Abstract:
To achieve a uniform texture, large crystalline grains or, in some cases, a single crystalline orientation in a thick (>1 .mu.m) film on a foreign substrate, the film is formed so as to be thin (
Abstract:
A substrate is coated with a film to be recrystallized. A pattern of crystallization barriers is created in the film, for example, by etching voids in the film. An encapsulation layer is generally applied to protect the film, fill the voids and otherwise enhance a recrystallization process. Recrystallization is carried out such that certain orientations pass preferentially through the barrier, generally as a result of growth-velocity anisotropy. The result is a film of a specific predetermined crystallographic orientation, a range of orientations or a set of discrete orientations.
Abstract:
A virtual substrate includes a handle support and a strain-relieved single crystalline layer on the handle support. A method of making the virtual substrate includes growing a coherently-strained single crystalline layer on an initial growth substrate, removing the initial growth substrate to relieve the strain on the single crystalline layer, and applying the strain-relieved single crystalline layer on a handle support.
Abstract:
A structure comprising an array of semiconductor structures, an infill material between the semiconductor materials, and one or more light-trapping elements is described. Photoconverters and photoelectrochemical devices based on such structure also described.
Abstract:
The present invention provides strategies for making higher quality p-n heterojunctions that incorporate cuprous oxide and another material suitable for forming the heterojunction. When incorporated into microelectronic devices, these improved heterojunctions would be expected to provide improved microelectronic properties such as improved defect density, in particular lower interfacial defect density at the p-n heterojunction, leading to improved microelectronic devices such as solar cell devices with improved open circuit voltage, fill factor, efficiency, current density, and the like.
Abstract:
The present invention relates to devices, particularly photovoltaic devices, incorporating Group IIB/VA semiconductors such phosphides, arsenides, and/or antimonides of one or more of Zn and/or Cd. In particular, the present invention relates to methodologies, resultant products, and precursors thereof in which electronic performance of the semiconductor material is improved by causing the Group IIB/VA semiconductor material to react with at least one metal-containing species (hereinafter co-reactive species) that is sufficiently co-reactive with at least one Group VA species incorporated into the Group IIB/VA semiconductor as a lattice substituent (recognizing that the same and/or another Group VA species also optionally may be incorporated into the Group IIB/VA semiconductor in other ways, e.g., as a dopant or the like).
Abstract:
A solar cell includes a nano-scale patterned back contact layer; a spacer layer on the nano-scale patterned back contact layer; a semiconductor layer on the spacer layer; and a light transmissive first electrode on the semiconductor layer.
Abstract:
A structure consisting of well-ordered semiconductor structures embedded in a binder material which maintains the ordering and orientation of the semiconductor structures. Methods for forming such a structure include forming the semiconductor structures on a substrate, casting a binder material onto the substrate to embed the semiconductor structures in the binder material, and separating the binder material from the substrate at the substrate. These methods provide for the retention of the orientation and order of highly ordered semiconductor structures in the separated binder material.
Abstract:
Systems and methods for manipulating light with tunable ferroelectric photonic devices. Devices having tunable properties that exhibit photonic bandgap behavior are fabricated from ferroelectric materials. Apparatus is provided to apply tuning signals to the ferroelectric material using one or more of electric fields, mechanical forces, optical fields, and thermal fields. Control circuitry is provided to generate the control signals needed to apply the tuning signals. Input and output ports are provided to allow input signals to be received and to provide output signals. In some cases, a feedback loop is provided to use a portion of the output signal as a diagnostic signal for control of the operation of the device within an acceptable range. It is expected that ferroelectric photonic devices operating according to principles of the invention will be useful for a wide variety of applications, including optical switching, optical modulation, optical computing, and performing logic optically.