Abstract:
An array of microtubes upwardly extending from a supporting base of substrate material is provided, in which the tubes comprise at least one concentric layer comprising a metallic oxide and at least one concentric layer comprising a piezoelectric and/or ferroelectric material. The array is made by lining the walls of pores in the substrate material sequentially with metallic oxide and piezoelectric and/or ferroelectric material and then removing part but not all of the substrate material. The arrays may be used in a variety of applications including liquid delivery and as microelectronic components. A method of generating terahertz emission is also provided.
Abstract:
A method of removing a polymeric coating from sidewalls of an etched trench defined in a silicon wafer is provided. The method comprises etching the wafer in a biased plasma etching chamber using an O2 plasma. The chamber temperature is in the range of 90 to 180 °C.
Abstract:
A process for filling one or more etched holes defined in a frontside surface of a wafer substrate. The process includes the steps of: (i) depositing a layer of a thermoplastic first polymer onto the frontside surface and into each hole; (ii) reflowing the first polymer; (iii) exposing the wafer substrate to a controlled oxidative plasma; (iv) optionally repeating steps (i) to (iii); (v) depositing a layer of a photoimageable second polymer; (vi) selectively removing the second polymer from regions outside a periphery of the holes using exposure and development; and (vii) planarizing the frontside surface to provide holes filled with a plug comprising the first and second polymers, which are different than each other. Each plug has a respective upper surface coplanar with the frontside surface.
Abstract:
A method of photoresist removal with concomitant de-veiling is provided. The method employs a plasma formed from a gas chemistry comprising O 2 , NH 3 and a fluorine-containing gas, such as CF 4 . The method is particularly suitable for use in MEMS fabrication processes, such as inkjet printhead fabrication.
Abstract:
An array of microtubes upwardly extending from a supporting base of substrate material is provided, in which the tubes comprise at least one concentric layer comprising a metallic oxide and at least one concentric layer comprising a piezoelectric and/or ferroelectric material. The array is made by lining the walls of pores in the substrate material sequentially with metallic oxide and piezoelectric and/or ferroelectric material and then removing part but not all of the substrate material. The arrays may be used in a variety of applications including liquid delivery and as microelectronic components. A method of generating terahertz emission is also provided.
Abstract:
The present invention provides a semiconductor device for a thermal inkjet (TIJ) device or a micro-electromechanical systems (MEMS) device. The device comprises a silicon wafer substrate having a front side and a back side, and a silicon nitride layer on the back side of the silicon wafer substrate.
Abstract:
A process for filling one or more etched holes defined in a frontside surface of a wafer substrate. The process includes the steps of: (i) depositing a layer of a thermoplastic first polymer onto the frontside surface and into each hole; (ii) reflowing the first polymer; (iii) exposing the wafer substrate to a controlled oxidative plasma; (iv) optionally repeating steps (i) to (iii); (v) depositing a layer of a photoimageable second polymer; (vi) selectively removing the second polymer from regions outside a periphery of the holes using exposure and development; and (vii) planarizing the frontside surface to provide holes filled with a plug comprising the first and second polymers, which are different than each other. Each plug has a respective upper surface coplanar with the frontside surface.
Abstract:
The present disclosure pertains to our discovery of a particularly efficient method for etching a multi-part cavity in a substrate. The method provides for first etching a shaped opening, depositing a protective layer over at least a portion of the inner surface of the shaped opening, and then etching a shaped cavity directly beneath and in continuous communication with the shaped opening. The protective layer protects the etch profile of the shaped opening during etching of the shaped cavity, so that the shaped opening and the shaped cavity can be etched to have different shapes, if desired. In particular embodiments of the method of the invention, lateral etch barrier layers and/or implanted etch stops are also used to direct the etching process. The method of the invention can be applied to any application where it is necessary or desirable to provide a shaped opening and an underlying shaped cavity having varying shapes. The method is also useful whenever it is necessary to maintain tight control over the dimensions of the shaped opening.