Abstract:
A method of functionalizing a nanomechanical resonator involving providing a wafer with a thin film layer on a sacrificial layer, suspending freely a resonator on the wafer, coating the resonator with a liquid containing a terminal allyl group, placing a quartz-mask on the wafer, trapping the liquid between the mask and the wafer, initiating a reaction of the terminal allyl with photo-induced electrons, rinsing the wafer, and drying the wafer. The liquid can be 2-allyl hexafluoroisopropanol or another liquid that has an effective sorbent group for DMMP or DNT. The initiating can be performed via a deep UV source selected from a Hg arc, Xe arc, or DUV laser. The method can further include incorporating narrow gaps of from about 50 to about 300 nm in the resonator.
Abstract:
A wafer-level packaged integrated circuit includes a semiconductor substrate including a first silicon layer. A micro-electromechanical system (MEMS) device is integrated into the first silicon layer. A thin-film deposited sealing member is deposited over the first silicon layer and is configured to seal a cavity in the first silicon layer. At least one additional layer is formed over the sealing member. At least one under bump metallization (UBM) is formed over the at least one additional layer.
Abstract:
A silicon processing method includes: forming a mask pattern on a principal plane of a single-crystal silicon substrate; and applying crystal anisotropic etching to the principal surface to form a structure including a (111) surface and a crystal surface equivalent thereto and having width W1 and length L1. The principal plane includes a (100) surface and a crystal surface equivalent thereto or a (110) surface and a crystal surface equivalent thereto. A determining section for determining the width W1 of the structure is formed in the mask pattern. The width of the determining section for the width W1 of the mask pattern is width W2. The width of the mask pattern other than the determining section is larger than the width W2 over a length direction of the mask pattern.
Abstract:
A method for forming a vibrating micromechanical structure having a single crystal silicon (SCS) micromechanical resonator formed using a two-wafer process, including either a Silicon-on-insulator (SOI) or insulating base and resonator wafers, wherein resonator anchors, capacitive air gap, isolation trenches, and alignment marks are micromachined in an active layer of the base wafer; the active layer of the resonator wafer is bonded directly to the active layer of the base wafer; the handle and dielectric layers of the resonator wafer are removed; windows are opened in the active layer of the resonator wafer; masking the active layer of the resonator wafer with photoresist; a SCS resonator is machined in the active layer of the resonator wafer using silicon dry etch micromachining technology; and the photoresist is subsequently dry stripped. A patterned SCS cover is bonded to the resonator wafer resulting in hermetically sealed chip scale wafer level vacuum packaged devices.
Abstract:
The invention relates to a method of making a component from a heterogeneous substrate comprising first and second portions in at least one monocrystalline material, and a sacrificial layer constituted by at least one stack of at least one layer of monocrystalline Si situated between two layers of monocrystalline SiGe, the stack being disposed between said first and second portions of monocrystalline material, wherein the method consists in etching said stack by making: e) at least one opening in the first and/or second portion and the first and/or second layer of SiGe so as to reach the layer of Si; and f) eliminating all or part of the layer of Si.
Abstract:
Micro-electromechanical system (MEMS) devices and methods of manufacture thereof are disclosed. In one embodiment, a MEMS device includes a first semiconductive material and at least one trench disposed in the first semiconductive material, the at least one trench having a sidewall. An insulating material layer is disposed over an upper portion of the sidewall of the at least one trench in the first semiconductive material and over a portion of a top surface of the first semiconductive material proximate the sidewall. A second semiconductive material or a conductive material is disposed within the at least one trench and at least over the insulating material layer disposed over the portion of the top surface of the first semiconductive material proximate the sidewall.
Abstract:
An electromechanical resonator including a vibrating body, at least one excitation electrode, and at least one detection electrode. The vibrating body includes a first part made of a first material with a first Young's modulus and a second part made of a second material with a second Young's modulus, less than the first Young's modulus, the second part being at least partially located facing the detection electrode.
Abstract:
The present invention provides a method for manufacturing a semiconductor device which has an integrated circuit provided on a semiconductor substrate and a movable part which is movable relative to the substrate. This manufacturing method includes: a step of covering the movable part with a sacrificial film; a step of covering the sacrificial film with a first sealing layer which is formed of a material having a tensile stress; a step of forming a through-hole in the first sealing layer; a step of removing the sacrificial film through the through-hole to form a void around the movable part; and a step of film-forming a second sealing layer on the first sealing layer to close the through-hole.
Abstract:
An electromechanical resonator includes a resonator portion which includes a fixed electrode and an oscillator formed separately from the fixed electrode with a gap. The gap has a first gap region and a second gap region which are arranged in a thickness direction of the fixed electrode. The first gap region is different in width from the second gap region.
Abstract:
A method for fabrication of single crystal silicon micromechanical resonators using a two-wafer process, including either a Silicon-on-insulator (SOI) or insulating base and resonator wafers, wherein resonator anchors, a capacitive air gap, isolation trenches, and alignment marks are micromachined in an active layer of the base wafer; the active layer of the resonator wafer is bonded directly to the active layer of the base wafer; the handle and dielectric layers of the resonator wafer are removed; viewing windows are opened in the active layer of the resonator wafer; masking the single crystal silicon semiconductor material active layer of the resonator wafer with photoresist material; a single crystal silicon resonator is machined in the active layer of the resonator wafer using silicon dry etch micromachining technology; and the photoresist material is subsequently dry stripped.