摘要:
An improved method for removing residual slurry particles and metallic residues from the surface of a semiconductor substrate after chemical-mechanical polishing has been developed. The cleaning method involves sequential spray cleaning solutions of NH.sub.4 OH and H.sub.2 O, NH.sub.4 OH, H.sub.2 O.sub.2 and H.sub.2 O, HF and H.sub.2 O, and HCl, H.sub.2 O.sub.2 and H.sub.2 O. The cleaning sequence is: 1. A pre-soak in a spray solution of NH.sub.4 OH and H.sub.2 O; 2. Spray cleaning in a solution of NH.sub.4 OH, H.sub.2 O.sub.2 and H.sub.2 O; 3. Spray cleaning in a dilute solution of HF and H.sub.2 O; 4. Spray rinsing in DI-water. It is important that slurry particulates first be removed by NH.sub.4 OH, H.sub.2 O.sub.2 and H.sub.2 O, followed by spray cleaning in a dilute solution of HF and H.sub.2 O to remove metallic residues. The spray cleaning method is superior to brush cleaning methods for both oxide-CMP and tungsten-CMP and results in superior removal of slurry particles and metallic residues introduced by the CMP processes. An optional spray cleaning step using a solution of HCl, H.sub.2 O.sub.2 and H.sub.2 O results in further reduction of metallic residue contamination following oxide-CMP. Compared to traditional brush cleaning the new spray cleaning process has a 2.times. improvement in throughput, less consumption of DI water, and low risk of cross-contamination between sequentially cleaned substrates.
摘要:
Low-k dielectric layer, semiconductor device, and method for fabricating the same. The low-k dielectric layer comprises a hardened sub-layer sandwiched by two low-k dielectric sub-layers. The hardened sub-layer is formed by a method comprising bombarding the underlying low-k dielectric sub-layer utilizing hydrogen plasma or inert gas plasma. The semiconductor device comprises the low-k dielectric layer overlying an etch stop layer overlying a substrate, and a conductive material embedded in the dielectric layer and the etch stop layer, electrically connecting to the substrate.
摘要:
A method and system is disclosed for reducing slurry usage in a chemical mechanical polishing operation utilizing at least one polishing pad thereof. Slurry can be intermittently supplied to a chemical mechanical polishing device. The slurry is generally flushed so that a portion of said slurry is trapped in a plurality of pores of at least one polishing pad associated with said chemical mechanical polishing device, wherein only a minimum amount of said slurry necessary is utilized to perform said chemical mechanical polishing operation, thereby reducing slurry usage and maintaining a consistent level of slurry removal rate performance and a decrease in particle defects thereof. The present invention thus discloses a method and system for intermittently delivering slurry to a chemical mechanical polishing device in a manner that significantly conserves slurry usage.
摘要:
A method to prevent the accumulation of particle impurities on the surface of a semiconductor substrate that contains wolfram plugs during the process of polishing the surface of the wafer. The polishing sequence consists of three distinct polishing steps whereby the first two steps use hard polishing pads while the third step uses a soft polishing pad with the application of slurry during the third polish.
摘要:
A system and method for forming a semiconductor device is provided. An embodiment comprises forming a silicide region on a substrate along with a transition region between the silicide region and the substrate. The thickness of the silicide precursor material layer along with the annealing conditions are controlled such that there is a larger ratio of one atomic species within the transition region than another atomic species, thereby increasing the hole mobility within the transition region.
摘要:
An electropolishing method for removing potential device-contaminating particles from a wafer, is disclosed. The method includes immersing the wafer in an electropolishing electrolyte solution and removing defects and particles from the wafer by rotational friction between the wafer and the electrolyte solution in combination with electrolysis. The method is effective in removing particles from via openings of all sizes, including via openings having a width smaller than about 0.2 μm.
摘要:
A novel test device and method for calibrating the alignment of a laser beam emitted from a laser metrology tool with respect to a target area on a substrate. The test device includes a laser-sensitive material having a calibration pattern that includes a target point. When the tool is properly adjusted, the laser beam strikes the target point and is released to production. If the laser beam misses the target point, the tool is re-adjusted and re-tested until the laser beam strikes the target point.
摘要:
A method for preventing the formation of voids and contaminants in vias during the fabrication of a metal interconnect structure such as a dual damascene structure is disclosed. The method includes providing a substrate; providing a dielectric layer having trench openings and via openings on the substrate, wherein the ratio of the sum of the areas of the trench openings to the sum of the areas of the via openings is between 1 and 300; wherein the via opening bottom has a width of less than about 25 μm; and electroplating a metal in the trench openings and via openings. An interconnect structure having at least one void-free via is further disclosed.
摘要:
A simple method for calculating the optimum amount of HDP deposited material that needs to be removed during CMP (without introducing dishing) is described. This method derives from our observation of a linear relationship between the amount of material that needs to be removed in order to achieve full planarization and a quantity called “OD for CMP density”. The latter is defined as PA×(100−PS) where PA is the percentage of active area relative to the total wafer area and PS is the percentage of sub-areas relative to the total wafer area. The sub-areas are regions in the dielectric, above the active areas, that are etched out prior to CMP. Thus, once the materials have been characterized, the optimum CMP removal thickness is readily calculated for a wide range of different circuit implementations.
摘要:
This description relates to a sensing product formed using a substrate with a plurality of epi-layers. At least a first epi-layer has a different composition than the composition of a second epi-layer. The sensing product optionally includes at least one radiation sensing element in the second epi-layer and optionally an interconnect structure over the second epi-layer. The sensing product is formed by removing the substrate and all epi-layers other than the second epi-layer. A light incident surface of the second epi-layer has a total thickness variation of less than about 0.15 μm.