Abstract:
A method for forming a suspended microstructure is provided. The method includes providing a monocrystalline target substrate and subjecting the surface of the monocrystalline target substrate to ion implantation to form a microstructure layer at the surface of the monocrystalline target substrate. An epitaxial material layer is formed overlying the microstructure layer. A handle substrate is provided and a patterned interposed material layer is provided between the epitaxial material layer and the handle substrate. The epitaxial material layer, the patterned interposed material layer and the handle substrate are affixed. The method further includes thermally treating the monocrystalline target substrate to effect separation between the microstructure layer and a remainder of the monocrystalline target substrate.
Abstract:
An epitaxial silicon wafer which comprises a silicon wafer produced by a method characterized as comprising pulling up a silicon single crystal under a condition wherein when an oxygen concentration is 7null1017 atoms/cm3 a nitrogen concentration is about 3null1015 atoms/cm3 or less, and when an oxygen concentration is 1.6null1018 atoms/cm3 a nitrogen concentration is about 3null1014 atoms/cm3 or less, and, an epitaxial film formed on the wafer. The epitaxial film, being formed on such a wafer, has crystal defects, which are observed as LPD of 120 nm or more on the epitaxial film, in a range of 20 pieces/200-mm wafer or less. The epitaxial silicon wafer contains nitrogen atoms doped therein and also has satisfactory characteristics as that for use in a semiconductor device.
Abstract translation:一种外延硅晶片,其包括通过以下方法制造的硅晶片,所述方法的特征在于包括在氧浓度为7×10 17原子/ cm 3时提高硅单晶,氮浓度为约3×10 15 原子/ cm 3以下,当氧浓度为1.6×10 18原子/ cm 3时,氮浓度为约3×10 14原子/ cm 3以下,形成外延膜 在晶圆上。 在这种晶片上形成的外延膜具有晶体缺陷,其在外延膜上的L DD为120nm以上,在20个/ 200mm以下的晶片的范围内。 外延硅晶片含有掺杂的氮原子,并且具有与在半导体器件中使用的特性一样的令人满意的特性。
Abstract:
Liquid-crystalline medium having a dielectric anisotropy nullnull of null3, comprising compounds of the general formula (I), 1 in which R is as defined herein, are suitable for use as liquid-crystalline media for, e.g., IPS, MLC, TN or STN displays, but in particular for LCoS displays. The media have very high specific resistance values, low threshold voltages, short response times and high birefringence values nullnull, while maintaining other boundary conditions.
Abstract:
A partial SOI substrate is obtained by performing a step of forming a partial insulating layer on the first substrate, a step of selectively growing the first semiconductor layer on an exposed portion of the first substrate, a step of growing the second semiconductor layer in the partial insulating layer on the first semiconductor layer, and a step of forming a bonded substrate by bonding the second substrate to the second semiconductor layer of the first substrate.
Abstract:
A heat treatment chamber (30) is provided comprising a treatment region containing a charge (5) of compound material comprising a plurality of n atomic species, each atomic species being associated with at least one gas species. The chamber (30) is placed in a furnace (7). The chamber has a gas permeable barrier, constituted by a plug (4) and wadding (6), which partially encloses the treatment region. The barrier serves as an effusive hole to inhibit, but not prevent, gas vapour release, thereby to elevate the gas vapour pressure in the treatment region. Application of inert gas through a valve (8) is also used to increase background pressure in the treatment region during heat treatment. The elevated gas pressures present in the treatment region during treatment are measurable in an absorption cell (3) adjacent to the treatment region. It is thus possible to monitor the gas pressures during heat treatment and thereby stop the heat treatment once a desired charge stoichiometry is achieved. This improves over prior art heat treatment which is carried out in vacuum and thus precludes optical absorption measurement of the gas pressures during heat treatment.
Abstract:
A method is provided for growing thin oxide films on the surface of a substrate by alternatively reacting the surface of the substrate with a metal source material and an oxygen source material. The oxygen source material is preferably a metal alkoxide. The metal source material may be a metal halide, hydride, alkoxide, alkyl, a cyclopentadienyl compound, or a diketonate.
Abstract:
A method is disclosed for forming a silicon carbide component. The method calls for providing a preform, including carbon, purifying the preform to remove impurities to form a purified preform, and exposing the purified preform to a molten infiltrant which includes silicon. According to the foregoing method, the molten infiltrant reacts with the carbon to form silicon carbide. The silicon carbide component formed according to this method may be particularly suitable for use in semiconductor fabrication processes, as a semiconductor processing component.
Abstract:
A method of producing a p doped wide bandgap semiconductor including growing a semiconductor in the presence of an element apt acting as a surfactant at a growth surface of the semiconductor and inhibiting formation of vacancies, and doping the semiconductor with a selected p dopant.
Abstract:
A method of single crystal welding is provided for the production of a single crystal region (1) on a surface (2) of a moncrystalline substrate (3) by means of an energy beam (4). The method of single crystal welding includes the supply of a coating material (5), the formation of a melt (6) by melting the coating material (5) by means of the energy beam (4) and the melting of a surface layer (71, 72) of the single crystal substrate (3) by the energy beam (4). The characteristic (8) of the energy distribution in the energy beam (4) is set, in this connection, such that the lateral thermal flow (H1) from the melt into the single crystal substrate (3) is minimised.
Abstract:
After a Group III-V compound semiconductor layer, to which a p-type dopant has been introduced, has been formed over a substrate, the compound semiconductor layer is annealed. In the stage of heating the compound semiconductor layer, atoms, deactivating the p-type dopant, are eliminated from the compound semiconductor layer by creating a temperature gradient in the compound semiconductor layer.