Abstract:
A method of growing a thin film onto a substrate. A precursor of the film is fed into a reaction space in the form of a vapor phase pulse causing the precursor to adsorb onto the surface of the substrate to form a layer thereof. A catalyst is susequently fed into the reaction space in an amount to substantially convert the layer of the precursor to the desired thin film. The above steps may be repeated to achieve the desired film thickness.
Abstract:
A method of tungsten layer deposition for copper metallization in semiconductor devices includes reacting a tungsten carbonyl compound and a borane compound using a cyclical deposition technique. In one embodiment, the tungsten barrier layer is formed on a patterned dielectric layer by alternately adsorbing the tungsten carbonyl compound and the borane compound onto a semiconductor substrate. The tungsten layers have substantially uniform dimensions and excellent adhesion to copper such as copper seed layers or direct electroplating of copper onto the tungsten layer.
Abstract:
An apparatus and method for performing a cyclical layer deposition process, such as atomic layer deposition is provided. In one aspect, the apparatus includes a substrate support having a substrate receiving surface, and a chamber lid comprising a tapered passageway extending from a central portion of the chamber lid and a bottom surface extending from the passageway to a peripheral portion of the chamber lid, the bottom surface shaped and sized to substantially cover the substrate receiving surface. The apparatus also includes one or more valves coupled to the gradually expanding channel, and one or more gas sources coupled to each valve.
Abstract:
Nitrogen containing analogs of Copper II null-diketonates which analogs are more stable source reagents for copper deposition when substantially free of solvents of excess ligands. The nitrogen containing analogs replace -O- with nullN(Rnull)nullwherein Rnull is an alkyl group having from one to four carbon atoms. Replacement of each -O- is preferred although replacement of one -O- per cyclic ring is sufficient to improve stability of the copper source reagents. The source reagent can be purified by sublimation to remove solvents and excess ligands prior to semiconductor processing.
Abstract:
A processing chamber is adapted to perform a deposition process on a substrate. The chamber includes a pedestal adapted to hold a substrate during deposition and a gas mixing and distribution assembly mounted above the pedestal. The gas mixing and distribution assembly includes a face plate, a dispersion plate mounted above the face plate, and a mixing fixture mounted above the dispersion plate. The face plate is adapted to present an emissivity invariant configuration to the pedestal. The mixing fixture includes a mixing chamber to which a process gas is flowed and an outer chamber surrounding the mixing chamber. The processing chamber further includes an enclosure and a liner installed inside the enclosure and surrounding the pedestal. The liner defines a gap between the liner and the enclosure. The gap has a minimum width adjacent an exhaust port and a maximum width at a point that is diametrically opposite the exhaust port.
Abstract:
A method of forming a copper via and the resultant structure. A thin layer of an insulating barrier material, such as aluminum oxide or tantalum nitride, is conformally coated onto the sides and bottom of the via hole, for example, by atomic layer deposition (ALD) to a thickness of less than 5 nm, preferably less than 2 nm and having an electrical resistivity of more than 500 microohm-cm. A copper seed layer is then deposited under conditions such that copper is deposited on the via sidewalls but not deposited over most of the bottom of via hole. Instead energetic copper ions sputter the barrier material from the via bottom. Copper is electroplated into the via hole lined only on its sidewalls with the barrier. The invention preferably extends also to dual-damascene structures in which the copper seed sputter process sputters the barrier layer from the via bottom but not the trench floor.
Abstract:
A process of forming a via through a inter-level dielectric layer and the product. The via is formed by etching a via hole through the inter-level dielectric layer in an area overlying a conductive feature, such a lower copper metallization. Atomic layer deposition (ALD) forms a very thin refractory metal nitride barrier layer over the sidewalls and bottom of the via. Its thickness is less than 1.5 nm, and may be formed with no more than six ALD cycle. A copper seed layer is sputtered onto the barrier including the bottom portion, and copper is electrochemically filled into the hole. The barrier is thin enough to have a low electrical resistance, as may be explained by electronic quantum mechanical tunneling. Further, the crystallography and defects of the underlying copper continue across the thin barrier into the overlying copper.
Abstract:
A precursor and method for filling a feature in a substrate. The method generally includes depositing a barrier layer, the barrier layer being formed from pentakis(dimethylamido)tantalum having less than about 5 ppm of chlorine. The method additionally may include depositing a seed layer over the barrier layer and depositing a conductive layer over the seed layer. The precursor generally includes pentakis(dimethylamido)tantalum having less than about 5 ppm of chlorine. The precursor is generated in a canister having a surrounding heating element configured to reduce formation of impurities.
Abstract:
In accordance with an embodiment of the invention, a processing chamber is configured to carry out chemical vapor deposition (CVD). An ampoule vaporizer is fastened to the chamber, and is configured to convert a fluorine-free tungsten-containing solid compound to vapor delivered to the chamber for use in the CVD. In one embodiment, the solid compound is tungsten hexacarbonyl (W(CO)6). In another embodiment, a mass flow controller is fastened to the chamber, and is configured to receive the vapor from the ampoule vaporizer, regulate the flow of the vapor, and deliver the vapor to the chamber. In yet another embodiment, the chamber includes a funnel-shaped dispersion plate configured to receive a gas mixture and direct the gas mixture toward a surface of the wafer in a substantially uniform manner.
Abstract:
Embodiments of the invention relate to an apparatus and method of cyclical layer deposition utilizing three or more precursors. In one embodiment, the method includes providing at least one cycle of precursors to form a ternary material layer. Providing at least one cycle of precursors includes introducing a pulse of a first precursor, introducing a pulse of a second precursor, and introducing a pulse of a third precursor, wherein the pulses of two of the three precursors are introduced simultaneously or sequentially. In anoher embodiment, the method includes introducing a pulse of a first precursor, introducing a pulse of a second precursor, repeating the introduction of the first and the second precursors at least one time to form a binary material layer on the substrate surface, and introducing a pulse of a third precursor to form the ternary material layer.