摘要:
A plasma etch process is described for the etching of oxide with a high selectivity to nitride, including nitride formed on uneven surfaces of a substrate, e.g., on sidewalls of steps on an integrated circuit structure. The addition of a hydrogen-bearing gas to C4F8 or C2F6 etch gases and a scavenger for fluorine, in a plasma etch process for etching oxide in preference to nitride, results in a high selectivity to nitride which is preserved regardless of the topography of the nitride portions of the substrate surface.
摘要:
An etching method used in the high density plasma etching system to etch a silicon oxide dielectric layer to form openings of different depths. The method uses a mixture of C.sub.4 H.sub.8, CH.sub.2 F.sub.2, and Ar as an etching gas source to etch the silicon oxide dielectric layer, forming a plurality of openings of a first depth. A mixture of C.sub.4 H.sub.8, CO, and Ar is used as an etching gas source to etch the silicon oxide dielectric layer exposed by the first opening, so that the opening is deepened to the second depth. Using a mixture of C.sub.4 H.sub.8, CH.sub.2 F.sub.2, CO, and Ar as the etching gas source, the silicon oxide dielectric layer exposed by the opening is etched, so that the openings are deepened to the third depth and the fourth depth.
摘要:
A general method of the invention is to provide a polymer-hardening precursor piece (such as silicon, carbon, silicon carbide or silicon nitride, but preferably silicon) within the reactor chamber during an etch process with a fluoro-carbon or fluoro-hydrocarbon gas, and to heat the polymer-hardening precursor piece above the polymerization temperature sufficiently to achieve a desired increase in oxide-to-silicon etch selectivity. Generally, this polymer-hardening precursor or silicon piece may be an integral part of the reactor chamber walls and/or ceiling or a separate, expendable and quickly removable piece, and the heating/cooling apparatus may be of any suitable type including apparatus which conductively or remotely heats the silicon piece.
摘要:
A method for plasma processing characterized by the steps of disposing a wafer proximate to a cathode within a process chamber, releasing a gas into the chamber, applying R.F. power in the VHF/UHF frequency range to the cathode to form a plasma within the chamber, developing a magnetic field within the chamber having flux lines substantially perpendicular to the surface of the wafer, and varying the strength of the magnetic field until a desired cathode sheath voltage is attained. The apparatus includes a chamber, a wafer-supporting cathode disposed within the chamber, a mechanism for introducing gas into the chamber, an R.F. power source coupled to the cathode operating in the frequency from about 50-800 megahertz, an electromagnetic coil disposed around the chamber adapted to develop a magnetic field within the chamber which is substantially perpendicular to the wafer and a variable output power supply coupled to the coil to vary the magnetic field strength and therefore the cathode sheath voltage within the chamber.
摘要:
An improved method of fabricating integrated circuit structures on semiconductor wafers using a plasma-assisted process is disclosed wherein the plasma is generated by a VHF/UHF power source at a frequency ranging from about 50 to about 800 MHz. Low pressure plasma-assisted etching or deposition processes, i.e., processes may be carried out within a pressure range not exceeding about 500 milliTorr; with a ratio of anode to cathode area of from about 2:1 to about 20:1, and an electrode spacing of from about 5 cm. to about 30 cm. High pressure plasma-assisted etching or deposition processes, i.e., processes may be carried out with a pressure ranging from over 500 milliTorr up to 50 Torr or higher; with an anode to cathode electrode spacing of less than about 5 cm. By carrying out plasma-assisted processes using plasma operated within a range of from about 50 to about 800 MHz, the electrode sheath voltages are maintained sufficiently low, so as to avoid damage to structures on the wafer, yet sufficiently high to preferably permit initiation of the processes without the need for supplemental power sources. Operating in this frequency range may also result in reduction or elimination of microloading effects.
摘要:
First, a substrate with a recess is provided in a semiconductor process. Second, an embedded SiGe layer is formed in the substrate. The embedded SiGe layer includes an epitaxial SiGe material which fills up the recess. Then, a pre-amorphization implant (PAI) procedure is carried out on the embedded SiGe layer to form an amorphous region. Next, a source/drain implanting procedure is carried out on the embedded SiGe layer to form a source doping region and a drain doping region. Later, a source/drain annealing procedure is carried out to form a source and a drain in the substrate. At least one of the pre-amorphization implant procedure and the source/drain implanting procedure is carried out in a cryogenic procedure below −30° C.
摘要:
A semiconductor device includes a plurality of active areas disposed on a semiconductor substrate. A manufacturing method of the semiconductor device includes performing a first annealing process on the semiconductor substrate by emitting a first laser alone a first scanning direction, and performing a second annealing process on the semiconductor substrate by emitting a second laser alone a second scanning direction. The first scanning direction and the second scanning direction have an included angle.
摘要:
A semiconductor process is provided, including following steps. A polysilicon layer is formed on a substrate. An asymmetric dual-side heating treatment is performed to the polysilicon layer, wherein a power for a forntside heating is different from a power for a backside heating.
摘要:
A method of fabricating a MOS device comprises steps as follows: An interfacial layer, a high-k dielectric layer and a cover layer on a substrate are sequentially formed. Then an in-situ wet etching step is performed by sequentially using a first etching solution to etch the cover layer and using a second etching solution to etch the high-k dielectric layer and the interfacial layer until the substrate is exposed, wherein the second etching solution is a mixed etching solution containing the first etching solution.
摘要:
A semiconductor device includes a plurality of active areas disposed on a semiconductor substrate. A manufacturing method of the semiconductor device includes performing a first annealing process on the semiconductor substrate by emitting a first laser alone a first scanning direction, and performing a second annealing process on the semiconductor substrate by emitting a second laser alone a second scanning direction. The first scanning direction and the second scanning direction have an incident angle.