Abstract:
One method disclosed herein includes forming a patterned mask layer above a surface of a semiconductor substrate, performing at least one etching process through the patterned mask layer to define a plurality of intersecting ridges that define a ridged surface in the substrate, and forming a Group III-V material on the ridged surface of the substrate. An illustrative device disclosed herein includes a Group IV substrate having a ridged surface comprised of a plurality of intersecting ridges and a Group III-V material layer positioned on the ridged surface of the Group IV substrate.
Abstract:
Methods for fabricating integrated circuits are provided in various exemplary embodiments. In one embodiment, a method for fabricating an integrated circuit includes providing a germanium-based semiconductor substrate comprising a GeOx layer formed thereon and exposing the semiconductor substrate to first and second atomic layer deposition (ALD) processes. The first ALD process includes exposing the semiconductor substrate to a first gaseous precursor comprising aluminum and exposing the semiconductor substrate to a second gaseous precursor comprising a first oxygen-containing precursor. The second ALD process includes exposing the semiconductor substrate to a first gaseous precursor comprising aluminum and exposing the semiconductor substrate to a second gaseous precursor comprising a second oxygen-containing precursor.
Abstract:
Methods for fabricating integrated circuits are provided in various exemplary embodiments. In one embodiment, a method for fabricating an integrated circuit includes providing a germanium-based semiconductor substrate comprising a GeOx layer formed thereon having a first thickness, removing a portion of the GeOx layer by exposing the semiconductor substrate to a hydrogen-plasma dry etch so as to reduce the first thickness of the GeOx layer to a second thickness, and depositing a high-k material over the GeOx layer of the semiconductor substrate.
Abstract:
A method of forming a metal semiconductor alloy that includes forming an intermixed metal semiconductor region to a first depth of a semiconductor substrate without thermal diffusion. The intermixed metal semiconductor region is annealed to form a textured metal semiconductor alloy. A second metal layer is formed on the textured metal semiconductor alloy. The second metal layer on the textured metal semiconductor alloy is then annealed to form a metal semiconductor alloy contact, in which metal elements from the second metal layer are diffused through the textured metal semiconductor alloy to provide a templated metal semiconductor alloy. The templated metal semiconductor alloy includes a grain size that is greater than 2× for the metal semiconductor alloy, which has a thickness ranging from 15 nm to 50 nm.
Abstract:
Metal-insulator-semiconductor (MIS) contacts for germanium and its alloys include insulator layers of oxygen-deficient metal oxide deposited by atomic layer deposition (ALD). The oxygen deficiency reduces the tunnel barrier resistance of the insulator layer while maintaining the layer's ability to prevent Fermi-level pinning at the metal/semiconductor interface. The oxygen deficiency is controlled by optimizing one or more ALD parameters such as shortened oxidant pulses, use of less-reactive oxidants such as water, heating the substrate during deposition, TMA “cleaning” of native oxide before deposition, and annealing after deposition. Secondary factors include reduced process-chamber pressure, cooled oxidant, and shortened pulses of the metal precursor.
Abstract:
Methods for fabricating integrated circuits are provided in various exemplary embodiments. In one embodiment, a method for fabricating an integrated circuit includes providing a germanium-based semiconductor substrate including a GeOx layer formed thereon having a first thickness, removing a portion of the GeOx layer by exposing the semiconductor substrate to a NF3/NH3 plasma dry etch so as to reduce the first thickness of the GeOx layer to a second thickness, and depositing a high-k material over the GeOx layer of the semiconductor substrate.
Abstract:
A method of forming a metal semiconductor alloy that includes forming an intermixed metal semiconductor region to a first depth of a semiconductor substrate without thermal diffusion. The intermixed metal semiconductor region is annealed to form a textured metal semiconductor alloy. A second metal layer is formed on the textured metal semiconductor alloy. The second metal layer on the textured metal semiconductor alloy is then annealed to form a metal semiconductor alloy contact, in which metal elements from the second metal layer are diffused through the textured metal semiconductor alloy to provide a templated metal semiconductor alloy. The templated metal semiconductor alloy includes a grain size that is greater than 2× for the metal semiconductor alloy, which has a thickness ranging from 15 nm to 50 nm.
Abstract:
A short channel semiconductor device is formed with halo regions that are separated from the bottom of the gate electrode and from each other. Embodiments include implanting halo regions after forming source/drain regions and source/drain extension regions. An embodiment includes forming source/drain extension regions in a substrate, forming source/drain regions in the substrate, forming halo regions under the source/drain extension regions, after forming the source drain regions, and forming a gate electrode on the substrate between the source/drain regions. By forming the halo regions after the high temperature processing involved informing the source/drain and source/drain extension regions, halo diffusion is minimized, thereby maintaining sufficient distance between halo regions and reducing short channel NMOS Vt roll-off.
Abstract:
Apparatus for semiconductor device structures and related fabrication methods are provided. One method for fabricating a semiconductor device structure involves forming a gate structure overlying a region of semiconductor material, wherein the width of the gate structure is aligned with a crystal direction of the semiconductor material. The method continues by forming recesses about the gate structure and forming a stress-inducing semiconductor material in the recesses.
Abstract:
Apparatus for semiconductor device structures and related fabrication methods are provided. One method for fabricating a semiconductor device structure involves forming a gate structure overlying a region of semiconductor material, wherein the width of the gate structure is aligned with a crystal direction of the semiconductor material. The method continues by forming recesses about the gate structure and forming a stress-inducing semiconductor material in the recesses.