Abstract:
A method of polymeric coating from sidewalls of en etched trench defined in silicon wafer [5] was provided The method comprises etching the wafer in a biased plasma etching chamber using 02 plasma. The chamber temperature is in the range of 90-180 deg C.
Abstract:
A method for adjusting with high precision the width of gaps between micromachined structures or devices in an epitaxial reactor environment. Providing a partially formed micromechanical device, comprising a substrate layer, a sacrificial layer including silicon dioxide deposited or grown on the substrate and etched to create desired holes and/or trenches through to the substrate layer, and a function layer deposited on the sacrificial layer and the exposed portions of the substrate layer and then etched to define micromechanical structures or devices therein. The etching process exposes the sacrificial layer underlying the removed function layer material. Cleaning residues from the surface of the device, then epitaxially depositing a layer of gap narrowing material selectively on the surfaces of the device. The selection of deposition surfaces determined by choice of materials and the temperature and pressure of the epitaxy carrier gas. The gap narrowing epitaxial deposition continues until a desired gap width is achieved, as determined by, for example, an optical detection arrangement. Following the gap narrowing step, the micromachined structures or devices may be released from their respective underlying sacrificial layer.
Abstract:
The invention concerns a process for producing etched structures in substrates by means of anisotropic plasma etching. An isotropic etching operation and a side wall passivation are carried out in separate and alternating operations. The substrate (2) is a polymer, a metal, or a multi-component system and portions (8) of the side wall passivation layer (6) applied during the side wall passivation are transferred to the exposed lateral surfaces (7') of the side wall (7) during each subsequent etching operations as a result of which the entire process becomes anisotropic.
Abstract:
The invention provides a single mask, low temperature reactive ion etching process for fabricating high aspect ratio, released single crystal microelectromechanical structures independent of crystal orientation. A dielectric mask (12) on a single-crystal substrate (154) is patterned to define isolating trenches. A protective conformal layer (28) is applied to the resultant structure. The conformal layer (28) on the floor of the trenches is removed and a second etch deepens the trench to expose the mesa walls which are removed during the release step by isotropic etching. A metal layer (44) is formed on the resultant structure providing opposed plates (156) and (158) of a capacitor. The cantilever beam (52) with the supporting end wall (152) extends the grid-like structure (150) into the protection of the deepened isolation trenches (54). A membrane can be added to the released structures to increase their weight for use in accelerometers, and polished for use as movable mirrors.
Abstract:
L'invention concerne un procédé d'attaque anisotrope de structures délimitées avec un masque d'attaque, de préférence des évidements dont les côtés sont exactement délimités, au moyen d'un plasma. Selon ce procédé, on obtient à la fois une sélectivité élevée du masque et une très forte anisotropie des structures attaquées. A cet effet, ce procédé d'attaque anisotrope comprend les opérations successives séparées et alternées de polymérisation et d'attaque.
Abstract:
A method of reactive ion etching a substrate 46 to form at least a first and a second etched feature (42, 44) is disclosed. The first etched feature (42) has a greater aspect ratio (depth:width) than the second etched feature (44). In a first etching stage the substrate (46) is etched so as to etch only said first feature (42) to a predetermined depth. Thereafter in a second etching stage, the substrate (46) is etched so as to etch both said first and said second features (42, 44) to a respective depth. A mask (40) may be applied to define apertures corresponding in shape to the features (42, 44). The region of the substrate (46) in which the second etched feature (44) is to be produced is selectively masked with a second maskant (50) during the first etching stage. The second maskant (50) is then removed prior to the second etching stage.
Abstract:
The invention relates to a microstructured substrate comprising a plurality of at least one elementary microstructure (3), and to the method for producing said microstructured substrate. Said at least one elementary microstructure (3) has a long shape and opposing longitudinal lower (3a) and upper (3b) ends, the lower end (3a) being connected to the substrate, and also comprises an open cavity (5) on the upper end (3b) thereof, said microstructured substrate comprising alumina on the surface thereof. The invention also relates to an electrical storage device, more specifically an all-solid battery, comprising the microstructured substrate according to the invention.
Abstract:
The invention relates to fluid paths in etchable materials. Fluid paths are formed by forming a cavity through a substrate material with a first dry removal process to produce a first surface of the cavity. The first surface of the cavity is associated with a first roughness. The first surface of the cavity is etched with a second wet removal process to reduce the first roughness and produce a second roughness associated with the first surface of the cavity. A coating is applied to the first surface of the cavity to produce a second surface to improve wettability of the first or second surface of the cavity, reduce in size or number gas nucleation sites in the first or second surface of the cavity, reduce the amount of debris associated with the first roughness carried by the fluid flow, and/or improve hydrophilicity of the first or second surface.
Abstract:
The invention relates to a method for producing porous micro-needles (10) that are arranged on a silicon substrate (5) in an array, for the transdermal administration of medicaments and to the use of said micro-needles. Said method consists of the following steps, a silicon substrate (5) is prepared, a first etching mask is applied, micro-needles (10) are structured by means of a DRIE-process (deep reactive ion etching), the first etching mask is removed and the Si-substrate (5) is at least partially made porous. The porous making process starts on the front side (15) of the Si-substrate (5) and a porous reservoir is formed.