摘要:
A method for making a semiconductor device is described. That method comprises forming a first dielectric layer on a substrate, a trench within the first dielectric layer, and a second dielectric layer on the substrate. The second dielectric layer has a first part that is formed in the trench and a second part. After a first metal layer with a first workfunction is formed on the first and second parts of the second dielectric layer, part of the first metal layer is converted into a second metal layer with a second workfunction.
摘要:
Replacement metal gates may be formed by removing a polysilicon layer from a gate structure. The gate structure may be formed by patterning the polysilicon layer and depositing a spacer layer over the gate structure such that the spacer layer has a first polish rate. The spacer layer is then etched to form a sidewall spacer. An interlayer dielectric is applied over the gate structure with the sidewall spacer. The interlayer dielectric has a second polish rate higher than the first polish rate. In one embodiment, the interlayer dielectric has a lower polish rate than that of oxide.
摘要:
In a metal gate replacement process, a stack of at least two polysilicon layers or other materials may be formed. Sidewall spacers may be formed on the stack. The stack may then be planarized. Next, the upper layer of the stack may be selectively removed. Then, the exposed portions of the sidewall spacers may be selectively removed. Finally, the lower portion of the stack may be removed to form a T-shaped trench which may be filled with the metal replacement.
摘要:
Increasing the number of successive pulses of oxidant before applying pulses of metal precursor may improve the quality of the resulting metal or rare earth oxide films. These metal or rare earth oxide films may be utilized for high dielectric constant gate dielectrics. In addition, pulsing the oxidant during the pre-stabilization period may be advantageous. Also, using more pulses of oxidant than the pulses of precursor may reduce chlorine concentration in the resulting films.
摘要:
A metal gate transistor may include a metal layer over a high dielectric constant dielectric layer. The dielectric layer abstracts electronegativity from said metal layer, altering its workfunction. The workfunction of the metal layer may be set to compensate for the dielectric layer abstraction.
摘要:
A method for making a semiconductor device is described. That method comprises forming a dielectric layer on a substrate, forming a trench within the dielectric layer, and forming a high-k gate dielectric layer within the trench. After forming a first metal layer on the high-k gate dielectric layer, a second metal layer is formed on the first metal layer. At least part of the second metal layer is removed from above the dielectric layer using a polishing step, and additional material is removed from above the dielectric layer using an etch step.
摘要:
A method for making a semiconductor device is described. That method comprises modifying a first surface, and forming a high-k gate dielectric layer on an unmodified second surface.
摘要:
A method for making a semiconductor device is described. That method comprises forming on a substrate a first gate dielectric layer that has a first substantially vertical component, then forming a first metal layer on the first gate dielectric layer. After forming on the substrate a second gate dielectric layer that has a second substantially vertical component, a second metal layer is formed on the second gate dielectric layer. In this method, a conductor is formed that contacts both the first metal layer and the second metal layer.
摘要:
Semiconductor integrated circuit structures, such as stacks containing metal layers, may be etched with a modified viscosity etchant. An increased viscosity etchant, for example, may reduce undercutting when a metal film is being etched.
摘要:
A semiconductor device and a method for forming it are described. The semiconductor device comprises a metal NMOS gate electrode that is formed on a first part of a substrate, and a silicide PMOS gate electrode that is formed on a second part of the substrate.