Abstract:
A method of forming III-V epitaxy (42) on a germanium-on-insulator (GOI) substrate 40having a bonded layer (14) and a handle substrate(12) begins with measuring a lattice parameter of the bonded layer at a first temperature. The lattice parameter of the bonded layer, which is a function of a coefficient of thermal expansion (CTE) of the handle substrate, is then calculated at an epitaxial growth temperature. An epitaxial composition is selected from a class of III-V material for epitaxial growth overlying the bonded layer, wherein the selected epitaxial composition is adjusted to have a lattice parameter that approximates the calculated lattice parameter of the bonded layer at the epitaxial growth temperature. An epitaxial layer (42) can then be grown over the bonded layer (14) with use of the adjusted epitaxial composition, producing a substantially defect-free III-V epitaxial layer. Furthermore, an improved defectivity is claimed when the epitaxial layer's CTE is approximately similar to that of the handle substrate.
Abstract:
Methods and apparatus are provided for depositing a layer of pure germanium (12) can on a silicon substrate (11). This germanium layer is very thin, on the order of about 14 A, and is less than the critical thickness for pure germanium on silicon. The germanium layer (12) serves as an intermediate layer between the silicon substrate (11) and the high k gate layer (13), which is deposited on the germanium layer (12). The germanium layer (12) helps to avoid the development of an oxide interfacial layer during the application of the high k material. Application of the germanium intermediate layer in a semiconductor structure results in a high k gate functionality without: the drawbacks of series capacitance due to oxide impurities. The germanium layer (12) further improves mobility.
Abstract:
A method is provided for making an inductor comprising forming a catalytic material (14) over a substrate (12); and creating a network of one dimensional nanostructures (30) on the catalytic material, the network providing an inductance when a voltage is applied thereacross. This inductor is described in three applications: as an on-chip inductor for electronic circuitry, as a magnetic sensor, and as an environmental sensor. Several embodiments are described herein for forming networks of nanostructures on or above the substrate that provide an inductance having a high Q and a reduced die size for RF circuits. Several embodiments are also described for use of the nanostructure to sense gasses, radiation, a magnetic field, and the like.
Abstract:
A method is provided for making an inductor comprising forming a catalytic material (14) over a substrate (12); and creating a network of one dimensional nanostructures (30) on the catalytic material, the network providing an inductance when a voltage is applied thereacross. This inductor is described in three applications: as an on-chip inductor for electronic circuitry, as a magnetic sensor, and as an environmental sensor. Several embodiments are described herein for forming networks of nanostructures on or above the substrate that provide an inductance having a high Q and a reduced die size for RF circuits. Several embodiments are also described for use of the nanostructure to sense gasses, radiation, a magnetic field, and the like.
Abstract:
A method of forming III-V epitaxy (42) on a germanium-on-insulator (GOI) substrate 40having a bonded layer (14) and a handle substrate(12) begins with measuring a lattice parameter of the bonded layer at a first temperature. The lattice parameter of the bonded layer, which is a function of a coefficient of thermal expansion (CTE) of the handle substrate, is then calculated at an epitaxial growth temperature. An epitaxial composition is selected from a class of III-V material for epitaxial growth overlying the bonded layer, wherein the selected epitaxial composition is adjusted to have a lattice parameter that approximates the calculated lattice parameter of the bonded layer at the epitaxial growth temperature. An epitaxial layer (42) can then be grown over the bonded layer (14) with use of the adjusted epitaxial composition, producing a substantially defect-free III-V epitaxial layer. Furthermore, an improved defectivity is claimed when the epitaxial layer's CTE is approximately similar to that of the handle substrate.