Abstract:
A method for forming a dual damascene including providing a first dielectric insulating layer including a via opening; forming an organic dielectric layer over the first IMD layer to include filling the via opening; forming a hardmask layer over the organic dielectric layer; photolithographically patterning and dry etching the hardmask layer and organic dielectric layer to leave a dummy portion overlying the via opening; forming an oxide liner over the dummy portion; forming a second dielectric insulating layer over the oxide liner to surround the dummy portion; planarizing the second dielectric insulating layer to expose the upper portion of the dummy portion; and, removing the organic dielectric layer to form a dual damascene opening including the oxide liner lining trench line portion sidewalls.
Abstract:
A method of forming a dual damascene opening comprising the following steps. A structure having an overlying exposed conductive layer formed thereover is provided. A dielectric layer is formed over the exposed conductive layer. An anti-reflective coating layer is formed over the dielectric layer. The anti-reflective layer and the dielectric layer are etched using a via opening process to form an initial via exposing a portion of the conductive layer. A protective film portion is formed over at least the exposed portion of the conductive layer. The anti-reflective coating layer and the dielectric layer are patterned to reduce the initial via to a reduced via and to form a trench opening substantially centered over the reduced via. The trench opening and the reduced via comprising the dual damascene opening.
Abstract:
A method of reducing fluorine contamination on a integrated circuit wafer surface is achieved. The method comprises placing an integrated circuit wafer on a cathode stage. The integrated circuit wafer comprises a surface contaminated with fluorine. The integrated circuit wafer is plasma treated with a plasma comprising a reducing gas that forms HF from the fluorine and a bombardment gas that removes the fluorine from the surface. The cathode stage is heated to thereby increase the rate of the fluorine removal.
Abstract:
A method for eliminating the problems associated with the discontinuous deposition of the glue layer at the bottom of the via resulting from the notch in the silicon nitride etch stop layer. First conductive layer traces are patterned and a silicon nitride (SiN) etch stop layer is provided overlying the first conductive layer. An inter-metal dielectric (IMD) layer then overlies the entire surface. An anisotropic etch is performed leaving via holes in the IMD layer. This is followed by a second anisotropic etch step to remove the etch stop layer not protected by the IMD layer resulting in the formation a notch at the bottom of the via hole. An important step of the present invention is the elimination of this notch accomplished by nitridizing the surface of the IMD layer. A wet polymer cleaning is performed to remove the nitridized IMD surface and eliminating the notch. A glue layer is conformally applied lining the via hole. A second conductive layer is then deposited and the surface is planarized.
Abstract:
Within a method for etching a trench within a silicon oxide layer there is first provided a substrate. There is then formed over the substrate a silicon oxide layer. There is then formed over the silicon oxide layer a masking layer. There is then etched, while employing a plasma etch method in conjunction with the masking layer as an etch mask layer, the silicon oxide layer to form an etched silicon oxide layer defining a trench. Within the method, the plasma etch method employs an etchant gas composition comprising: (1) octafluorocyclobutane; and (2) at least one of carbon tetrafluoride, difluoromethane, hexafluoroethane and oxygen; but excluding (3) a carbon and oxygen containing gas.
Abstract:
A method for forming a patterned hard mask layer. There is first provided a substrate. There is then formed over the substrate a blanket hard mask layer formed of a hard mask material susceptible to etching within a first plasma etch method, where the first plasma etch method employs a first etchant gas composition which upon plasma activation forms an active fluorine containing etchant species. There is then formed over the blanket hard mask layer a patterned photoresist layer. There is then etched, while employing the first plasma etch method in conjunction with the patterned photoresist layer as a first etch mask layer, the blanket hard mask layer to form a patterned hard mask layer which defines a first aperture. The first plasma etch method also forms at the bottom of the first aperture defined by the patterned hard mask layer a residue. Finally, there is then etched, while employing a second etch method, the residue from the bottom of the first aperture. The patterned hard mask layer may then be employed for forming within a microelectronic layer, such as a semiconductor substrate, formed beneath the microelectronic layer, an aperture, such as an isolation trench, while employing a third plasma etch method. There may then be formed within the aperture a planarized aperture fill layer, such as a planarized trench isolation region, with enhanced planarity.
Abstract:
A process for plasma etching of contact and via openings in low-k organic polymer dielectric layers is described which overcomes problems of sidewall bowing and hardmask pattern deterioration by etching the organic layer in a high density plasma etcher with a chlorine/inert gas plasma. By adding chlorine to the oxygen/inert gas plasma, the development of an angular aspect or faceting of the hardmask pattern edges by ion bombardment is abated. Essentially vertical sidewalls are obtained in the openings etched in the organic polymer layer while hardmask pattern integrity is maintained. The addition of a passivating agent such as nitrogen, BCl.sub.3, or CHF.sub.3 to the etchant gas mixture further improves the sidewall profile by reducing bowing through protective polymer formation.
Abstract:
Provided is a method of preventing or treating gastroesophageal reflux disease, including administering to an subject in need thereof a composition including a plurality of fibers formed of β-1-4-glucan, wherein the fibers have a diameter between 15 nm and 35 nm and a mean length of between 1.5 μm and 3.5 μm.
Abstract:
The invention relates to integrated circuit fabrication, and more particularly to a metal gate electrode. An exemplary structure for a semiconductor device comprises a substrate comprising a major surface; a first rectangular gate electrode on the major surface comprising a first layer of multi-layer material; a first dielectric material adjacent to one side of the first rectangular gate electrode; and a second dielectric material adjacent to the other 3 sides of the first rectangular gate electrode, wherein the first dielectric material and the second dielectric material collectively surround the first rectangular gate electrode.
Abstract:
The invention relates to integrated circuit fabrication, and more particularly to a metal gate structure. An exemplary structure for a CMOS semiconductor device comprises a substrate comprising an isolation region surrounding and separating a P-active region and an N-active region; a P-metal gate electrode over the P-active region and extending over the isolation region, wherein the P-metal gate electrode comprises a P-work function metal and an oxygen-containing TiN layer between the P-work function metal and substrate; and an N-metal gate electrode over the N-active region and extending over the isolation region, wherein the N-metal gate electrode comprises an N-work function metal and a nitrogen-rich TiN layer between the N-work function metal and substrate, wherein the nitrogen-rich TiN layer connects to the oxygen-containing TiN layer over the isolation region.