摘要:
A method for forming a graphene layer is disclosed herein. The method includes establishing an insulating layer on a substrate such that at least one seed region, which exposes a surface of the substrate, is formed. A seed material in the seed region is exposed to a carbon-containing precursor gas, thereby initiating nucleation of the graphene layer on the seed material and enabling lateral growth of the graphene layer along at least a portion of a surface of the insulating layer.
摘要:
A semiconductor device which has controlled optical absorption includes a substrate, and a semiconductor layer supported by the substrate. The semiconductor has variable optical absorption at a predetermined optical frequency in relationship to a bandgap of the semiconductor layer. Also included is a strain application structure coupled to the semiconductor layer to create a strain in the semiconductor layer to change the semiconductor bandgap.
摘要:
A method for forming a graphene layer is disclosed herein. The method includes establishing an insulating layer on a substrate such that at least one seed region, which exposes a surface of the substrate, is formed. A seed material in the seed region is exposed to a carbon-containing precursor gas, thereby initiating nucleation of the graphene layer on the seed material and enabling lateral growth of the graphene layer along at least a portion of a surface of the insulating layer.
摘要:
A method for making a multi-level nanowire structure includes establishing a first plurality of nanowires on a substrate surface, wherein at least some of the nanowires are i) aligned at a predetermined crystallographically defined angle with respect to the substrate surface, ii) aligned substantially perpendicular with respect to the substrate surface, or iii) combinations of i and ii. An insulating layer is established between the nanowires of the first plurality such that one of two opposed ends of at least some of the nanowires positioned i) at the predetermined crystallographically defined angle, ii) substantially perpendicular with respect to the substrate surface, or iii) combinations of i and ii is exposed. Regions are grown from each of the exposed ends, and such regions coalesce to form a substantially continuous layer on the insulating layer. A second plurality of nanowires is established on the substantially continuous layer.
摘要:
A structure includes a first amorphous layer and a second amorphous layer established on the first amorphous layer such that at least an edge of the first amorphous layer or the second amorphous having a predetermined geometry is exposed. A material having a controlled crystal orientation is selectively formed adjacent the exposed edge of the first amorphous layer or the second amorphous having the predetermined geometry.
摘要:
A ridge waveguide with decreased optical losses from surface scattering includes a ridge waveguide with etched surfaces and an optical layer deposited on the ridge waveguide that substantially covers the etched surfaces. A method of reducing optical energy losses from scattering at etched surfaces of a ridge waveguide includes depositing a layer of optical material over the etched surfaces, the layer of optical material filling surface irregularities in the etched surfaces.
摘要:
An optical interconnect has a plurality of optical sources, a first lens configured to collimate optical beams from the plurality of optical sources, a second lens configured to refocus the optical beams, and a plurality of optical receivers configured to receive the refocused optical beams from the second lens.
摘要:
A process is provided for fabricating rounded three-dimensional germanium active channels for transistors and sensors. For forming sensors, the process comprises providing a crystalline silicon substrate; depositing an oxide mask on the crystalline silicon substrate; patterning the oxide mask with trenches to expose linear regions of the silicon substrate; epitaxially grow germanium selectively in the trenches, seeded from the silicon wafer; optionally etching the SiO2 mask partially, so that the cross section resembles a trapezoid on a stem; and annealing at an elevated temperature. The annealing process forms the rounded channel. For forming transistors, the process further comprises depositing and patterning a gate oxide and gate electrode onto this structure to form the gate stack of a MOSFET device; and after patterning the gate, implanting dopants into the source and drain located on the parts of the germanium cylinder on either side of the gate line.
摘要:
A device disclosed herein includes a first layer, a second layer, and a first plurality of nanowires established between the first layer and the second layer. The first plurality of nanowires is formed of a first semiconductor material. The device further includes a third layer, and a second plurality of nanowires established between the second and third layers. The second plurality of nanowires is formed of a second semiconductor material having a bandgap that is the same as or different from a bandgap of the first semiconductor material.
摘要:
A semiconductor device which has controlled optical absorption includes a substrate, and a semiconductor layer supported by the substrate. The semiconductor has variable optical absorption at a predetermined optical frequency in relationship to a bandgap of the semiconductor layer. Also included is a strain application structure coupled to the semiconductor layer to create a strain in the semiconductor layer to change the semiconductor bandgap.