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 method is disclosed for depositing a Black Diamond layer in a CVD chamber. Trimethylsilane, O2, and Ar are flowed into the chamber at 300° C. to 400° C. with an O2:Ar:trimethylsilane flow rate ratio that is preferably 1:1.5:6. The resulting low k dielectric layer is formed with a higher deposition rate than when Ar is omitted and has a k value of about 3 that increases only slightly in O2 plasma. A higher density, hardness, and tensile strength are achieved in the Black Diamond layer when Ar is included in the deposition process. The addition of Ar in the deposition maintains film thickness uniformity below 2% for a longer period so that PM cleaning operations are less frequent and affords a lower fluorocarbon plasma etch rate to enable improved trench depth control in a damascene scheme. A lower leakage current and higher breakdown voltage in achieved in the resulting metal interconnect.
摘要:
A method for reducing contaminants in a processing chamber 10 having chamber plasma processing region components comprising the following steps. The chamber plasma processing region components are cleaned. The chamber is then seasoned as follows. A first USG layer is formed over the chamber plasma processing region components. An FSG layer is formed over the first USG layer. A second USG layer is formed over the FSG layer. Wherein the USG, FSG, and second USG layers comprise a UFU season film. A UFU season film coating the chamber plasma processing region components of a processing chamber comprises: an inner USG layer over the chamber plasma processing region components; an FSG layer over the inner USG layer; and an outer USG layer over the FSG layer.
摘要:
A method of forming a shallow trench isolation structure comprising the following steps. A substrate having an upper surface is provided. A pad oxide layer is formed upon the substrate. A nitride layer is formed over the pad oxide layer. The nitride layer having an upper surface. A trench is formed by etching the nitride layer, pad oxide layer and a portion of the substrate. The trench having a bottom and side walls. An oxide film is deposited upon the etched nitride layer surface, and the bottom and side walls of trench. The oxide film is removed from over the etched nitride layer surface, and the bottom of the trench to expose a portion of substrate within the trench. The removal of oxide film leaving oxide spacers over the trench side walls. Epitaxial silicon is selectively deposited over the exposed portion of substrate, filling the trench. A thermal oxide layer is formed over the epitaxial silicon, annealing the interface between the epitaxial silicon and the oxide spacers. The etched nitride layer and the oxide layer from over the etched substrate; and a portion of the oxide spacers extending above the surface of the etched substrate are removed, whereby the shallow trench isolation structure is formed within the trench.
摘要:
A method of forming a PE-silane oxide layer with a greatly reduced particle count is described. A semiconductor substrate is provided over which a silicon oxide film is to be formed. The silicon oxide film is formed by the steps of: 1) pre-flowing a non-silane gas into a deposition chamber for at least two seconds whereby the pre-flowing step prevents formation of particles on the silicon oxide film, and 2) thereafter depositing a silicon oxide film by chemical vapor deposition by flowing a silane gas into the deposition chamber to complete formation of a silicon oxide film using plasma-enhanced chemical vapor deposition in the fabrication of an integrated circuit.
摘要:
A CMP process is provided for the reduction of tungsten damascene residue and the elimination of surface scratch within the surface that is being polished. A three step polishing procedure of the ILD is followed by a two step buffing procedure of the ILD. The three step polishing procedure reduces the device defect count by eliminating damascene residue from the polished surface. The two step buffing procedure reduces micro scratch within the polished surface thus improving device throughput. A two step buffing procedure is applied to the IMD. Oxide buffing is applied and consists of a three step polishing procedure followed by a two step buffing procedure.
摘要:
A method for forming a patterned reflective layer first employs a substrate. There is then formed over the substrate a blanket reflective layer. There is then formed upon the blanket reflective layer an anti-reflective coating (ARC) layer formed employing a plasma enhanced chemical vapor deposition (PECVD) method employing a deposition gas composition comprising silane, nitrous oxide and argon. There is then formed upon the blanket anti-reflective coating (ARC) layer a blanket photoresist layer. There is then photoexposed and developed the blanket photoresist layer to form a patterned photoresist layer. There is then etched, while employing a first etch method, the blanket anti-reflective coating (ARC) layer to form a patterned anti-reflective coating (ARC) layer while employing the patterned photoresist layer as a first etch mask layer. Finally, there is then etched, while employing a second etch method, the blanket reflective layer to form the patterned reflective layer while employing at least the patterned anti-reflective coating (ARC) layer as a second etch mask layer.
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.