Abstract:
The present invention provides a method of fabricating a semiconductor device, which could advance the commercialization of semiconductor devices with a copper interconnect. In a process of metal interconnect line fabrication, a TiN thin film combined with an Al intermediate layer is used as a diffusion barrier on trench or via walls. For the formation, Al is deposited on the TiN thin film followed by copper filling the trench. Al diffuses to TiN layer and reacts with oxygen or nitrogen, which will stuff grain boundaries efficiently, thereby blocking the diffusion of copper successfully.
Abstract:
Methods and systems for depositing a film on a substrate are disclosed. In one embodiment, a method includes converting a non-gaseous precursor into vapor phase. Converting the precursor includes: forming a fluidized bed by flowing gas at a sufficiently high flow rate to suspend and stir a plurality of solid particles, and converting the phase of the non-gaseous precursor into vapor phase in the fluidized bed. The method also includes transferring the precursor in vapor phase through a passage; and performing deposition on one or more substrates with the transferred precursor in vapor phase.
Abstract:
A dielectric film is formed by atomic layer deposition to conformally fill a narrow, deep trench for device isolation. The method of the illustrated embodiments includes alternately pulsing vapor-phase reactants in a string of cycles, where each cycle deposits no more than about a monolayer of material, capable of completely filling high aspect ratio trenches. Additionally, the trench-fill material composition can be tailored by processes described herein, particularly to match the coefficient of thermal expansion (CTE) to that of the surrounding substrate within which the trench is formed. Mixed phases of mullite and silica have been found to meet the goals of device isolation and matched CTE. The described process includes mixing atomic layer deposition cycles of aluminum oxide and silicon oxide in ratios selected to achieve the desired composition of the isolation material, namely on the order of 30% alumina and 70% silicon oxide by weight.
Abstract:
A method and apparatus is provided for determining substrate drift from its nominal or intended position. The apparatus includes at least two fixed reference points. The reference points can be fixed with respect to the processing tool, or with respect to the end effector. As a robotic arm moves the end effector and substrate along a path, a camera captures images of the edge of the substrate and the reference points. Two or more cameras can also be provided. A computer can then calculate positional drift of the substrate, relative to its expected or centered position on the end effector, based upon these readings, and this drift can be corrected in subsequent robotic arm movement.
Abstract:
Method and structures are provided for conformal lining of dual damascene structures in integrated circuits. Trenches and contact vias are formed in insulating layers. The trenches and vias are exposed to alternating chemistries to form monolayers of a desired lining material. Exemplary process flows include alternately pulsed metal halide and ammonia gases injected into a constant carrier flow. Self-terminated metal layers are thus reacted with nitrogen. Near perfect step coverage allows minimal thickness for a diffusion barrier function, thereby maximizing the volume of a subsequent filling metal for any given trench and via dimensions.
Abstract:
A single-wafer, chemical vapor deposition reactor is provided with hydrogen and silicon source gas suitable for epitaxial silicon deposition, as well as a safe mixture of oxygen in a non-reactive gas. Methods are provided for forming oxide and silicon layers within the same chamber. In particular, a sacrificial oxidation is performed, followed by a hydrogen bake to sublime the oxide and leave a clean substrate. Epitaxial deposition can follow in situ. A protective oxide can also be formed over the epitaxial layer within the same chamber, preventing contamination of the critical epitaxial layer. Alternatively, the oxide layer can serve as the gate dielectric, and a polysilicon gate layer can be formed in situ over the oxide.
Abstract:
A method is proposed for improving the adhesion between a diffusion barrier film and a metal film. Both the diffusion barrier film and the metal film can be deposited in either sequence onto a semiconductor substrate. A substrate comprising a first film, which is one of a diffusion barrier film or a metal film, with the first film being exposed at least at part of the surface area of the substrate, is exposed to an oxygen-containing reactant to create a surface termination of about one monolayer of oxygen-containing groups or oxygen atoms on the exposed parts of the first film. Then the second film, which is the other one of a diffusion barrier film and a metal film, is deposited onto the substrate. Furthermore, an oxygen bridge structure is proposed, the structure comprising a diffusion barrier film and a metal film having an interface with the diffusion barrier film, wherein the interface comprises a monolayer of oxygen atoms.
Abstract:
Thin, smooth silicon-containing films are prepared by deposition methods that utilize a silicon containing precursor. In preferred embodiments, the methods result in Si-containing films that are continuous and have a thickness of about 150 Å or less, a surface roughness of about 5 Å rms or less, and a thickness non-uniformity of about 20% or less. Preferred silicon-containing films display a high degree of compositional uniformity when doped or alloyed with other elements. Preferred deposition methods provide improved manufacturing efficiency and can be used to make various useful structures such as wetting layers, HSG silicon, quantum dots, dielectric layers, anti-reflective coatings (ARC's), gate electrodes and diffusion sources.
Abstract:
Thin, smooth silicon-containing films are prepared by deposition methods that utilize a silicon-containing precursor. In preferred embodiments, the methods result in Si-containing films that are continuous and have a thickness of about 150 Å or less, a surface roughness of about 5 Å rms or less, and a thickness non-uniformity of about 20% or less. Preferred silicon-containing films display a high degree of compositional uniformity when doped or alloyed with other elements. Preferred deposition methods provide improved manufacturing efficiency and can be used to make various useful structures such as wetting layers, HSG silicon, quantum dots, dielectric layers, anti-reflective coatings (ARC's), gate electrodes and diffusion sources.
Abstract:
Methods and apparatuses are provided for cooling semiconductor substrates prior to handling. In one embodiment, a substrate and support structure combination is lifted after high temperature processing to a cold wall of a thermal processing chamber, which acts as a heat sink. Conductive heat transfer across a small gap from the substrate to the heat sink speeds wafer cooling prior to handling the wafer (e.g., with a robot). In another embodiment, a separate plate is kept cool within a pocket during processing, and is moved close to the substrate and support after processing. In yet another embodiment, a cooling station between a processing chamber and a storage cassette includes two movable cold plates, which are movable to positions closely spaced on either side of the wafer.