Abstract:
A fully silicided gate with a selectable work function includes; a gate dielectric over the substrate; and a first metal silicide layer over the gate dielectric, and a second metal silicide layer wherein the first metal silicide has a different phase then the second metal silicide layer. The metal silicide layers comprises at least one alloy element. The concentration of the alloy element on the interface between the gate dielectric and the metal silicide layers influence the work function of the gate.
Abstract:
A layer of P-metal material having a work function of about 4.3 or 4.4 eV or less is formed over a high-k dielectric layer. Portions of the N-metal layer are converted to P-metal materials by introducing additives such as O, C, N, Si or others to produce a P-metal material having an increased work function of about 4.7 or 4.8 eV or greater. A TaC film may be converted to a material of TaCO, TaCN, or TaCON using this technique. The layer of material including original N-metal portions and converted P-metal portions is then patterned using a single patterning operation to simultaneously form semiconductor devices from both the unconverted N-metal sections and converted P-metal sections.
Abstract:
A method for forming nickel silicide includes degassing a semiconductor substrate that includes a silicon surface. After the degassing operation, the substrate is cooled prior to a metal deposition process, during a metal deposition process, or both. The cooling suppresses the temperature of the substrate to a temperature less than the temperature required for the formation of nickel silicide. Nickel diffusion is minimized during the deposition process. After deposition, an annealing process is used to urge the formation of a uniform silicide film. In various embodiments, the metal film may include a binary phase alloy containing nickel and a further element.
Abstract:
A method of forming a silicided gate on a substrate having active regions, comprising the steps of: forming a first silicide in the active regions from a first material; and forming a second silicide in the gate from a second material, wherein the first silicide forms a barrier against the second material forming a silicide in the active regions during the second silicide forming step, wherein said second silicide is thicker than said first silicide.
Abstract:
A method of forming a silicided gate on a substrate having active regions, comprising the steps of: forming a first silicide in the active regions from a first material; and forming a second silicide in the gate from a second material, wherein the first silicide forms a barrier against the second material forming a silicide in the active regions during the second silicide forming step, wherein said second silicide is thicker than said first silicide.
Abstract:
A method for fabricating a microelectronic layer. There is first provided a substrate. There is then formed over the substrate a target layer. There is then formed upon the target layer a patterned photoresist layer which defines a first aperture, where the first aperture has a first aperture width which exposes a first portion of the target layer. There is then reflowed thermally the patterned photoresist layer to form a reflowed patterned photoresist layer which defines a substantially straight sided second aperture. The second aperture has a second aperture width less than the first aperture width, and the second aperture thus exposes a second portion of the blanket target layer of areal dimension less than the first portion of the blanket target layer. Finally, there is then fabricated the target layer to form a fabricated target layer while employing the reflowed patterned photoresist layer as a mask layer. The method is useful insofar as it allows the target layer to be fabricated while avoiding the use of advanced microelectronic fabrication photolithographic tooling when forming the patterned photoresist layer.
Abstract:
A method for forming silicided shallow junctions, wherein impurities are implanted into a silicon layer formed over a silicon substrate. A metal layer selected from one of platinum (Pt), palladium (Pd), nickel (Ni) and cobalt (Co) is deposited over the silicon layer. At least one low temperature annealing process is carried out to form a silicide layer as well as the shallow junctions. Pre-anneal of the silicon layer and post-anneal of the silicide between 450.degree. and 600.degree. C. are also employed.