128 results about "Indium arsenide" patented technology

A device for harmonizing a laser beam path with an observation path for a target includes a laser that generates a laser beam; a first optical element that directs a first part of the laser beam toward the target along the laser beam path while directing a second part of the laser beam toward a conversion device; and a second optical element that directs a converted beam from the conversion device to a sensor that receives the converted beam and an image from the target. The conversion device includes a photoluminescent material that converts the second part of the laser beam into a converted radiation having a wavelength within a spectral band of the sensor, and an optical assembly that focuses the second part of the laser beam into the photoluminescent material and that collects at least a portion of the converted radiation to form the converted beam. The photoluminescent material can include photoluminescent ions such as erbium ions, or a semiconductor material such as indium arsenide. The photoluminescent material can include two materials, wherein the first material has a photoluminescence lifetime greater than a pulse duration of the pulsed laser beam, and the second material has an emission spectrum of photoluminescence covering at least a portion of a sensitivity spectral band of the sensor. The conversion device can also include a non-linear material that frequency converts the second part of the laser beam into an intermediary radiation having a wavelength shorter than the laser beam, and where the photoluminescent material converts the intermediary radiation into the converted radiation.

A polishing composition contains at least abrasive grains and water and is used in polishing an object to be polished formed of a substrate material for optical devices, a substrate material for power devices, or a compound semiconductor material. The abrasive grains have a zeta potential satisfying the relationship X×Y≦0, where X [mV] represents the zeta potential of the abrasive grains measured in the polishing composition and Y [mV] represents the zeta potential of the object to be polished measured during polishing using the polishing composition. The abrasive grains are preferably of aluminum oxide, silicon oxide, zirconium oxide, diamond, or silicon carbide. The object to be polished is preferably of sapphire, gallium nitride, silicon carbide, gallium arsenide, indium arsenide, or indium phosphide.

The present invention provides high quality monodisperse or substantially monodisperse InAs nanocrystals in the as-prepared state. In some embodiments, the as-prepared substantially monodisperse InAs nanocrystals demonstrate a photoluminescence of between about 700 nm and 1400 nm.

An embodiment of the present invention improves the fabrication and operational characteristics of a type-II superlattice material. Layers of indium arsenide and gallium antimonide comprise the bulk of the superlattice structure. One or more layers of indium antimonide are added to unit cells of the superlattice to provide a further degree of freedom in the design for adjusting the effective bandgap energy of the superlattice. One or more layers of gallium arsenide antimonide are added to unit cells of the superlattice to counterbalance the crystal lattice strain forces introduced by the aforementioned indium antimonide layers.

The invention provides an aluminum-free active region 808nm high-power quantum-well laser with asymmetric structure. From the bottom to the top, the structure of the laser sequentially comprises a substrate, a buffer layer, an N-type lower limiting layer, a lower waveguide layer, a quantum-well layer, an upper waveguide layer, a potential barrier limiting layer, a P-type upper limiting layer, a transition layer and an ohmic contact layer, wherein, the upper waveguide layer and the lower waveguide layer are made of aluminum-free material Indium gallium phosphide, the quantum-well layer made of gallium indium arsenide phosphide material, the waveguide layer and the quantum-well layer form the aluminum-free active region, and one layer potential barrier limiting layer which is made of P-type aluminum gallium indium phosphide material and 50nm-150nm thick and has a band gap wider than that of the upper limiting layer is arranged between the upper limiting layer and the upper waveguide layer. The laser of the invention can increase the optical limiting factor of the P-type material region, reduce the optical leakage towards the P-type material region, reduce optical absorption loss of a current carrier at the highly doped area, and improve the work efficiency of the laser; the structure of the invention also improves the limiting effect of the active region on the carrier, reduce the leakage of the carrier and is favorable to the decrease of the threshold current.

The invention discloses a method for producing a very-long wave indium arsenide (InAs)/gallium antimonide (GaSb) second class superlattice infrared detector material, which comprises the step that: a P type doped GaSb buffer layer, a P type doped medium wave InAs/GaSb second class superlattice layer, a non-doped very-long wave InAs/GaSb second class superlattice layer, a N type doped medium wave InAs/GaSb second class superlattice layer and an N type doped InAs upper contact layer are sequentially grown on a semi-insulating GaSb substrate, so the very-long wave InAs/GaSb second class superlattice infrared detector material is obtained. After the method is utilized, because 'Sb-soak' and 'grow interruption' which are well designed are added in an interface design, the quality of the superlattice material is further improved.

The invention discloses a method for growing indium arsenide/indium gallium arsenide quantum well material on an indium phosphide substrate. The method comprises the following steps of: 1, selecting the substrate; and 2, sequentially growing a buffer layer, a lower waveguide layer, a dual-quantum well structure, an upper waveguide layer and a cover layer to finish growing the indium arsenide/indium gallium arsenide quantum well material on the indium phosphide substrate. In the method, an InAs quantum well with a proper thickness is grown at relatively lower temperature to realize the functions of reducing shortcomings and increasing a transition wavelength to 2.3 mu m under high strain condition.

The invention provides an indium arsenide antimony and indium gallium arsenide antimony two-waveband infrared detector and a manufacturing method thereof. The indium arsenide antimony and indium gallium arsenide antimony two-waveband infrared detector structurally comprises a GaSb substrate, a first GaSb buffer layer grown on the GaSb substrate, an InGaAsSb PIN type short-wave device grown on the first GaSb buffer layer, a second GaSb buffer layer grown on the InGaAsSb PIN type short-wave device and an InAsSb NIP type middle-wave device grown on the second GaSb buffer layer. The indium arsenide antimony and indium gallium arsenide antimony two-waveband infrared detector can realize signal detection on an infrared middle-wave waveband and a short-wave waveband.

This invention relates to a chemical corrosive with high selectivity towards gallium arsenide among gallium arsenide/aluminium arsenide mixture. It uniquely contains citric acid solution and oxydol with a volume ratio of 4:1 and is compatible with gallium arsenide integration technique. Besides, it also has the advantages of nontoxic solution and simple technique.

Disclosed is a method for manufacturing an active area of a broadband spectrum indium arsenide/indium phosphide quantum dot laser. The method for manufacturing the active area of the broadband spectrum indium arsenide/indium phosphide quantum dot laser includes following steps: step 1, selecting an indium phosphide substrate; step 2, growing an indium phosphide buffer layer on the indium phosphide substrate; step 3, growing an indium gallium arsenide phosphide thin layer with matched lattices on the indium phosphide buffer layer; step 4, preparing a polycyclic indium arsenide quantum dot active layer on the indium gallium arsenide phosphide thin layer, setting the indium gallium arsenide phosphide thin layer as a lower barrier layer of the indium arsenide quantum dot active layer; step 5, depositing an indium gallium arsenide phosphide cover layer on the indium arsenide quantum dot active layer, and setting the indium gallium arsenide phosphide cover layer as an upper barrier layer of the indium arsenide quantum dot active layer. The method for manufacturing the active area of the broadband spectrum indium arsenide/indium phosphide quantum dot laser regulates and controls the height of quantum dots by changing the thickness of the first cover layer, obtains different light wavelengths in different periods, and achieves good optical performance and luminescence spectrum larger than 300nm in width by enabling the polycyclic quantum dots to simultaneously emit light.

A type of damp corrupting method of gallium arsenide/aluminium arsenide distributing Prague reflector that characterized in that it includes following steps: (A) on the underlay, the gallium arsenide cushion layer is generated extendedly by method of molecule beam extension; (B) generating several period distribution Prague reflector on the gallium arsenide cushion layer; (C) photoetching the distribution Prague reflector to form photosensitive resist pattern, light possesses width of photosensitive resist in the photosensitive resist pattern; (D) eating off the part of the distribution Prague reflector by cauterization solution; (E) cauterization solution and selective cauterization solution are alternatively used to etch the distribution Prague reflector, so the required cauterization depth can be achieved precisely.

Provided is a polishing composition containing an abrasive and water. The abrasive content in the polishing composition is no less than 0.1% by mass. The abrasive contains zirconium oxide particles. The zirconium oxide particles have a specific surface area of from 1 to 15 m²/g. The zirconium oxide particles preferably have a purity of no less than 99% by mass. The polishing composition is used in, for example, polishing a hard and brittle material, such as sapphire, silicon nitride, silicon carbide, silicon oxide, glass, gallium nitride, gallium arsenide, indium arsenide, and indium phosphide.

The invention discloses a complementary cmos structure and a method thereof. Selective deposition techniques are used to form a column having a lower portion that includes one type of semiconductor (e.g. germanium) and an upper portion of another type of semiconductor (e.g. indium arsenide. The lower portion of the column provides a channel region for a transistor of one type, while the upper column provides a channel region for a transistor of another type. This provides a complementary pair that occupies a minimum of integrated circuit surface area. The complementary transistors can be utilized in a variety of circuit configurations. Described are complementary transistors where the lower transistor is p-type and the upper transistor is n-type. The method is advantageous in that complementary transistors are provided, wherein the complementary transistors employ a minimum integrated circuit superficial area.

The invention discloses a quantum dot hybrid transparent polyimide fluorescent film and a preparation method. The quantum dot hybrid transparent polyimide fluorescent film comprises 0.0001-2.0wt% of quantum dots, 85-99wt% of polyimide and 0-5wt% of additive. The quantum dots are one or more of carbon quantum dots, silicon quantum dots, germanium quantum dots, cadmium sulfide quantum dots, cadmiumselenide quantum dots, cadmium telluride quantum dots, zinc selenide quantum dots, lead sulfide quantum dots, lead selenide quantum dots, indium phosphide quantum dots and indium arsenide quantum dots. Polyimide is prepared by polymerization and imidization reaction of alicyclics, a fluorine-containing bifunctional (multifunctional) organic acid anhydride monomer and an organic amine monomer. Thequantum dot hybrid polyimide fluorescent film has high light transmittance, high quantum efficiency, low dielectric constant and loss and can be applied to the technical field of LED (light-emitting diode) luminescence and display.

The invention concerns a photodiode array, and the method for producing same, comprising—a cathode comprising at least one substrate layer (4) made from a material from the indium phosphide family and one active layer (5) made from a material from the gallium indium arsenide family, and characterised in that the array further comprises at least two sorts of doped regions of the same type at least partially formed in the active layer (5):—first doped regions (3) forming, with the cathode, photodiodes for forming images,—at least one second doped region (8) absorbing excess charge carriers so as to discharge them.

The invention discloses an InGaAs (Indium Gallium Arsenide) or GaAs (Gallium Arsenide) infrared detector with wide detection bands and belongs to the field of optoelectronic materials and devices. The InGaAs or GaAs infrared detector solves the problem that the performance of the existing InGaAs infrared detectors decreases obviously due to the fact that defects are produced by lattice mismatch. The InGaAs or GaAs infrared detector comprises a buffering layer, an absorbing layer and a covering layer which are grown on a GaAs substrate sequentially; the buffering layer is InAsP (Indium Arsenide Phosphorus) doped with Si (Silicon) and the thickness of the buffering layer is 0.5 to 1.5 microns; the absorbing layer is In0.82Ga0.18As with low doped Si and the thickness of the absorbing layer is 2.5 to 3.5 microns; the covering layer is InAlAs (Indium Aluminum Arsenide) doped with Be (Beryllium) and the thickness of the covering layer is 0.5 to 1.5 microns. The InGaAs or GaAs infrared detector with the wide detection bands has the structure which is high in quantum efficiency and high in detection rate and can meet the requirements of front light entering, back light entering and flip chip packaging.

The invention provides a method for manufacturing an active area of an indium arsenide/indium phosphide quantum dot laser. The method comprises the following steps of: step 1, selecting an indium phosphide substrate; step 2, epitaxially growing an indium phosphide buffering layer on the indium phosphide substrate; step 3, depositing a lattice matched indium-gallium-arsenic-phosphorus thin layer on the indium phosphide buffering layer; step 4, epitaxially growing a multi-periodical indium arsenide quantum dot active layer; and step 5, depositing an indium-gallium-arsenic-phosphorus cover layeron the indium arsenide quantum dot active layer. According to the method provided by the invention, the purposes of keeping good optical properties and tuning the light-emitting wavelength are achieved by changing a five-group protection source flow to restrain an As/P exchange effect, controlling the appearance of a quantum dot and combining a two-step cover layer growth process in a growth pause interval of an indium arsenide/indium phosphide quantum dot. The method provided by the invention can be used for controllably adjusting the InAs/InP quantum dot light-emitting wave in a range of 1.3-1.7 microns (num) to 400 nm.

The invention provides a method for preparing low-density and long-wavelength indium arsenide/gallium arsenide (InAs/GaAs) quantum dots. The method includes a first step of picking up a substrate, a second step of depositing and growing a buffer layer on the substrate, a third step of depositing and growing an InAs layer on the buffer layer, suspending deposition and growth when the InAs layer does not reach the critical thickness, a fourth step of annealing the substrate with the growing InAs layer, a fifth step of rising temperature of the substrate after annealing, a sixth step of growing the InAs layer through secondary deposition, a seventh step of depositing and growing a GaAs cover layer on the InAs layer which grows through the secondary deposition, and obtaining the low-density and long-wavelength InAs/GaAs quantum dot structure. The method can be used for preparing the low-density InAs/GaAs quantum dots with room temperature luminous long-wavelength longer than 1.3 micrometers.

The invention relates to a magnetic random access memory based on an III-V group narrow bandgap semiconductor, the magnetic random access memory is characterized by sequentially comprising a substratewafer, a dielectric layer, a spin orbit torque acting layer and an MTJ structure layer from bottom to top, and the dielectric layer is made of a cadmium telluride CdTe or zinc telluride ZnTe material; and the spin orbit torque acting layer is made of a III-V group narrow bandgap semiconductor indium antimonide InSb or indium arsenide InAs with high mobility. The structure based on the III-V semiconductor material not only can be matched with an existing semiconductor CMOS process, but also can provide spin orbit coupling strength higher than that of a traditional heavy metal SOT material, andtherefore the problem of power consumption of device write-in current is effectively solved. In addition, the spin orbit coupling strength can be regulated and controlled by applying the back gate voltage, so that the power consumption of the device is further improved. And through electric field control, the programmable and storage integrated capability of the modified device array can be improved.