Abstract:
An improved apparatus and method for substrate layer deposition in which substrate layers are grown by carrier gas delivery of sequential pulses of reactants to the substrate surface. At least one of the reactants comprises excited species, e.g., radicals. In a specific embodiment, the apparatus of this invention provides sequential repeated pulses of reactants in a flow of carrier gas for reaction at a substrate surface. The reactant pulses are delivered with sufficient intervening delay times to minimize undesirable reaction between reactants in adjacent pulses in the gas phase or undesired uncontrolled reactions on the substrate surface.
Abstract:
Methods for depositing epitaxial films such as epitaxial Ge and SiGe films. During cooling from high temperature processing to lower deposition temperatures for Ge-containing layers, Si or Ge compounds are provided to the substrate. Smooth, thin, relatively defect-free Ge or SiGe layers result. Retrograded relaxed SiGe is also provided between a relaxed, high Ge-content seed layer and an overlying strained layer.
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:
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:
Improvements in the design of a low mass wafer holder are disclosed. The improvements include the use of peripherally located, integral lips to space a wafer or other substrate above the base plate of the wafer holder. A uniform gap is thus provided between the wafer and the base plate, such as will temper rapid heat exchanges, allow gas to flow between the wafer and wafer holder during wafer pick-up, and keep the wafer holder thermally coupled with the wafer. At the same time, thermal disturbance from lip contact with the wafer is reduced. Gas flow during pick-up can be provided through radial channels in a wafer holder upper surface, or through backside gas passages. A thicker ring is provided at the wafer holder perimeter, and is provided in some embodiments as an independent piece to accommodate stresses accompanying thermal gradients. Self-centering mechanisms are provided to keep the wafer holder centered relative to a spider which is subject to differential thermal expansion.
Abstract:
Various reactors for growing thin films on a substrate by subjecting the substrate to alternately repeated surface reactions of vapor-phase reactants are disclosed. In one embodiment, the reactor comprises a reaction chamber. A showerhead plate divides the reaction chamber into upper and lower parts. A first precursor is directed towards the lower half of the reaction chamber and a second precursor is directed towards the upper half of the reaction chamber. The substrate is disposed within the lower half of the reaction chamber. The showerhead plate includes plurality passages such that the upper half is in communication with the lower half of the reaction chamber. In another arrangement, the upper half of the reaction chamber defines a plasma cavity in which in-situ radicals are formed. In yet another arrangement, the reaction chamber includes a shutter plate, which is configured to selectively open and close the passages in the showerhead plate. In other arrangements, the showerhead plate is arranged to modify the local flow patterns of the gases flowing through the reaction chamber.
Abstract:
Methods for depositing epitaxial films such as epitaxial Ge and SiGe films. During cooling from high temperature processing to lower deposition temperatures for Ge-containing layers, Si or Ge compounds are provided to the substrate. Smooth, thin, relatively defect-free Ge or SiGe layers result. Retrograded relaxed SiGe is also provided between a relaxed, high Ge-content seed layer and an overlying strained layer.
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 method of removing deposits from selected areas of a substrate-processing chamber comprising applying RF energy to a coil located around selected areas of the chamber is provided. Also provided is a substrate-processing chamber with improved cleaning properties having a coil capable of being coupled with an RF field disposed at selected areas of the chamber.
Abstract:
Multiple sequential processes are conducted in situ in a single-wafer processing chamber, particularly for forming ultrathin dielectric stacks of high quality. The chamber exhibits single-pass, laminar gas flow, facilitating safe and clean sequential processing. Furthermore, a remote plasma source widens process windows, permitting isothermal sequential processing and thereby reducing the transition time for temperature ramping between in situ steps. In exemplary processes, extremely thin interfacial silicon oxide, nitride and/or oxynitride is grown, followed by in situ silicon nitride deposition. Cleaning, anneal and electrode deposition can also be conducted in situ, reducing transition time without commensurate loss in reaction rates.