Abstract:
High quality epitaxial layers of monocrystalline materials can be grown overlying monocrystalline substrates such as large silicon wafers by forming a compliant substrate for growing the monocrystalline layers. An accommodating buffer layer comprises a layer of monocrystalline oxide spaced apart from a silicon wafer by an amorphous interface layer of silicon oxide. The amorphous interface layer dissipates strain and permits the growth of a high quality monocrystalline oxide accommodating buffer layer. The accommodating buffer layer has lattice registry to both the underlying silicon wafer and the overlying monocrystalline material layer. Formation of a compliant substrate preferably includes utilizing enhanced epitaxy of a surfactant template layer. The surfactant template layer may be formed by depositing an organometallic compound on the accommodating buffer layer using atomic layer epitaxy. In certain preferred embodiments, the organometallic compound is an aluminum-containing compound.
Abstract:
Process for fabricating a semiconductor structure (34), and the resulting products, having reduced crystal defects and/or contamination in a monocrystalline compound semiconductor layer (26) that is compliantly attached to a monocrystalline semiconductor substrate (22) via an accommodating buffer layer (36), a capping/template layer (30), and a thin monocrystalline compound semiconductor seed film (38) comprised of a compound semiconductor, in that order from furthest to closest to layer (26). To accomplish this, a thin monocrystalline compound semiconductor seed film (38) is formed on an intermediate structure (33) including a monocrystalline perovskite buffer layer (24) and an overlying capping/template layer (30), and the resulting structure (33) is annealed at a temperature effective to reduce crystal defects in the compound semiconductor seed film (38), and optionally also may be used to amorphize the monocrystalline perovskite layer, all before a compound semiconductor layer (26) is formed thereon in a device-thickness.
Abstract:
High quality epitaxial layers of monocrystalline materials can be grown overlying monocrystalline substrates such as large silicon wafers by forming a compliant substrate for growing the monocrystalline layers. An accommodating buffer layer comprises a layer of monocrystalline oxide spaced apart from a silicon wafer by an amorphous interface layer of silicon oxide. The amorphous interface layer dissipates strain and permits the growth of a high quality monocrystalline oxide accommodating buffer layer. The accommodating buffer layer is lattice matched to both the underlying silicon wafer and the overlying monocrystalline material layer. Any lattice mismatch between the accommodating buffer layer and the underlying silicon substrate is taken care of by the amorphous interface layer. In addition, formation of a compliant substrate includes utilizing an intermetallic layer of an intermetallic compound material.
Abstract:
High quality epitaxial layers of monocrystalline materials can be grown overlying monocrystalline substrates such as large silicon wafers by forming a compliant substrate for growing the monocrystalline layers. One way to achieve the formation of a compliant substrate includes first growing an accommodating buffer layer on a silicon wafer. The accommodating buffer layer is a layer of monocrystalline oxide spaced apart from the silicon wafer by an amorphous interface layer of silicon oxide. The amorphous interface layer dissipates strain and permits the growth of a high quality monocrystalline oxide accommodating buffer layer. The accommodating buffer layer is lattice matched to both the underlying silicon wafer and the overlying monocrystalline material layer. A monocrystalline graded layer, in which the lattice constant varies with the thickness of the layer, is then formed over the accommodating buffer layer, such that a lattice constant of the top of the graded layer substantially matches the lattice constant of a subsequently grown monocrystalline film.
Abstract:
High quality epitaxial layers of compound semiconductor materials can be grown overlying large silicon wafers by first growing an accommodating buffer layer on a silicon wafer. The accommodating buffer layer is a layer of monocrystalline oxide spaced apart from the silicon wafer by an amorphous interface layer of silicon oxide. The amorphous interface layer dissipates strain and permits the growth of a high quality monocrystalline oxide accommodating buffer layer. The accommodating buffer layer is lattice matched to both the underlying silicon wafer and the overlying monocrystalline compound semiconductor layer. Any lattice mismatch between the accommodating buffer layer and the underlying silicon substrate is taken care of by the amorphous interface layer.
Abstract:
High quality epitaxial layers of compound semiconductor materials can be grown overlying large silicon wafers by first growing an accommodating buffer layer on a silicon wafer. The accommodating buffer layer is a layer of monocrystalline oxide spaced apart from the silicon wafer by an amorphous interface layer of silicon oxide. The amorphous interface layer dissipates strain and permits the growth of a high quality monocrystalline oxide accommodating buffer layer. The accommodating buffer layer is lattice matched to both the underlying silicon wafer and the overlying monocrystalline compound semiconductor layer. Any lattice mismatch between the accommodating buffer layer and the underlying silicon substrate is taken care of by the amorphous interface layer.
Abstract:
High quality epitaxial layers of monocrystalline materials can be grown overlying monocrystalline substrates such as large silicon wafers or compound semiconductor wafers by forming a compliant substrate for growing the monocrystalline layers. In particular, a compliant large area GaN substrate can be fabricated for forming semiconductor structures and devices. An accommodating buffer layer comprises a layer of monocrystalline oxide spaced apart from a silicon wafer by an amorphous interface layer of silicon oxide. The amorphous interface layer dissipates strain and permits the growth of a high quality monocrystalline oxide accommodating buffer layer. The accommodating buffer layer is lattice matched to both the underlying silicon wafer and the overlying monocrystalline material layer. Any lattice mismatch between the accommodating buffer layer and the underlying silicon substrate is taken care of by the amorphous interface layer. In addition, formation of a compliant large area GaN substrate may include utilizing surfactant enhanced epitaxy, epitaxial growth of single crystal silicon onto single crystal oxide, and epitaxial growth of Zintl phase materials and the resulting large area GaN substrate may be formed as a defect free stand alone substrate.
Abstract:
Semiconductor structures are provided with high quality epitaxial layers of monocrystalline materials grown over monocrystalline substrates such as large silicon wafers utilizing a compliant substrate. One way to achieve the formation of a compliant substrate includes first growing an accommodating buffer layer on a silicon wafer. The accommodating buffer layer is lattice matched to both the underlying silicon wafer and an overlying monocrystalline material layer. With laser assisted fabrication, a laser energy source is used to preclean the accommodating buffer layer, to excite the accommodating buffer layer to higher energy to promote two-dimensional growth, and to amorphize the accommodating buffer layer, without requiring transport of the semiconductor structure from one environment to another. When chemical vapor deposition is utilized, the laser radiation source can also be employed to crack volatile chemical precursors and to enable selective deposition.
Abstract:
High quality epitaxial layers of monocrystalline materials can be grown overlying monocrystalline substrates such as large silicon wafers by forming a compliant substrate for growing the monocrystalline layers. An accommodating buffer layer comprises a layer of monocrystalline oxide spaced apart from a silicon wafer by an amorphous interface layer of silicon oxide. The amorphous interface layer dissipates strain and permits the growth of a high quality monocrystalline oxide accommodating buffer layer. The accommodating buffer layer is lattice matched to both the underlying silicon wafer and the overlying monocrystalline material layer. Any lattice mismatch between the accommodating buffer layer and the underlying silicon substrate is taken care of by the amorphous interface layer. In addition, formation of a compliant substrate may include utilizing surfactant enhanced epitaxy, epitaxial growth of single crystal silicon onto single crystal oxide, and epitaxial growth of Zintl phase materials. The strain relief provided by the amorphous interface layer reduces the amount of defects, such as dislocations, occurring in the semiconductor structure and allows a higher crystalline quality to be obtained. The propagation of dislocations can further be controlled by applying a strain controlling element to the semiconductor structure. The strain controlling element may include a distorting material applied to the substrate and having a different thermal property than the substrate so that the distorting material can induce a strain in the semiconductor structure to compensate for strain induced in the semiconductor structure during its manufacture. The strain controlling element may also include a pattern growth for controlling the location of dislocations in the semiconductor structure.
Abstract:
High quality epitaxial layers of monocrystalline III-V arsenide nitride materials can be grown overlying monocrystalline substrates such as large silicon wafers by forming a compliant substrate for growing the monocrystalline layers. One way to achieve the formation of a compliant substrate includes first growing an accommodating buffer layer on a silicon wafer. The accommodating buffer layer is a layer of monocrystalline oxide spaced apart from the silicon wafer by an amorphous interface layer of silicon oxide. The amorphous interface layer dissipates strain and permits the growth of a high quality monocrystalline oxide accommodating buffer layer. The accommodating buffer layer is lattice matched to both the underlying silicon wafer and the overlying monocrystalline III-V arsenide nitride material layer. Any lattice mismatch between the accommodating buffer layer and the underlying silicon substrate is taken care of by the amorphous interface layer. In addition, an accommodating buffer layer comprising a barium strontium titanium oxide and a monocrystalline III-V arsenide nitride layer, such as GaAsN, having a nitrogen concentration ranging from 1-5% function to further reduce any lattice mismatch between layers.