Abstract:
A barrier layer and a fabrication thereof are disclosed. The barrier layer comprises at least one barrier material selected from the group consisting of Ta, W, Ti, Ru, Zr, Hf, V, Nb, Cr and Mo and at least one component of oxygen, nitrogen or carbon. A ratio of the component to the barrier material is not less than about 0.45. The fabrication method of the barrier layer applies a working pressure for forming the barrier layer from about 0.5 mTorr to about 200 mTorr substantially without forming crystalline material therein.
Abstract:
A common problem associated with damascene structures made of copper inlaid in FSG (fluorinated silicate glass) is the formation of defects near the top surface of the structure. The present invention avoids this problem by laying down a layer of USG (undoped silicate glass) over the surface of the FSG layer prior to patterning and etching the latter to form the via hole and (for a dual damascene structure) the trench. After over-filling with copper, the structure is planarized using CMP. The USG layer acts both to prevent any fluorine from the FSG layer from reaching the copper and as an end-point detector during CMP. In this way defects that result from copper-fluorine interaction do not form and precise planarization is achieved.
Abstract:
An integrated apparatus comprises a plasma etching station, a wet cleaning station, a de-gassing station, a thin film deposition station, and a wafer transfer mechanism to automatically index wafers between the stations in a predetermined processing order.
Abstract:
A semiconductor device and fabrication thereof. An opening is formed in a first dielectric layer, exposing an active region of the transistor, and an atomic layer deposited (ALD) TaN barrier is conformably formed in the opening, at a thickness less than 20 Å. A copper layer is formed over the atomic layer deposited (ALD) TaN barrier to fill the opening.
Abstract:
A system and method for providing a passivation structure for semiconductor devices is provided. In an embodiment, the passivation structure comprises a first barrier layer and a second barrier layer, wherein the second barrier layer may comprise a material, such as cobalt and/or nickel, that is less pure than the first barrier layer. In another embodiment, a single gradient barrier layer is formed. In this embodiment the single gradient barrier layer exhibits a greater pure conductive material, such as cobalt and/or nickel, nearer the conductive line than near the surface.
Abstract:
A semiconductor diffusion barrier layer and its method of manufacture is described. The barrier layer includes of at least one layer of TaN, TiN, WN, TbN, VN, ZrN, CrN, WC, WN, WCN, NbN, AlN, and combinations thereof. The barrier layer may further include a metal rich surface. Embodiments preferably include a glue layer about 10 to 500 Angstroms thick, the glue layer consisting of Ru, Ta, Ti, W, Co, Ni, Al, Nb, AlCu, and a metal-rich nitride, and combinations thereof. The ratio of the glue layer thickness to the barrier layer thickness is preferably about 1 to 50. Other alternative preferred embodiments further include a conductor annealing step. The various layers may be deposited using PVD, CVD, PECVD, PEALD and/or ALD methods including nitridation and silicidation methods.
Abstract:
A method of forming a silicided gate of a field effect transistor on a substrate having active regions is provided. The method includes the following steps: (a) forming a silicide in at least a first portion of a gate; (b) after step (a), depositing a metal over the active regions and said gate; and (c) annealing to cause the metal to react to form silicide in the active regions, wherein the thickness of said gate silicide is greater than the thickness of said silicide in said active regions.
Abstract:
A damascene structure for semiconductor devices is provided. In an embodiment, the damascene structure includes trenches formed over vias that electrically couple the trenches to an underlying conductive layer such that the trenches have varying widths. The vias are lined with a first barrier layer. The first barrier layers along the bottom of vias are removed such that a recess formed in the underlying conductive layer. The recesses formed along the bottom of vias are such that the recess below narrower trenches is greater than the recess formed below wider trenches. In another embodiment, a second barrier layer may then be formed over the first barrier layer. In this embodiment, a portion of the conductive layer may be interposed between the first barrier layer and the second barrier layer.
Abstract:
A copper filled damascene structure and method for forming the same the method including providing a substrate comprising a semiconductor substrate; forming an insulator layer on the substrate; forming a damascene opening through a thickness portion of the insulator layer; forming a diffusion barrier layer to line the damascene opening; forming a first seed layer overlying the diffusion barrier; plasma treating the first seed layer in-situ with a first treatment plasma comprising plasma source gases selected from the group consisting of argon, nitrogen, hydrogen, and NH3; forming a second seed layer overlying the first seed layer; forming a copper layer overlying the second seed layer according to an electro-chemical plating (ECP) process to fill the damascene opening; and, planarizing the copper layer to form a metal interconnect structure.
Abstract:
A new method is provided for the creation of a barrier-free copper interconnect. A dual damascene structure is created in a layer of dielectric, a thin metal barrier layer is deposited. The metal barrier layer is oxidized, two layers are then deposited with the first layer comprising doped copper and the second layer comprising pure copper. The dual damascene structure is filled with copper, a thermal anneal is applied, stabilizing the deposited copper filling the dual damascene structure and forming metal oxide of the doped minority element. Excess copper is then removed from the dielectric.