摘要:
The invention is embodied in a method of determining an optimum de-chucking voltage for nullifying residual electrostatic forces on a wafer in an electrostatic chuck for removal of the wafer from the chuck, including holding the wafer on the electrostatic chuck by applying an electrostatic potential to the chuck, introducing a gas between the wafer and the chuck, reducing the electrostatic potential of the chuck while observing a rate of leakage of the gas from between the wafer and the chuck, and recording as the optimum dechucking voltage the value of the electrostatic potential obtaining when the rate of leakage exceeds a predetermined threshold.
摘要:
An electrostatic chuck (20) for holding a substrate (75) comprises (i) a base (80) having an upper surface (95) with grooves (85) therein, the grooves (85) sized and distributed for holding coolant for cooling a substrate (75), and (ii) a substantially continuous insulator film (45) conformal to the grooves (85) on upper surface (95) of the base (80). The base (80) can be electrically conductive and capable of serving as the electrode (50) of the chuck (20), or the electrode (50) can be embedded in the insulator film (45). The insulator film (45) has a dielectric breakdown strength sufficiently high that when a substrate (75) placed on the chuck (20) and electrically biased with respect to the electrode (50), electrostatic charge accumulates in the substrate (75) and in the electrode (50) forming an electrostatic force that attracts and holds the substrate (75) to the chuck (20). Preferably the chuck (20) is fabricated using a pressure forming process, and more preferably using a pressure differential process.
摘要:
A process for fabricating an electrostatic chuck (20) comprising the steps of (c) forming a base (80) having an upper surface with cooling grooves (85) therein, the grooves sized and distributed for holding a coolant therein for cooling the base; and (d) pressure conforming an electrical insulator layer (45) to the grooves on the base by the steps of (i) placing the base into a pressure forming apparatus (25) and applying an electrical insulator layer over the grooves in the base; and (ii) applying a sufficiently high pressure onto the insulator layer to pressure conform the insulator layer to the grooves to form a substantially continuous layer of electrical insulator conformal to the grooves on the base.
摘要:
A method for fabricating a device which includes a tantalum silicide structure, and which is essentially free of conductive etch residues, is disclosed. The method includes the steps of depositing tantalum and silicon onto a substrate, patterning the tantalum and silicon, and then sintering the patterned tantalum and silicon to form a patterned layer of tantalum silicide.
摘要:
In a plasma-assisted etching apparatus and method designed to pattern silicon dioxide in a plasma derived from a mixture of trifluoromethane and ammonia, surfaces in the reaction chamber are coated with a layer of silicon. Contamination of wafers during the etching process is thereby substantially reduced. In practice, this leads to a significant increase in the yield of acceptable chips per wafer.
摘要:
The compounds TiSi.sub.2 and TaSi.sub.2 have been found to be suitable substitutes for polysilicon layers in semiconductor integrated circuits. Suitable conducting properties of the compounds are ensured by providing a relatively thin substrate of polysilicon.
摘要:
An improved radio frequency (rf) powered radial flow cylindrical reactor utilizes a gas shield which substantially limits the glow plasma discharge reaction to a section of the reactor over the semiconductor substrates which are to be coated. The gas shield permits the use of higher rf input power which contributes to the formation of protective films that have desirable physical and electrical characteristics.
摘要:
Insulation between first and second levels of aluminum metallization in semiconductor integrated circuit structures comprises a plasma planarized, deposited silicon dioxide layer and another silicon dioxide layer deposited upon said plasma planarized layer.
摘要:
The compounds TiSi.sub.2 and TaSi.sub.2 have been found to be suitable substitutes for polysilicon layers in semiconductor integrated circuits. Suitable conducting properties of the compounds are ensured by providing a relatively thin substrate of polysilicon.
摘要:
A mask substrate for use in an x-ray lithographic system comprises a boron nitride member (32, FIG. 2) coated with a polyimide layer (20) whose thickness is approximately the same as that of the boron nitride member. The substrate is mechanically strong and both optically and x-ray transparent. Mask patterns formed on the substrate are characterized by low distortion and a low defect density.