Abstract:
A sub-0.1 mu m MOSFET device having minimum poly depletion, silicided source and drain junctions and very low sheet resistance poly-gates is provided utilizing a damascene- gate process wherein the source and drain implantation activation annealing and silicidation occurs in the presence of a dummy gate region which is thereafter removed and replaced with a polysilicon gate region.
Abstract:
A method is provided for forming a capping layer for a semiconductor structure including a silicide-forming metal (2) overlying silicon (1). According to the invention, a layer of nitride (51) is formed overlying the semiconductor structure and in contact with the silicide-forming metal (2). This layer is formed by sputtering form a target in an ambient characterized by a nitrogen flow less than about 45 sccm. The layer is therefore deficient in nitrogen, so that formation of an oxynitride at a native oxide layer (11) on the silicon is avoided and diffusion between the silicon (1) and the metal (2) is not inhibited.
Abstract:
PROBLEM TO BE SOLVED: To provide a sub 0.1 μm MOSFET device wherein depletion of polysilicon is minimum, a source junction and a drain junction of silicide are comprised, and a sheet resistance of a poly gate is very low. SOLUTION: A damascen gate process is used wherein, with a dummy gate region provided, the injection/activation annealing and siliciding of a source and drain are performed, and then the dummy gate region is removed and replaced with a polysilicon gate region. Thus, a high-performance sub 0.1 μm MOSFET device is provided in which the sheet resistance of the poly gate is 5 Ω/(square) or below.
Abstract:
PROBLEM TO BE SOLVED: To prevent deep quenching/encroachment into a silicon region, insufficient attachment, uncontrolled selectivity and irregular structure by reacting fire-resistant halogenide with an exposed surface of a silicon substrate and then reacting it with silicon containing gas and reacting it with hydrogen. SOLUTION: A preliminary adjusted wafer 10 is arranged on a heater base 22 with an electric field through 11 in a fire-resistant gas CVD reactor 20. Gas is supplied from gas supply sources 26, 28, 30, 32, 34 to a shower head 24 and gas 40 is also supplied to a rear. Here, fire-resistant metallic halogenide is reacted with a silicon substrate exposed surface in the existence of inert gas and fire-resistant metal is selectively attached to a silicon substrate exposed surface. Then, fire-resistant metallic halogenide is reacted with silicon containing gas, silicon substrate quenching is limited by fire-resistant metallic halogenide and a thickness of fire-resistant meal is increased. Furthermore, fire-resistant metallic halogenide is reacted with hydrogen and fire-resistant metal is further deposited.
Abstract:
A sub-0.1 mum MOSFET device having minimum poly depletion, salicided source and drain junctions and very low sheet resistance poly-gates is provided utilizing a damascene-gate process wherein the source and drain implantation activation annealing and silicidation occurs in the presence of a dummy gate region which is thereafter removed and replaced with a polysilicon gate region.
Abstract:
A sub-0.1 mum MOSFET device having minimum poly depletion, salicided source and drain junctions and very low sheet resistance poly-gates is provided utilizing a damascene-gate process wherein the source and drain implantation activation annealing and silicidation occurs in the presence of a dummy gate region which is thereafter removed and replaced with a polysilicon gate region.
Abstract:
A MOSFET device is formed on a P- doped semiconductor substrate with an N- well formed therein, with a pair of isolation regions formed in the N- well with a gate oxide layer formed above the N- well. An FET device is formed with source and drain regions within the N-well, and a gate electrode formed above the gate oxide layer aligned with the source and drain regions. The gate electrode comprises a stack of layers. A polysilicon layer is formed on the gate oxide layer. A tungsten nitride dopant barrier layer is formed upon the polysilicon layer having a thickness of from about 5 nm to about 20 nm, and a tungsten silicide layer is formed upon the tungsten nitride layer.