摘要:
Crystalline heterostructures including an elevated crystalline structure extending from one or more trenches in a trench layer disposed over a crystalline substrate are described. In some embodiments, an interfacial layer is disposed over a silicon substrate surface. The interfacial layer facilitates growth of the elevated structure from a bottom of the trench at growth temperatures that may otherwise degrade the substrate surface and induce more defects in the elevated structure. The trench layer may be disposed over the interfacial layer with a trench bottom exposing a portion of the interfacial layer. Arbitrarily large merged crystal structures having low defect density surfaces may be overgrown from the trenches. Devices, such as III-N transistors, may be further formed on the raised crystalline structures while silicon-based devices (e.g., transistors) may be formed in other regions of the silicon substrate.
摘要:
The invention propoeses processes for the preparation of an assembly (10, 12, 22, 30) based on semiconductors comprising a first layer such as a thin layer (22). A process comprises the followingsteps: form an interface layer (26) on only one (22) of the two layers, bring the layer on which the interface layer is formed and the other exposed layer into contact with each other, the interface layer (26) being chosen as a function of the material in the exposed layer to form a bonding interface that can be separated under the action of stresses applied after exposure to temperatures within a predetermined range. Application to the manufacture of substrates that can be separated from the support in the fields of electronics, optoelectronics or optics.
摘要:
The purpose of the invention is to provide a high resistivity silicon carbide substrate with electrical properties and structural quality suitable for subsequent device manufacturing, such as for example high frequency devices, so that the devices can exhibit stable and linear characteristics and to provide a high resistivity silicon carbide substrate having a low density of structural defects and a substantially controlled uniform radial distribution of its resistivity.
摘要:
A high-resistivity silicon carbide single crystal is disclosed that includes at least one compensated dopant having an electronic energy level far enough from an edge of the silicon carbide bandgap to avoid conductive behavior, while far enough from mid-gap towards the band edge to create a greater band offset than do mid-level states when the substrate is in contact with a doped silicon carbide epitaxial layer and when the net amount of the dopant present in the crystal is sufficient to pin the Fermi level at the dopant's electronic energy level. The silicon carbide crystal has a restivity of at least 5000 ohms-centimeters at room temperature.
摘要:
The invention concerns a method for making substrates, in particular for optics, electronics or optoelectronics. The method comprises steps which consist in: transferring a seed layer (2) onto a support (12) by molecular adhesion at the bonding interface; epitaxial growth of a useful layer (16) on the seed layer, and applying stresses to produce removal of the formed assembly from the seed layer (2) and the useful layer (16) relative to the support (12) at the bonding interface.
摘要:
The present invention provides semiconductor devices having at least one silicon region in a silicon carbide wafer in which is fabricated a low voltage semiconductor device and on the same chip, at least one silicon carbide region in which is fabricated a high voltage (i.e., >1000V) semiconductor device it comprises the steps of: producing a region of amorphous silicon carbide on a monocrystalline silicon carbide substrate; removing at least an effective amount of carbon from said amorphized region, preferably by subjecting at least a portion of the amorphous silicon carbide region to an etchant material which selectively removes carbon to produce a region of amorphous silicon on a monocrystalline silicon carbide substrate; and subjecting the monocrystalline substrate with at least a region of amorphous silicon to high temperature thermal anneal to produce a region of monocrystalline silicon on said monocrystalline silicon carbide substrate.
摘要:
A semiconductor heterostructure (a) is formed by mixing the elemental semiconductor germanium (Ge) with the compound semiconductor silicon carbide (SiC) to form an alloy of silicon carbide: germanium (SiC:Ge). The alloy (SiCGe) could be used alone or in multilayered structures with other semiconductors to improve the performance of electronic and optical devices and circuits.