Abstract:
A semiconductor substrate for a micro-fluid ejection head. The substrate includes a plurality of fluid ejection actuators disposed on the substrate. Each of the fluid ejection actuators includes a thin heater stack comprising a thin film heater and one or more protective layers adjacent the heater. The thin film heater is made of a tantalum-aluminum-nitride thin film material having a nano-crystalline structure consisting essentially of A1N, TaN, and TaA1 alloys, and has a sheet resistance ranging from about 30 to about 100 ohms per square. The thin film material contains from about 30 to about 70 atomic% tantalum, from about 10 to about 40 atomic% aluminum and from about 5 to about 30 atomic% nitrogen.
Abstract:
An ink jet printhead for an ink jet printer and method for making an improved printhead. The printhead includes a nozzle plate attached to a heater chip. The heater chip is a semiconductor substrate having a resistive layer deposited on the substrate, a dielectric layer deposited on the resistive layer, a cavitation layer for contact with ink, and an adhesion layer between the dielectric layer and cavitation layer. The adhesion layer is selected from the group consisting of tantalum nitride (TaN), tantalum oxide (TaO), silicon nitride (SiN), and titanium nitride (TiN), provided the adhesion layer and cavitation layer are selected so that the adhesion layer has no elemental component in common with the cavitation layer when the dielectric layer is comprised of SiC/SiN. Adhesion between the dielectric layer and cavitation layer is significantly enhanced by the invention.
Abstract:
A micro-fluid ejection device structure and method therefor having improved low energy design. The devices includes a semiconductor substrate and an insulating layer deposited on the semiconductor substrate. A plurality of heater resistors are formed on the insulating layer from a resistive layer selected from the group consisting of TaAI, Ta2N, TaAI(O,N), TaA1Si, Ti(N,O), WSi(O,N), TaA1N, and TaAI/TaA1N. A sacrificial layer selected from an oxidizable metal and having a thickness ranging from about 500 to about 5000 Angstroms is deposited on the plurality of heater resistors. Electrodes are formed on the sacrificial layer from a first metal conductive layer to provide anode and cathode connections to the plurality of heater resistors. The sacrificial layer is oxidized in a plasma oxidation process to provide a fluid contact layer on the plurality of heater resistors.
Abstract:
A silver dispersion is obtained by reducing a silver compound in the presence of a polymeric dispersant of an ionic hydrophilic segments, such as methacrylic acid segments con and nonionic hydrophilic segments such as hydroxyl terminated polyethylene glycol segments. Aqueous inkjet inks may contain such dispersants and other common ingredients such as a humectant. The inks can be printed on ceramic substrates and sintered under heat to form solid, conductive patterns of silver.
Abstract:
A semiconductor device containing at least one transistor (14) and at least one heater resistor (18) in a heater resistor area adjacent the at least one transistor on a semiconductor substrate (22). The device includes a silicon substrate (22) containing contact openings for metal contacts (34) to the at least one transistor. A barrier layer (42) is in the contact openings and in the heater resistor area and provides a diffusion barrier/heater resistor layer. The barrier layer is selected from a group consisting of TaN, Ta/TaAl, TaN/TaAl, TiWN, TaAlN, TiN, Ta(Nx, Oy), WSi(Nx, Oy), TaSi, TaSiN, WSiN, and TaSi(Nx, Oy). A conductive layer (44) is adjacent at least a portion of the barrier layer for providing connection between a power source and the at least one heater resistor and at least one transistor. The semiconductor device is devoid of a patterned and etched barrier layer in the heater resistor area.
Abstract:
The present disclosure is directed to a micro-fluid ejection head for a microfluid ejection device. The head includes a semiconductor substrate, a fluid ejection actuator supported by the semiconductor substrate, a nozzle member containing nozzle holes attached to the substrate for expelling droplets of fluid from one or more nozzle holes in the nozzle member upon activation of the ejection actuator. The substrate further includes a thermal insulating barrier layer between the semiconductor substrate and the fluid ejection actuator. The thermal insulating barrier layer includes a porous, substantially impermeable material having a thermal conductivity of less than about 1 W/m-K.
Abstract:
A substantially planar fluid ejection actuator (30) and methods for manufacturing substantially planar fluid ejection actuators for micro- fluid ejection heads (80). One such fluid ejection actuator includes a conductive layer (36) adjacent to a substrate (32) that is configured to define an anode segment (36A) spaced apart from a cathode segment (36B). A thermal barrier segment (38) is disposed between the anode and cathode segments. A substantially planar surface is defined by the anode segment, cathode segment, and the thermal barrier segment A resistive layer (40) is applied adjacent to the substantially planar surface.
Abstract:
An inkjet printhead heater chip has a silicon substrate with a heater stack formed of a plurality of thin film layers thereon for ejecting an ink drop during use. The thin film layers include: a thermal barrier layer on the silicon substrate; a resistor layer on the thermal barrier layer; a doped diamond-like carbon layer on the resistor layer; and a cavitation layer on the doped diamond-like carbon layer. The doped diamond-like carbon layer preferably includes silicon but may also include nitrogen, titanium, tantalum, combinations thereof or other. When it includes silicon, a preferred silicon concentration ranges from 20 to 25 atomic percent. A preferred cavitation layer includes an undoped diamond-like carbon, tantalum or titanium layer. The doped diamond-like carbon layer ranges in thickness from 500 to 3000 angstroms. The cavitation layer ranges from 500 to 6000 angstroms. Inkjet printheads and printers are also disclosed.
Abstract:
An inkjet printhead heater chip has a silicon substrate with a heater stack formed of a plurality of thin film layers thereon for ejecting an ink drop during use. The thin film layers include: a thermal barrier layer on the silicon substrate; a resistor layer on the thermal barrier layer; a doped diamond-like carbon layer on the resistor layer; and a cavitation layer on the doped diamond-like carbon layer. The doped diamond-like carbon layer preferably includes silicon but may also include nitrogen, titanium, tantalum, combinations thereof or other. When it includes silicon, a preferred silicon concentration ranges from 20 to 25 atomic percent. A preferred cavitation layer includes an undoped diamond-like carbon, tantalum or titanium layer. The doped diamond-like carbon layer ranges in thickness from 500 to 3000 angstroms. The cavitation layer ranges from 500 to 6000 angstroms. Inkjet printheads and printers are also disclosed.
Abstract:
A semiconductor device containing at least one transistor (14) and at least one heater resistor (18) in a heater resistor area adjacent the at least one transistor on a semiconductor substrate (22). The device includes a silicon substrate (22) containing contact openings for metal contacts (34) to the at least one transistor. A barrier layer (42) is in the contact openings and in the heater resistor area and provides a diffusion barrier/heater resistor layer. The barrier layer is selected from a group consisting of TaN, Ta/TaAl, TaN/TaAl, TiWN, TaAlN, TiN, Ta(Nx, Oy), WSi(Nx, Oy), TaSi, TaSiN, WSiN, and TaSi(Nx, Oy). A conductive layer (44) is adjacent at least a portion of the barrier layer for providing connection between a power source and the at least one heater resistor and at least one transistor. The semiconductor device is devoid of a patterned and etched barrier layer in the heater resistor area.