摘要:
A method for real-time detecting the thickness of a material layer. A reflected light is measured of an incident light emitted toward the material layer. By integrating the intensity of the reflected light along the time axis, followed by dividing by the product of the derivative of the intensity of the reflected light and the polishing time, an I-Dt transformation curve can be obtained. Since the I-Dt transformation curve has characteristics associated with a cosecant function, which has salient peaks on the curve, the thickness of the material layer can be real-time determined. Furthermore, due to the facts that the transformed curve has salient peaks, the function itself reveals the sign of the slope, and the transformed curve are relatively flat between peaks, correct and stable rules can therefore be provided to determine the analytical endpoint.
摘要:
A method for fabricating a shallow trench isolation (STI) structure is provided. The method contain sequentially forming a pad oxide layer, a hard layer, and a polysilicon layer on the substrate, all of which are patterned to form a trench in the substrate to define several active areas. The hard layer usually includes silicon nitride. An insulating layer is formed over the substrate so that the trench is also filled. A CMP process is performed to polish the insulating layer. The CMP process is continuously performed until the hard layer is completely exposed. The hard layer and the pad oxide layer are sequentially removed to form the STI structure.
摘要:
The present invention provides a method of fabricating a tungsten (W) plug 36 contact to a substrate using a selective W CVD Process with a self-aligned W-Silicide Barrier layer 34. The method comprises the steps of: forming first insulating layer 20 over a silicon semiconductor substrate 10; forming a first (contact) opening 24 in the first insulating layer 20 exposing the surface of the substrate; selectively growing a thin first tungsten layer 30 over the exposed substrate surface; rapidly thermally annealing the substrate forming a thin first tungsten silicide layer 34 from the thin first tungsten layer 30; selectively depositing a tungsten plug 36 over the first thin tungsten silicide layer 34 substantially filling the first opening 36 thereby forming a W plug contact. The RTA/W silicide layer 34 lowers the contact resistance, increases the adhesion and facilitates the selective deposition of the W plug 36.
摘要:
A method of determining a real time removal rate. A material layer is polished. During the polishing process, a light is incident onto the material layer continuously. The incident light is reflected from the material layer with a reflected light intensity. By integrating the reflected light intensity, followed by dividing the integration with a product of a differential of the reflected light intensity and the polishing time, an I-Dt transformation is obtained. The I-Dt transformation has a period which reflects the removal rate through calculation of optical principle.
摘要:
Multi-gate devices and methods of their fabrication are disclosed. A multi-gate device can include a gate structure and a plurality of fins. The gate structure envelops a plurality of surfaces of the fins, which are directly on a substrate that is composed of a semiconducting material. Each of the fins provides a channel between a respective source and a respective drain, is composed of the semiconducting material and is doped. A first fin of the plurality of fins has a first height that is different from a second height of a second fin of the plurality of fins such that drive currents of the first and second fins are different. Further, the first and second fins form a respective cohesive structure of the semiconducting material with the substrate. In addition, surfaces of the substrate that border the fins are disposed at a same vertical position.
摘要:
The problem of poor adherence of a dielectric coating on a patterned metal structure can be solved by forming an adhesion layer on exposed surfaces of such metal structure prior to deposition of such dielectric. According to an embodiment, the invention provides a method to form a self-aligned adhesion layer on the surface of metal interconnect structure within an integrated circuit by exposing the metal structure to a controlled atmosphere and a flow of nitrogen-containing gas.
摘要:
An improved electro-chemical deposition copper (ECD-Cu) apparatus and a method of preventing cavities in an ECD-Cu thin film are provided. The electro-chemical deposition apparatus has a bath tank, an anode positioned in the bath tank, and a spin plate for positioning a semiconductor wafer that is used as a cathode. The method, by alternating a spin direction of the spin plate between a clockwise direction and a counterclockwise direction, every 1 to 10 seconds, prevents an electrolyte solution of the bath tank from forming a stable vortex, and suppresses a phenomenon of forming cavities in the ECD-Cu thin film when bubbles of the vortex adhere to the wafer surface.
摘要:
A wiring structure with improved resistance to void formation and a method of making the same are described. The wiring structure has a first conducting layer that includes a large area portion which is connected to an end of a protrusion with a plurality of “n” overlapping segments and at least one bending portion. The other end of the protrusion is connected to the bottom of a via which has an overlying second conducting layer. A bend is formed by overlapping the ends of two adjacent segments at an angle between 45° and 135°. The protrusion may also include at least one extension at a segment end beyond a bend. A bending portion and extension are used as bottlenecks to delay the diffusion of a vacancy from the large area portion to the vicinity of the via and is especially effective for copper interconnects or in a via test structure.
摘要:
The present invention related to a CMP equipment, compatible with the existing manufacture processes. The CMP equipment of the present invention employs strip polishing platens that can be smaller than the wafer size, so that the layout is compact and the space is effectively utilized, leading to high throughput and efficient production management. The present invention provides a CMP equipment that offers greater flexibility in performing CMP for different fabrication processes through the choices of various polishing pads and/or polishing slurry.
摘要:
A wafer carrier assembly for a chemical mechanical polishing apparatus and a polishing method using the same are provided. The present wafer carrier assembly comprises a first plate, a second plate and a flexible membrane. The first plate has a plurality of protrusions formed on a bottom surface thereof and the second plate has a plurality of apertures passing through. Each of the protrusions is matched with one of the apertures to enable the first plate and the second plate to detachably combine together. The flexible membrane is positioned under the second plate and contacts it. A surface of the flexible membrane opposite to the surface of the flexible membrane contacting the second plate provides a wafer-receiving surface.