摘要:
Disclosed is a semiconductor device having a p-n junction with reduced junction leakage in the presence of metal silicide defects that extend to the junction and a method of forming the device. Specifically, a semiconductor layer having a p-n junction is formed. A metal silicide layer is formed on the semiconductor layer and a dopant is implanted into the metal silicide layer. An anneal process is performed causing the dopant to migrate toward the metal silicide-semiconductor layer interface such that the peak concentration of the dopant will be within a portion of the metal silicide layer bordering the metal silicide-semiconductor layer interface and encompassing the defects. As a result, the silicide to silicon contact is effectively engineered to increase the Schottky barrier height at the defect, which in turn drastically reduces any leakage that would otherwise occur, when the p-n junction is in reverse polarity.
摘要:
The present invention provides a method for forming a self-aligned Ni alloy silicide contact. The method of the present invention begins by first depositing a conductive Ni alloy with Pt and optionally at least one of the following metals Pd, Rh, Ti, V, Cr, Zr, Nb, Mo, Hf, Ta, W or Re over an entire semiconductor structure which includes at least one gate stack region. An oxygen diffusion barrier comprising, for example, Ti, TiN or W is deposited over the structure to prevent oxidation of the metals. An annealing step is then employed to cause formation of a NiSi, PtSi contact in regions in which the metals are in contact with silicon. The metal that is in direct contact with insulating material such as SiO2 and Si3N4 is not converted into a metal alloy silicide contact during the annealing step A. selective etching step is then performed to remove unreacted metal from the sidewalls of the spacers and trench isolation regions.
摘要:
Electronic devices having carbon-based materials and techniques for making contact to carbon-based materials in electronic devices are provided. In one aspect, a device is provided having a carbon-based material; and at least one electrical contact to the carbon-based material comprising a metal silicide, germanide or germanosilicide. The carbon-based material can include graphene or carbon nano-tubes. The device can further include a segregation region, having an impurity, separating the carbon-based material from the metal silicide, germanide or germanosilicide, wherein the impurity has a work function that is different from a work function of the metal silicide, germanide or germanosilicide. A method for fabricating the device is also provided.
摘要:
The present invention relates to a method for forming self-aligned metal silicide contacts over at least two silicon-containing semiconductor regions that are spaced apart from each other by an exposed dielectric region. Preferably, each of the self-aligned metal silicide contacts so formed comprises at least nickel silicide and platinum silicide with a substantially smooth surface, and the exposed dielectric region is essentially free of metal and metal silicide. More preferably, the method comprises the steps of nickel or nickel alloy deposition, low-temperature annealing, nickel etching, high-temperature annealing, and aqua regia etching.
摘要:
In one embodiment, a method of forming a semiconductor device is provided that includes providing a gate structure on a semiconductor substrate. Sidewall spacers may be formed adjacent to the gate structure. A metal semiconductor alloy may be formed on the upper surface of the gate structure and on an exposed surface of the semiconductor substrate that is adjacent to the gate structure. An upper surface of the metal semiconductor alloy is converted to an oxygen-containing protective layer. The sidewall spacers are removed using an etch that is selective to the oxygen-containing protective layer. A strain-inducing layer is formed over the gate structure and the semiconductor surface, in which at least a portion of the strain-inducing layer is in direct contact with the sidewall surface of the gate structure. In another embodiment, the oxygen-containing protective layer of the metal semiconductor alloy is provided by a two stage annealing process.
摘要:
A method for forming a single, few-layer, or multi-layer graphene and structure is described incorporating selecting a substrate having a buried layer of carbon underneath a metal layer, providing an ambient and providing a heat treatment to pass carbon through the metal layer to form a graphene layer on the metal layer surface or incorporating a metal-carbon layer which is heated to segregate carbon in the form of graphene to the surface or chemically reacting the metal in the metal-carbon layer with a substrate containing Si driving the carbon to the surface whereby graphene is formed.
摘要:
Embodiments of the invention provide a semiconductor device including a collector in an active region; a first and a second sub-collector, the first sub-collector being a heavily doped semiconductor material adjacent to the collector and the second sub-collector being a silicided sub-collector next to the first sub-collector; and a silicided reach-through in contact with the second sub-collector, wherein the first and second sub-collectors and the silicided reach-through provide a continuous conductive pathway for electrical charges collected by the collector from the active region. Embodiments of the invention also provide methods of fabricating the same.
摘要:
An interconnection structure suitable for flip-chip attachment of microelectronic device chips to packages, comprising a two, three or four layer ball-limiting metallurgy including an adhesion/reaction barrier layer, and having a solder wettable layer reactive with components of a tin-containing lead free solder, so that the solderable layer can be totally consumed during soldering, but a barrier layer remains after being placed in contact with the lead free solder during soldering. One or more lead-free solder balls is selectively situated on the solder wetting layer, the lead-free solder balls comprising tin as a predominant component and one or more alloying components.
摘要:
The present invention relates to a method for forming self-aligned metal silicide contacts over at least two silicon-containing semiconductor regions that are spaced apart from each other by an exposed dielectric region. Preferably, each of the self-aligned metal silicide contacts so formed comprises at least nickel silicide and platinum silicide with a substantially smooth surface, and the exposed dielectric region is essentially free of metal and metal silicide. More preferably, the method comprises the steps of nickel or nickel alloy deposition, low-temperature annealing, nickel etching, high-temperature annealing, and aqua regia etching.
摘要:
A complementary metal oxide semiconductor (CMOS) device, e.g., a field effect transistor (FET), that includes at least one one-dimensional nanostructure that is typically a carbon-based nanomaterial, as the device channel, and a metal carbide contact that is self-aligned with the gate region of the device is described. The present invention also provides a method of fabricating such a CMOS device.