Abstract: A group III nitride crystal, wherein the group III nitride crystal is doped with an N-type dopant and a hydrogen element, and the concentration of the N-type dopant is 1×1020 cm?3 or more, and the concentration of the hydrogen element is 1×1019 cm?3 or more.

Abstract: A semiconductor device includes a substrate, a device isolation layer on the substrate, the device isolation layer defining a first active pattern, a pair of first source/drain patterns on the first active pattern, the pair of first source/drain patterns being spaced apart from each other in a first direction, and each of the pair of first source/drain patterns having a maximum first width in the first direction, a first channel pattern between the pair of first source/drain patterns, a gate electrode on the first channel pattern and extends in a second direction intersecting the first direction, and a first amorphous region in the first active pattern, the first amorphous region being below at least one of the pair of first source/drain patterns, and having a maximum second width in the first direction that is less than the maximum first width.

Abstract: A light-receiving element includes a III-V group compound semiconductor substrate, a light-receiving layer having a type II multi-quantum well structure disposed on the substrate, and a type I wavelength region reduction means for reducing light in a wavelength region of type I absorption in the type II multi-quantum well structure disposed on a light incident surface or between the light incident surface and the light-receiving layer.

Abstract: Multijunction solar cells having at least four subcells are disclosed, in which at least one of the subcells comprises a base layer formed of an alloy of one or more elements from group III on the periodic table, nitrogen, arsenic, and at least one element selected from the group consisting of Sb and Bi, and each of the subcells is substantially lattice matched. Methods of manufacturing solar cells and photovoltaic systems comprising at least one of the multijunction solar cells are also disclosed.

Abstract: According to one embodiment, a nitride semiconductor wafer includes: a silicon substrate; a buffer section provided on the silicon substrate; and a functional layer provided on the buffer section and contains nitride semiconductor. The buffer section includes first to n-th buffer layers (n being an integer of 4 or more) containing nitride semiconductor. An i-th buffer layer (i being an integer of 1 or more and less than n) of the first to n-th buffer layers has a lattice length Wi in a first direction parallel to a major surface of the first buffer layer. An (i+1)-th buffer layer provided on the i-th buffer layer has a lattice length W(i+1) in the first direction. In the first to n-th buffer layers the i-th buffer layer and the (i+1)-th buffer layer satisfy relation of (W(i+1)?Wi)/Wi?0.008.

Abstract: A solar cell structure includes stacked layers in reverse order on a germanium substrate. A heterostructure including an (In)GaAs absorbing layer and a disordered emitter layer is provided in the solar cell structures. Controlled spalling may be employed as part of the fabrication process for the solar cell structure, which may be single or multi-junction.

Abstract: A method for manufacturing a solar cell is presented. The method includes: forming an amorphous silicon layer on a first surface of a light absorbing layer; doping the amorphous silicon layer with a dopant; forming a dopant layer by diffusing the dopant into the amorphous silicon layer with a laser; forming a semiconductor layer by removing the dopant that remains outside the dopant layer; etching the surface of the semiconductor layer by using an etchant; forming a first electrode on the semiconductor layer; and forming a second electrode on a second surface of the light absorbing layer.

Abstract: A chemical bath deposition method is presented to prepare different thin films on plane substrates. In particular, they are useful to deposit CdS or ZnS buffer layers in manufacture of thin film solar cells. This method and the deposition apparatus deposit thin films onto vertically travelling plane workpieces delivered by a conveyor belt. The thin films are deposited by continuously spraying the reaction solutions from their freshly mixed styles to gradually aged forms until the designed thickness is obtained. The substrates and the solutions are heated to a reaction temperature. During the deposition processes, the front surfaces of the substrates are totally covered with the sprayed solutions but the substrate backsides are remained dry. The reaction ambience inside the reactor can be isolated from the outside atmosphere. The method is designed to generate a minimum amount of waste solutions for chemical treatments.

Abstract: The present invention relates to optoelectronic device layer structures, light emitting devices, and detectors based upon heterostructures formed between hexagonal boron nitride (hNB) and III nitrides, and more particularly, to heterojunction devices capable of emitting and detecting photons in the ultraviolet (UV) and extremely ultraviolet (RUV) spectral range. The present invention also relates to neutron detectors based on epitaxially grown hBN thin films (or epitaxial layers) and hBN stacked thin films (or epitaxial layers) to satisfy the thickness required for capturing all incoming neutrons.

Abstract: The present invention relates to optoelectronic device layer structures, light emitting devices, and detectors based upon heterostructures formed between hexagonal boron nitride (hNB) and III-nitrides, and more particularly, to heterojunction devices capable of emitting and detecting photons in the ultraviolet (UV) and extremely ultraviolet (RUV) spectral range. The present invention also relates to neutron detectors based on epitaxially grown hBN thin films (or epitaxial layers) and hBN stacked thin films (or epitaxial layers) to satisfy the thickness required for capturing all incoming neutrons.

Abstract: A high operating temperature split-off band infrared (SPIP) detector having a double and/or graded barrier on either side of the emitter is provided. The photodetector may include a first and second barrier and an emitter disposed between the first and second barriers so as to form a heterojunction at each interface between the emitter and the first and second barriers, respectively. The emitter may be of a first semiconductor material having a split-off response to optical signals, while one of the first or the second barriers may include a double barrier having a light-hole energy band level that is aligned with the split-off band energy level of the emitter. In addition, the remaining barrier may be graded.

Abstract: Disclosed is a photoelectric conversion device which inhibits characteristic degradation caused by crystal defects, and an inspection method for crystal defects in photoelectric conversion devices. The photoelectric conversion device is provided with an active layer, and a deactivator contained in the active layer.

Abstract: A method of making a two-dimensional detector array (and of such an array) comprising, for each of a plurality of rows and a plurality of columns of individual detectors, forming an n-doped semiconductor photo absorbing layer, forming a barrier layer comprising one or more of AlSb, AlAsSb, AlGaAsSb, AlSb, AlGaPSb, and HgZnTe, and forming an n-doped semiconductor contact area.

Abstract: There is disclosed ultrahigh-efficiency single- and multi-junction thin-film solar cells. This disclosure is also directed to a substrate-damage-free epitaxial lift-off (“ELO”) process that employs adhesive-free, reliable and lightweight cold-weld bonding to a substrate, such as bonding to plastic or metal foils shaped into compound parabolic metal foil concentrators. By combining low-cost solar cell production and ultrahigh-efficiency of solar intensity-concentrated thin-film solar cells on foil substrates shaped into an integrated collector, as described herein, both lower cost of the module as well as significant cost reductions in the infrastructure is achieved.

Abstract: A method of forming a solar cell including: providing a semiconductor body including at least one photoactive junction; forming a semiconductor contact layer composed of GaAs deposited over the semiconductor body; and depositing a metal contact layer including a germanium layer and a palladium layer over the semiconductor contact layer so that the specific contact resistance is less than 5×10?4 ohms-cm2.

Abstract: A method of making a two-dimensional detector array (and of such an array) comprising, for each of a plurality of rows and a plurality of columns of individual detectors, forming an n-doped semiconductor photo absorbing layer, forming a barrier layer comprising one or more of AlSb, AlAsSb, AlGaAsSb, AlPSb, AlGaPSb, and HgZnTe, and forming an n-doped semiconductor contact area.

Abstract: Disclosed is a photoelectric conversion device which inhibits characteristic degradation caused by crystal defects, and an inspection method for crystal defects in photoelectric conversion devices. The photoelectric conversion device is provided with an active layer, and a deactivator contained in the active layer.

Abstract: A chemical bath deposition method and a system are presented to prepare different thin films on plane substrates. In particular, they are useful to deposit CdS or ZnS buffer layers in manufacture of thin film solar cells. This method and the deposition system deposit thin films onto vertically travelling plane workpieces delivered by a conveyor belt. The thin films are deposited with continuously spraying the reaction solutions from their freshly mixed styles to gradually aged forms until the designed thickness is obtained. The substrates and the solutions are heated to a reaction temperature. During the deposition processes, the front surfaces of the substrates are totally covered with the sprayed solutions but the substrate backsides are remained dry. The reaction ambience inside the reactor can be isolated from the outside atmosphere. The apparatus is designed to generate a minimum amount of waste solutions for chemical treatments.

Abstract: A resonant tunneling device includes a first semiconductor material with an energy difference between valence and conduction bands of Eg1, and a second semiconductor material with an energy difference between valence and conduction bands of Eg2, wherein Eg1 and Eg2 are different from one another. The device further includes an energy selectively transmissive interface connecting the first and second semiconductor materials.

Abstract: A method for joining a film onto a substrate comprises: a step (A) of floating the film on an interface between an aqueous liquid and a water-insoluble liquid; a step (B) of immersing the substrate into the aqueous liquid; a step (C) of stacking the substrate onto said one surface of the film in the aqueous liquid; a step (D) of immersing the stacked substrate and film into the water-insoluble liquid with maintaining the substrate being stacked on the film to adhere the film to the substrate; and a step (E) of drawing up the stacked substrate and film from the water-insoluble liquid with maintaining the substrate being stacked on the film to join the film onto the substrate.

Abstract: A method of fabrication of barrier diode based infrared detectors, utilizing the growth of unstrained, not relaxed III-V compound semiconductor material layers having a lattice constant over 6 Angstrom, is provided. The growth is performed by the means of Molecular Beam Epitaxy (MBE) or Metal-Organic Vapor Phase Epitaxy (MOVPE). The method comprises the use of bulk crystalline substrates and the growth of a transitional layer of GaInAsSb with graded composition, followed by an optional thick layer of GaInAsSb of constant composition, lattice matched to the said III-V compound semiconductor material layers, the said optional layer of GaInAsSb of constant composition serving as a virtual substrate. The method provides high crystalline quality layers suitable for semiconductor device fabrication that can effectively interact with electromagnetic radiation of the mid-infrared spectral range with a wavelength between about 2 micrometers to about 16 micrometers.

Abstract: Photovoltaic cells with one or more subcells are provided with a wide band gap, pseudomorphic window layer of at least 15 nm in thickness and with an intrinsic material lattice constant that differs by at least 1% from an adjacent emitter layer. This window layer has a higher band gap than a window layer with substantially the same intrinsic material lattice constant as the adjacent emitter layer, which increases the light transmission through the window, thereby increasing the current generation in the solar cell. The quality of being pseudomorphic material preserves a good interface between the window and the emitter, reducing the minority carrier surface recombination velocity. A method is provided for building a wide band gap, pseudomorphic window layer of a photovoltaic cell that has an intrinsic material lattice constant that differs by at least 1% from the adjacent emitter layer.

Abstract: A III-nitride photovoltaic device structure and method for fabricating the III-nitride photovoltaic device that increases the light collection efficiency of the III-nitride photovoltaic device. The III-nitride photovoltaic device includes one or more III-nitride device layers, and the III-nitride photovoltaic device functions by collecting light that is incident on the back-side of the III-nitride device layers. The III-nitride device layers are grown on a substrate, wherein the III-nitride device layers are exposed when the substrate is removed and the exposed III-nitride device layers are then intentionally roughened to enhance their light collection efficiency. The collection of the incident light via the back-side of the device simplifies the fabrication of the multiple junctions in the device. The III-nitride photovoltaic device may include grid-like contacts, transparent or semi-transparent contacts, or reflective contacts.

Abstract: An embodiment of this invention utilizes ZnO rods as the etching mask to etch a GaN layer arranged below, so that GaN rods are formed. The GaN rods have similar patterns as the ZnO rods. The pattern, size, position, and height of the GaN rods are respectively controlled by the pattern, size, position, and height of the ZnO rods.

Abstract: A photoconductor comprising a layer stack with a semiconductor layer photoconductive for a predetermined wavelength range between two semiconductor boundary layers with a larger band gap than the photoconductive semiconductor layer on a substrate, wherein the semiconductor boundary layers comprise deep impurities for trapping and recombining free charge carriers from the photoconductive semiconductor layer, and two electrodes connected to the photoconductive semiconductor layer, for lateral current flow between the electrodes through the photoconductive semiconductor layer.

Abstract: A photo-semiconductor device comprises a photoconductive semiconductor film provided with electrodes and formed on a second substrate, the semiconductor film being formed by epitaxial growth on a first semiconductor substrate different from the second substrate, the second substrate being also provided with electrodes, the electrodes of the second substrate and the electrodes of the photoconductive semiconductor film being held in contact with each other.

Abstract: A method for joining a film onto a substrate comprises: a step (A) of floating the film on an interface between an aqueous liquid and a water-insoluble liquid; a step (B) of immersing the substrate into the aqueous liquid; a step (C) of stacking the substrate onto said one surface of the film in the aqueous liquid; a step (D) of immersing the stacked substrate and film into the water-insoluble liquid with maintaining the substrate being stacked on the film to adhere the film to the substrate; and a step (E) of drawing up the stacked substrate and film from the water-insoluble liquid with maintaining the substrate being stacked on the film to join the film onto the substrate.

Abstract: The present invention utilizes epitaxial lift-off in which a sacrificial layer is included in the epitaxial growth between the substrate and a thin film III-V compound solar cell. To provide support for the thin film III-V compound solar cell in absence of the substrate, a backing layer is applied to a surface of the thin film compound solar cell before it is separated from the substrate. To separate the thin film compound solar cell from the substrate, the sacrificial layer is removed as part of the epitaxial lift-off. Once the substrate is separated from the thin film III-V compound solar cell, the substrate may then be reused in the formation of another thin film compound solar cell.

Abstract: A semiconductor light-detecting element includes: a semiconductor substrate of a first conductivity type; a light absorption recoupling layer of the first conductivity type, a multilayer reflection film of the first conductivity type, a light absorbing layer, and a window layer, which are laminated, in that order, on the semiconductor substrate; a doped region of a second conductivity type in part of the window layer; a first electrode connected to the doped region; and a second electrode connected to an underside of the semiconductor substrate. The band gap energy of the window layer is larger than the band gap energy of the light absorbing layer, and the band gap energy of the light absorption recoupling layer is smaller than the band gap energy of the semiconductor substrate.

Abstract: A method of making a two-dimensional detector array (and of such an array) comprising, for each of a plurality of rows and a plurality of columns of individual detectors, forming an n-doped semiconductor photo absorbing layer, forming a barrier layer comprising one or more of AlSb, AlAsSb, AlGaAsSb, AlPSb, AlGaPSb, and HgZnTe, and forming an n-doped semiconductor contact area.

Abstract: A photodetector for detecting infrared light in a wavelength range of 3-25 ?m is disclosed. The photodetector has a mesa structure formed from semiconductor layers which include a type-II superlattice formed of alternating layers of InAs and InxGa1-xSb with 0?x?0.5. Impurity doped regions are formed on sidewalls of the mesa structure to provide for a lateral conduction of photo-generated carriers which can provide an increased carrier mobility and a reduced surface recombination. An optional bias electrode can be used in the photodetector to control and vary a cut-off wavelength or a depletion width therein. The photodetector can be formed as a single-color or multi-color device, and can also be used to form a focal plane array which is compatible with conventional read-out integrated circuits.

Abstract: A solar cell includes a graphite substrate, an amorphous carbon layer having a thickness of not less than 20 nm and not more than 60 nm formed on the graphite substrate, an AlN layer formed on the amorphous carbon layer, a n-type nitride semiconductor layer formed on the AlN layer; a light-absorption layer including a nitride semiconductor layer formed on the n-type nitride semiconductor layer; a p-type nitride semiconductor layer formed on the light-absorption layer; a p-side electrode electrically connected to the p-type nitride semiconductor layer; and an n-side electrode electrically connected to the n-type nitride semiconductor layer. The amorphous carbon layer is obtained by oxidizing the surface of the graphite substrate.

Abstract: A light detection system is disclosed. The system comprises a light absorbing layer made of a semiconductor having majority carriers and minority carriers, and being incorporated with bandgap modifying atoms at a concentration selected so as to allow generation of photocurrent indicative of absorption of photons at any wavelength at least in the range of from about 3 ?m to about 5 ?m.

Abstract: Embodiments of detectors made using lattice matched photoabsorbing layers are disclosed. A photodiode apparatus in accordance with one or more embodiments of the present invention comprises an indium phosphide substrate, and a photoabsorbing region comprising at least an indium gallium arsenide antimonide nitride (InGaAsSbN) layer, wherein the InGaAsSbN layer has a thickness of at least 100 nanometers and is nominally lattice-matched to the indium phosphide substrate.

Abstract: A method of processing an epistructure or processing a semiconductor device including associating a conformal and flexible handle with the epistructure and removing the epistructure and handle as a unit from the parent substrate. The method further includes causing the epistructure and handle unit to conform to a shape that differs from the shape the epistructure otherwise inherently assumes upon removal from the parent substrate. A device prepared according to the disclosed methods.

Abstract: An improved photoconductive switch having a SIC or other wide band gap substrate material, such as GaAs and field-grading liners composed of preferably SiN formed on the substrate adjacent the electrode perimeters or adjacent the substrate perimeters for grading the electric fields.

Abstract: A dual band photodetector for detecting infrared and ultraviolet optical signals is disclosed. Aspects include homojunction and heterojunction detectors comprised of one or more of GaN, AlGaN, and InGaN. In one aspect ultraviolet/infrared dual-band detector is disclosed that is configured to simultaneously detect UV and IR.

Abstract: A method is provided for producing a thin-film device such as a photovoltaic device. The method begins by forming at least one semiconductor device on a first substrate. At least one secondary substrate having a plurality of indentations is attached to the at least one semiconductor device. The at least one semiconductor device is separated from the at least one first substrate.

Abstract: A method for fabricating a back-side illuminated image sensor includes providing a semiconductor substrate having a front surface and back surface, providing a plurality of transistors, metal interconnects, and metal pads on front surface of the substrate, bonding a supporting layer to the front surface of the substrate, thinning-down the semiconductor substrate from the back surface, clearing-out a region of the semiconductor substrate from the back surface that covers a fine alignment mark by performing registration from the back surface and using a global alignment mark as a reference, and processing the back surface of the substrate by performing registration from the back surface and using the fine alignment mark as a reference.

Abstract: A method and apparatus for solar cell having graded energy wells is provided. The active region of the solar cell comprises nanostructures. The nanostructures are formed from a material that comprises a III-V compound semiconductor and an element that alters the band gap of the III-V compound semiconductor. For example, the III-V compound semiconductor could be gallium nitride (GaN). As an example, the “band gap altering element” could be indium (In). The concentration of the indium in the active region is non-uniform such that the active region has a number of energy wells, separated by barriers. The energy wells may be “graded”, by which it is meant that the energy wells have a different band gap from one another, generally increasing or decreasing from one well to another monotonically.

Abstract: An inverted PCRAM cell is formed by plating the bottom electrode, made of copper for example, with a conductive material, such as silver. Chalcogenide material is disposed over the plated electrode and subjected to a conversion process so that ions from the plated material diffuse into the chalcogenide material.