Abstract:
A stacked semiconductor structure includes a first substrate. A multilayer interconnect is disposed over the first substrate. Metal sections are disposed over the multilayer interconnect. First bonding features are over the metal sections. A second substrate has a front surface. A cavity extends from the front surface into a depth D in the second substrate. A movable structure is disposed over the front surface of the second substrate and suspending over the cavity. The movable structure includes a dielectric membrane, metal units over the dielectric membrane and a cap dielectric layer over the metal units. Second bonding features are over the cap dielectric layer and bonded to the first bonding features. The second bonding features extend through the cap dielectric layer and electrically coupled to the metal units.
Abstract:
A method embodiment includes providing a micro-electromechanical (MEMS) wafer including a polysilicon layer having a first and a second portion. A carrier wafer is bonded to a first surface of the MEMS wafer. Bonding the carrier wafer creates a first cavity. A first surface of the first portion of the polysilicon layer is exposed to a pressure level of the first cavity. A cap wafer is bonded to a second surface of the MEMS wafer opposite the first surface of the MEMS wafer. The bonding the cap wafer creates a second cavity comprising the second portion of the polysilicon layer and a third cavity. A second surface of the first portion of the polysilicon layer is exposed to a pressure level of the third cavity. The first cavity or the third cavity is exposed to an ambient environment.
Abstract:
Methods and apparatus for forming MEMS devices. An apparatus includes at least a portion of a semiconductor substrate having a first thickness and patterned to form a moveable mass; a moving sense electrode forming the first plate of a first capacitance; at least one anchor patterned from the semiconductor substrate and having a portion that forms the second plate of the first capacitance and spaced by a first gap from the first plate; a layer of semiconductor material of a second thickness patterned to form a first electrode forming a first plate of a second capacitance and further patterned to form a second electrode overlying the at least one anchor and forming a second plate spaced by a second gap that is less than the first gap; wherein a total capacitance is formed that is the sum of the first capacitance and the second capacitance. Methods are disclosed.
Abstract:
The present disclosure provides a micro-electro-mechanical systems (MEMS) device. In an embodiment, a device includes a substrate; a MEMS structure disposed above a sacrificial layer opening above the substrate; a release aperture disposed at substantially a same level above the sacrificial layer opening as the MEMS structure; a first cap over the MEMS structure and the sacrificial layer opening, a leg of the first cap disposed between the MEMS structure and the release aperture; and a second cap plugging the release aperture.
Abstract:
A microelectromechanical system (MEMS) device may include a MEMS structure over a first substrate. The MEMS structure comprises a movable element. Depositing a first conductive material over the first substrate and etching trenches in a second substrate. Filling the trenches with a second conductive material and depositing a third conductive material over the second conductive material and the second substrate. Bonding the first substrate and the second substrate and thinning a backside of the second substrate which exposes the second conductive material in the trenches.
Abstract:
A method embodiment includes providing a MEMS wafer comprising an oxide layer, a MEMS substrate, a polysilicon layer. A carrier wafer comprising a first cavity formed using isotropic etching is bonded to the MEMS, wherein the first cavity is aligned with an exposed first portion of the polysilicon layer. The MEMS substrate is patterned, and portions of the sacrificial oxide layer are removed to form a first and second MEMS structure. A cap wafer including a second cavity is bonded to the MEMS wafer, wherein the bonding creates a first sealed cavity including the second cavity aligned to the first MEMS structure, and wherein the second MEMS structure is disposed between a second portion of the polysilicon layer and the cap wafer. Portions of the carrier wafer are removed so that first cavity acts as a channel to ambient pressure for the first MEMS structure.
Abstract:
The present disclosure provides biochips and methods of fabricating biochips. The method includes combining three portions: a transparent substrate, a first substrate with microfluidic channels therein, and a second substrate. Through-holes for inlet and outlet are formed in the transparent substrate or the second substrate. Various non-organic landings with support medium for bio-materials to attach are formed on the first substrate and the second substrate before they are combined. In other embodiments, the microfluidic channel is formed of an adhesion layer between a transparent substrate and a second substrate with landings on the substrates.
Abstract:
A method embodiment includes providing a micro-electromechanical (MEMS) wafer including a polysilicon layer having a first and a second portion. A carrier wafer is bonded to a first surface of the MEMS wafer. Bonding the carrier wafer creates a first cavity. A first surface of the first portion of the polysilicon layer is exposed to a pressure level of the first cavity. A cap wafer is bonded to a second surface of the MEMS wafer opposite the first surface of the MEMS wafer. The bonding the cap wafer creates a second cavity comprising the second portion of the polysilicon layer and a third cavity. A second surface of the first portion of the polysilicon layer is exposed to a pressure level of the third cavity. The first cavity or the third cavity is exposed to an ambient environment.
Abstract:
A MEMS structure incorporating multiple joined substrates and a method for forming the MEMS structure are disclosed. An exemplary MEMS structure includes a first substrate having a bottom surface and a second substrate having a top surface substantially parallel to the bottom surface of the first substrate. The bottom surface of the first substrate is connected to the top surface of the second substrate by an anchor, such that the anchor does not extend through either the bottom surface of the first substrate or the top surface of the second substrate. The MEMS structure may include a bonding layer in contact with the bottom surface of the first substrate, and shaped to at least partially envelop the anchor.
Abstract:
A method of wafer level packaging includes providing a substrate including a buried oxide layer and a top oxide layer, and etching the substrate to form openings above the buried oxide layer and a micro-electro-mechanical systems (MEMS) resonator element between the openings, the MEMS resonator element enclosed within the buried oxide layer, the top oxide layer, and sidewall oxide layers. The method further includes filling the openings with polysilicon to form polysilicon electrodes adjacent the MEMS resonator element, removing the top oxide layer and the sidewall oxide layers adjacent the MEMS resonator element, bonding the polysilicon electrodes to one of a complementary metal-oxide semiconductor (CMOS) wafer or a carrier wafer, removing the buried oxide layer adjacent the MEMS resonator element, and bonding the substrate to a capping wafer to seal the MEMS resonator element between the capping wafer and one of the CMOS wafer or the carrier wafer.