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Anthony J. Lochtefeld, Ipswich US

Anthony J. Lochtefeld, Ipswich, MA US

Patent application numberDescriptionPublished
20080257409PHOTOVOLTAICS ON SILICON - Structures including crystalline material disposed in openings defined in a non-crystalline mask layer disposed over a substrate. A photovoltaic cell may be disposed above the crystalline material.10-23-2008
20080265299Strained channel dynamic random access memory devices - DRAM trench capacitors formed by, inter alia, deposition of conductive material into a trench or doping the semiconductor region in which the trench is defined.10-30-2008
20090039361LATTICE-MISMATCHED SEMICONDUCTOR STRUCTURES WITH REDUCED DISLOCATION DEFECT DENSITIES AND RELATED METHODS FOR DEVICE FABRICATION - A method of forming a semiconductor structure includes forming an opening in a dielectric layer, forming a recess in an exposed part of a substrate, and forming a lattice-mismatched crystalline semiconductor material in the recess and opening.02-12-2009
20090065047Multi-Junction Solar Cells - Solar cell structures including multiple sub-cells that incorporate different materials that may have different lattice constants. In some embodiments, solar cell devices include several photovoltaic junctions.03-12-2009
20100176371Semiconductor Diodes Fabricated by Aspect Ratio Trapping with Coalesced Films - A photonic device comprises a substrate and a dielectric material including two or more openings that expose a portion of the substrate, the two or more openings each having an aspect ratio of at least 1. A bottom diode material comprising a compound semiconductor material that is lattice mismatched to the substrate occupies the two or more openings and is coalesced above the two or more openings to form the bottom diode region. The device further includes a top diode material and an active diode region between the top and bottom diode materials.07-15-2010
20100176375Diode-Based Devices and Methods for Making the Same - In accordance with an embodiment, a diode comprises a substrate, a dielectric material including an opening that exposes a portion of the substrate, the opening having an aspect ratio of at least 1, a bottom diode material including a lower region disposed at least partly in the opening and an upper region extending above the opening, the bottom diode material comprising a semiconductor material that is lattice mismatched to the substrate, a top diode material proximate the upper region of the bottom diode material, and an active diode region between the top and bottom diode materials, the active diode region including a surface extending away from the top surface of the substrate.07-15-2010
20100213511Lattice-Mismatched Semiconductor Structures and Related Methods for Device Fabrication - Lattice-mismatched materials having configurations that trap defects within sidewall-containing structures.08-26-2010
20100252861Devices Formed from a Non-Polar Plane of a Crystalline Material and Method of Making the Same - Materials, methods, structures and device including the same can provide a semiconductor device such as an LED using an active region corresponding to a non-polar face or surface of III-V semiconductor crystalline material. In some embodiments, an active diode region contains more non-polar III-V material oriented to a non-polar plane than III-V material oriented to a polar plane. In other embodiments, a bottom region contains more non-polar m-plane or a-plane surface area GaN than polar c-plane surface area GaN facing an active region.10-07-2010
20100301391Tri-Gate Field-Effect Transistors Formed By Aspect Ratio Trapping - Semiconductor structures include a trench formed proximate a substrate including a first semiconductor material. A crystalline material including a second semiconductor material lattice mismatched to the first semiconductor material is formed in the trench. Process embodiments include removing a portion of the dielectric layer to expose a side portion of the crystalline material and defining a gate thereover. Defects are reduced by using an aspect ratio trapping approach12-02-2010
20110049568Lattice-Mismatched Semiconductor Structures with Reduced Dislocation Defect Densities and Related Methods for Device Fabrication - Fabrication of monolithic lattice-mismatched semiconductor heterostructures with limited area regions having upper portions substantially exhausted of threading dislocations, as well as fabrication of semiconductor devices based on such lattice-mismatched heterostructures.03-03-2011
20110073908III-V Semiconductor Device Structures - The benefits of strained semiconductors are combined with silicon-on-insulator approaches to substrate and device fabrication.03-31-2011
20110114996Inducement of Strain in a Semiconductor Layer - Strain is induced in a semiconductor layer. Embodiments include inducing strain by, for example, creation of free surfaces.05-19-2011

Patent applications by Anthony J. Lochtefeld, Ipswich, MA US