摘要:
A semiconductor device has a gate with three conductive layers over a high K gate dielectric. The first layer is substantially oxygen free. The work function is modulated to the desired work function by a second conductive layer in response to subsequent thermal processing. The second layer is a conductive oxygen-bearing metal. With sufficient thickness of the first layer, there is minimal penetration of oxygen from the second layer through the first layer to adversely impact the gate dielectric but sufficient penetration of oxygen to change the work function to a more desirable level. A third layer, which is metallic, is deposited over the second layer. A polysilicon layer is deposited over the third layer. The third layer prevents the polysilicon layer and the oxygen-bearing layer from reacting together.
摘要:
A semiconductor device structure is formed over a semiconductor substrate and has a gate dielectric over the semiconductor substrate and a gate over the gate dielectric. The gate, at an interface with the gate dielectric, comprises a transition metal, carbon, and an electropositive element. The transition metal comprises one of group consisting of tantalum, titanium, hafnium, zirconium, molybdenum, and tungsten. The electropositive element comprises one of a group consisting of a Group IIA element, a Group IIIB element, and lanthanide series element.
摘要:
A semiconductor device has a gate with three conductive layers over a high K gate dielectric. The first layer is substantially oxygen free. The work function is modulated to the desired work function by a second conductive layer in response to subsequent thermal processing. The second layer is a conductive oxygen-bearing metal. With sufficient thickness of the first layer, there is minimal penetration of oxygen from the second layer through the first layer to adversely impact the gate dielectric but sufficient penetration of oxygen to change the work function to a more desirable level. A third layer, which is metallic, is deposited over the second layer. A polysilicon layer is deposited over the third layer. The third layer prevents the polysilicon layer and the oxygen-bearing layer from reacting together.
摘要:
A semiconductor device structure is formed over a semiconductor substrate and has a gate dielectric over the semiconductor substrate and a gate over the gate dielectric. The gate, at an interface with the gate dielectric, comprises a transition metal, carbon, and an electropositive element. The transition metal comprises one of group consisting of tantalum, titanium, hafnium, zirconium, molybdenum, and tungsten. The electropositive element comprises one of a group consisting of a Group IIA element, a Group IIIB element, and lanthanide series element.
摘要:
A semiconductor process and apparatus fabricate a metal gate electrode by forming a first conductive layer (14) over a gate dielectric layer (12) and then selectively introducing nitrogen into the portions of the first conductive layer (14) in the PMOS device region (1), either by annealing (42) a nitrogen-containing diffusion layer (22) formed in the PMOS device region (1) or by performing an ammonia anneal process (82) while the NMOS device region (2) is masked. By introducing nitrogen into the first conductive layer (14), the work function is modulated toward PMOS band edge.
摘要:
A stack located over a substrate. The stack includes a layer between a dielectric layer and a metal layer. The layer includes a halogen and a metal. In one embodiment, the halogen is fluorine. In one embodiment, the stack is a control electrode stack for a transistor. In one example the control electrode stack is a gate stack for a MOSFET. In one example, the layer includes aluminum fluoride.
摘要:
A method including partially etching a first portion of a first layer, wherein the first layer is a conductive layer, is provided. The method further includes removing at least a portion of a second layer. The method further includes completing etching of said first portion of the conductive layer so that said first portion of the conductive layer is removed. The method further includes completing formation of the semiconductor device.
摘要:
A stack located over a substrate. The stack includes a layer between a dielectric layer and a metal layer. The layer includes a halogen and a metal. In one embodiment, the halogen is fluorine. In one embodiment, the stack is a control electrode stack for a transistor. In one example the control electrode stack is a gate stack for a MOSFET. In one example, the layer includes aluminum fluoride.
摘要:
A method for forming a semiconductor structure includes forming a channel region layer over a semiconductor layer where the semiconductor layer includes a first and a second well region, forming a protection layer over the channel region layer, forming a first gate dielectric layer over the first well region, forming a first metal gate electrode layer over the first gate dielectric, removing the protection layer, forming a second gate dielectric layer over the channel region layer, forming a second metal gate electrode layer over the second gate dielectric layer, and forming a first gate stack including a portion of each of the first gate dielectric layer and the first metal gate electrode layer over the first well region and forming a second gate stack including a portion of each of the second gate dielectric layer and the second metal gate electrode layer over the channel region layer.
摘要:
A method for forming a semiconductor structure includes forming a channel region layer over a semiconductor layer where the semiconductor layer includes a first and a second well region, forming a protection layer over the channel region layer, forming a first gate dielectric layer over the first well region, forming a first metal gate electrode layer over the first gate dielectric, removing the protection layer, forming a second gate dielectric layer over the channel region layer, forming a second metal gate electrode layer over the second gate dielectric layer, and forming a first gate stack including a portion of each of the first gate dielectric layer and the first metal gate electrode layer over the first well region and forming a second gate stack including a portion of each of the second gate dielectric layer and the second metal gate electrode layer over the channel region layer.