摘要:
A method of forming a trench isolation (e.g., an STI) for an integrated circuit includes forming a pad oxide layer and then a nitride layer over a semiconductor substrate, performing a trench etch through the structure to form a trench, depositing a trench oxide layer over the structure to form a filled trench, depositing a sacrificial planarizing layer, which is etch-selective to the trench oxide layer, over the deposited oxide, performing a planarizing etch process that removes the sacrificial planarizing layer and decreases surface variations in an upper surface of the trench oxide layer, performing an oxide etch process that is selective to the trench oxide layer to remove remaining portions of the trench oxide layer outside the filled trench, and removing the remaining nitride layer such that the remaining oxide-filled trench defines a trench isolation structure that projects above an exposed upper surface of the semiconductor substrate.
摘要:
Techniques are disclosed for forming transistors on the same substrate with varied channel materials. The techniques include forming a replacement material region in the substrate, such region used to form a plurality of fins therefrom, the fins used to form transistor channel regions. In an example case, the substrate may comprise Si and the replacement materials may include Ge, SiGe, and/or at least one III-V material. The replacement material regions can have a width sufficient to ensure a substantially planar interface between the replacement material and the substrate material. Therefore, the fins formed from the replacement material regions can also have a substantially planar interface between the replacement material and the substrate material. One example benefit from being able to form replacement material channel regions with such substantially planar interfaces can include at least a 30 percent improvement in current flow at a fixed voltage.
摘要:
Techniques are disclosed for improved integration of germanium (Ge)-rich p-MOS source/drain contacts to, for example, reduce contact resistance. The techniques include depositing the p-type Ge-rich layer directly on a silicon (Si) surface in the contact trench location, because Si surfaces are favorable for deposition of high quality conductive Ge-rich materials. In one example method, the Ge-rich layer is deposited on a surface of the Si substrate in the source/drain contact trench locations, after removing a sacrificial silicon germanium (SiGe) layer previously deposited in the source/drain locations. In another example method, the Ge-rich layer is deposited on a Si cladding layer in the contact trench locations, where the Si cladding layer is deposited on a functional p-type SiGe layer. In some cases, the Ge-rich layer comprises at least 50% Ge (and may contain tin (Sn) and/or Si) and is boron (B) doped at levels above 1E20 cm -3 .
摘要:
Self-aligned gate edge and local interconnect structures and methods of fabricating self-aligned gate edge and local interconnect structures are described. In an example, a semiconductor structure includes a semiconductor fin disposed above a substrate and having a length in a first direction. A gate structure is disposed over the semiconductor fin, the gate structure having a first end opposite a second end in a second direction, orthogonal to the first direction. A pair of gate edge isolation structures is centered with the semiconductor fin. A first of the pair of gate edge isolation structures is disposed directly adjacent to the first end of the gate structure, and a second of the pair of gate edge isolation structures is disposed directly adjacent to the second end of the gate structure.
摘要:
Embodiments disclosed in the detailed description include metal oxide semiconductor (MOS) isolation schemes with continuous active areas separated by dummy gates. A MOS device includes an active area formed from a material with a work function that is described as either an n-metal or a p-metal. Active components are formed on this active area using materials having a similar work function. Isolation is effectuated by positioning a dummy gate between the active components. The dummy gate is made from a material having an opposite work function relative to the material of the active area. For example, if the active area was a p-metal material, the dummy gate would be made from an n-metal, and vice versa.
摘要:
Methods and apparatuses relate to implanting a surface of a semiconductor substrate with dopants, making undoped semiconductor material directly on the surface implanted with the dopants, and making a transistor with a transistor channel in the undoped semiconductor material, such that the transistor channel of the transistor remains undoped throughout manufacture of the integrated circuit.
摘要:
In one embodiment a method is provided that includes providing a structure including a semiconductor substrate (12) having at least one device region (14) located therein, and a doped semiconductor layer located on an upper surface of the semiconductor substrate in the at least one device region. After providing the structure, a sacrificial gate region (28) having a spacer (34) located on sidewalls thereof is formed on an upper surface of the doped semiconductor layer. A planarizing dielectric material (36) is then formed and the sacrificial gate region (28) is removed to form an opening (38) that exposes a portion of the doped semiconductor layer. The opening is extended to an upper surface of the semiconductor substrate (20) and then an anneal is performed that causes outdiffusion of dopant from remaining portions of the doped semiconductor layer forming a source region (40) and a drain region (42) in portions of the semiconductor substrate that are located beneath the remaining portions of the doped semiconductor layer. A high k gate dielectric (46) and a metal gate (48) are then formed into the extended opening.