.
Abstract:
The present invention relates to microsystems having flexibility properties so as to enable folding of the microsystem in any three-dimensional direction. That is, enabling torsional and three-dimensionally non-linearly bending of the microsystem. The present invention provides a flexible three-dimensional microsystem compatible with hostile environments such as encountered within a biological body. In particular, provides a bio-compatible three-dimensional microsystem operational in hostile environments while biological acceptable to biological bodies. The present invention further provides an overall stress stability since forming a unitary structure eliminating stress induced or caused by joining various parts of different materials having different material properties into an assembly.
Abstract:
Method of fabrication of an infrared radiation detector, and preferably an infrared sensitive bolometer, comprising the following steps:
forming a sacrificial material layer (11, 12 or 43) on a substrate (10 or 41), patterning said sacrificial material layer (11, 12 or 43), depositing an active layer (13 or 42) made of polycrystalline SiGe, patterning said polycrystalline SiGe layer (13 or 42) in order to form an active area (16 or 47) and supports (15 or 48) of the detector, performing a high doping of the supports (15 or 48) and a moderate doping of the active area (16 or 47), depositing a stack of layers in order to form an IR absorber, removing the sacrificial material layer (11, 12 or 43).
Abstract:
In one embodiment, a method of forming a MEMS device includes providing a substrate, forming a sacrificial layer above the substrate layer, forming a silicon based working portion on the sacrificial layer, releasing the silicon based working portion from the sacrificial layer such that the working portion includes at least one exposed outer surface, forming a first layer of silicide forming metal on the at least one exposed outer surface of the silicon based working portion, and forming a first silicide layer with the first layer of silicide forming metal.
Abstract:
A method for producing separate micromechanical parts arranged on a silicon substrate (1) encompasses the following steps: a) separation trenches (7) are formed on the substrate by means of a deep anisotropic plasma etching process; b) the zone (9, 12) of the silicon substrate (1) that forms the bottom of separation trenches (6) is irradiated with laser light (11) such that the silicon substrate (1) changes from a crystalline state into an at least partially amorphous state in said zone (9, 12); c) mechanical stresses are induced in the substrate (1). In one embodiment, caverns (2) are etched at the same time as the separation trenches (6) are etched. The etching depths can be controlled using the RIE lag effect.
Abstract:
A micromechanical structure and a method of fabricating a micromechanical structure are provided. The micromechanical structure comprises a silicon (Si) based substrate; a micromechanical element formed directly on the substrate; and an undercut formed underneath a released portion of the micromechanical element; wherein the undercut is in the form of a recess formed in the Si based substrate.
Abstract:
Method and apparatus of to obtain as-deposited polycrystalline and low-stress SiGe layers. These layers are used in Micro Electro-Mechanical Systems (MEMS) devices or micromachined structures. Different parameters are analysed which effect the stress in a polycrystalline layer. The parameters include, without limitation: deposition temperature; concentration of semiconductors (e.g., the concentration of Silicon and Germanium in a SixGe1-x layer, with x being the concentration parameter); concentration of dopants (e.g., the concentration of Boron or Phosphorous); amount of pressure; and use of plasma. Depending on the particular environment in which the polycrystalline SiGe is grown, different values of parameters are used.
Abstract:
A method for producing a unitary flexible microelement from a supporting wafer is provided. The unitary flexible microelement defines a supporting body having a solid region and a flexible region consisting of a thin part of the supporting wafer. The method comprises the following steps: defining thickness of the flexible region and growing an upper insulating layer to the upper surface covering the predefined area and growing a lower insulating layer to the lower surface covering the solid region. The method comprises defining a conductive layer on the predefined area of the upper surface, depositing a final insulating layer on the upper surface covering the conductive layer and depositing a metallic protective layer on the upper surface covering the insulating layer. Furthermore, the method comprises etching the lower surface until the etching reaches the thickness of the flexible region, and deepositing a conductive layer on the lower surface to establish a coaxial conductor.