63results about How to "Good light absorption properties" patented technology

A semiconductor photodiode includes a semiconductor substrate; a first conduction type first semiconductor layer formed above the semiconductor substrate; a high resistance second semiconductor layer formed above the first semiconductor layer; a first conduction type third semiconductor layer formed above the second semiconductor layer; and a second conduction type fourth semiconductor layer buried in the second semiconductor layer, in which the fourth semiconductor layer is separated at a predetermined distance in a direction horizontal to the surface of the semiconductor substrate.

A semiconductor photodiode device includes a semiconductor substrate, a first buffer layer containing a material different from that of the semiconductor substrate in a portion thereof, a first semiconductor layer formed above the buffer layer and having a lattice constant different from that of the semiconductor substrate, a second buffer layer formed above the first semiconductor layer and containing an element identical with that of the first semiconductor layer in a portion thereof, and a second semiconductor layer formed above the buffer layer in which a portion of the first semiconductor layer is formed of a plurality of island shape portions each surrounded with an insulating film, and the second buffer layer allows adjacent islands of the first semiconductor layer to coalesce with each other and is in contact with the insulating film.

The invention provides an ultraviolet cut material whose main ingredient is zinc oxide particulates 1 adulterated with indium, the particulates contain solid solution having crystal structure of aeonite, the half-value width of diffraction peak of X ray diffraction surface (110)'s diffraction angle 2theta is between 0.4~0.1 degrees. The invention can provide ultraviolet cut material and ultraviolet cut filter F and so on, because the aeonite crystal structure of zinc oxide particulates 1 adulterated with indium is restricted in the range especially prescribed by X ray diffraction, the cutoff wavelength's temperature dependency is improved, especially the absorption characteristic of ultraviolet and blue light under high temperature condition is improved. The ultraviolet cut filter is applicable for discharge lamp such as high voltage discharge lamp as well as lighting apparatus.

The invention relates to solar cells, in particular to a preparation method of a flexible substrate silicon nanowire heterojunction solar cell. Excellent light absorbing characteristics of silicon nanowires are brought into full play. The preparation method includes utilizing a wet etching process to prepare a monocrystalline silicon nanowire array on a monocrystalline silicon substrate, adopting a copper electroconductive adhesive tape to transfer silicon nanowires on copper foil, and preparing a silicon nanowire cell. Being different from a method that a silicon nanowire array on a monocrystalline silicon substrate is directly utilized to prepare a cell, the preparation method sequentially includes the steps of transferring the silicon nanowires on a flexible substrate and preparing the silicon nanowire cell, so that the monocrystalline silicon substrate can be repeatedly used, silicon consumption is reduced, and material cost is saved.

The invention discloses an inverted planar heterojunction hybrid perovskite solar cell and a preparation method thereof. According to the invention, an inverted planar heterojunction structure solar cell is adopted, a transparent electrode and silver are respectively used as an anode and a cathode, poly (triarylamine) is used as a hole transport layer, a fullerene derivative PC61BM is used as an electron transport layer, and polyvinylpyrrolidone is used as a perovskite passivation layer. According to the invention, polyvinylpyrrolidone can effectively passivate the grain boundary of perovskite; the surface defects of the perovskite are reduced, the series resistance of the perovskite cell is reduced, the filling factor and the current density of the solar cell are improved, the photoelectric conversion efficiency of the solar cell is finally improved, and the performance of the modified and passivated perovskite solar cell is greatly improved compared with the performance of an unpassivated device. The preparation method is simple in process operation, high in repeatability, low in cost and suitable for preparation and large-scale application of various planar heterojunction perovskite solar cells.

An organic photoelectronic device includes a first electrode and a second electrode facing each other, and an active layer between the first electrode and the second electrode and including a first compound represented by Chemical Formula 1 or 2, and a ratio between a FWHM of a light absorption curve depending on a wavelength of the first compound in a solution state and in a thin film state satisfies the following Relationship Equation 1: FWHM2/FWHM1<2.5. In the Relationship Equation 1, FWHM1 is a FWHM of the light absorption curve depending on a wavelength in a solution state, and FWHM2 is a FWHM of the light absorption curve depending on a wavelength in a thin film state.

The invention provides an organic rare earth complex NH4[Eu(C7H6O3)4(phen)2] and a preparation method thereof and application of the organic rare earth complex serving as a photoluminescent material. According to the organic rare earth complex, a europium ion is adopted as a coordination center atom, salicylic acid and 1,10-phenanthroline serve as organic ligands, lowest triplet energy levels of the organic ligands can be well matched with the resonance emission energy level of the europium ion, the organic rare earth complex has a good light absorption property in the ultraviolet region and has a high fluorescence quantum yield under the excitation of ultraviolet light, and therefore the organic rare earth complex has a good light conversion property; it is shown through X-ray diffraction testing results that the component and structure of the organic rare earth complex are definite; the organic rare earth complex NH4[Eu(C7H6O3)4(phen)2] can adsorb the ultraviolet light with the wavelength ranging from 200 nm to 400 nm and converts the ultraviolet light into visible light with the wavelength of 618 nm.

The invention discloses a thieno (2, 3-f) benzofuran compound, polymers thereof and an application of the polymers. A series of polymers with thieno (2, 3-f) benzofuran compound unit structures are synthesized from the thieno (2, 3-f) benzofuran compound, benzothiadiazole, benzotriazole, benzoxadiazole and other monomers through a Stille coupling polymerization method. The polymers have good thermal stability and electrochemical performance and can be mixed with commonly used fullerene and organic acceptor substances to prepare polymer solar cells with high photoelectric conversion rate, the photoelectric conversion efficiency of single-layer polymer solar cell devices can be as high as 6.4%, and the polymer materials have huge commercial prospects in application of the solar cells.

The invention discloses an Ag/BiO2-x/Bi2O3/Bi2O2.75 composite photocatalyst, a preparation method and application. NaBiO3 is added into a NaOH solution and then is dispersed to water to obtain a reaction precursor solution, and Bi2O2.75/BiO2-x is prepared through hydrothermal reaction; the Bi2O2.75/BiO2-x is dispersed in water, and stirring is performed under natural lighting condition to obtain turbid liquid A; AgNO3 is dispersed into the water to obtain a solution B; the solution B is dispersed into the turbid liquid A, and Ag/BiO2-x/Bi2O3/Bi2O2.75 is obtained under natural lighting condition. The Ag/BiO2-x/Bi2O3/Bi2O2.75 composite photocatalyst has oxygen vacancies, the synergistic resonance effect of the oxygen vacancies and surface plasmons of precious metals Ag makes the photocatalyst respond to a complete solar spectrum, and the photocatalyst is used for catalytic degradation of organic pollutants.

The invention provides a perovskite solar cell having a compact film of a silver/titanium dioxide nanometer composite material, and is simple in preparation method and high in energy conversion efficiency. The perovskite solar cell includes an FTO conductive substrate, a compact layer, a mesoporous layer, a perovskite layer and a carbon pair electrode layer which are superimposed in sequence, the compact layer adopts the silver/titanium dioxide nanometer composite material, silver nitrate and titanium isopropylate are mixed to obtain a precursor solution, and the precursor solution is coated on FTO conductive glass in a spinning mode and subjected to high-temperature sintering, thereby obtaining the silver/titanium diode nanometer composite material.

The invention discloses a super black material and a preparation method and application thereof, and belongs to the technical field of nanometer material preparation. The super black material is composed of a base copper nanometer cluster and a graphitized carbon layer supported on the surface thereof, and the super black material forms the core-shell structure and is composed of, by weight: 51.9%to 84.3% of the copper nanometer cluster and 15.7% to 48.1% of carbon. By using the copper 4-pentanedionate hydrate as an elementary material, the super black material and preparation method and application thereof coats the surface of the copper nanometer cluster with the graphitized carbon layer to form a unique core-shell structure. The obtained super black material is characterized by excellent light absorption, and has significant optical loss effect caused by surface effect and quantum effect. The absorption range of the copper nanometer cluster or the super-black carbon material is soextensive that the copper nanometer cluster or the super-black carbon material has good light absorption performance at the wavelength of 200-900 nm; and the preparation method of the super black material is easy to operate, low in cost of finished products and process cost and conducive to industrial production, and the process conditions are easy to control.

The present invention provides a preparation method of a lead-free tin-based halide perovskite thin-film solar cell. The preparation method is characterized by comprising the following steps: step one, dissolving a tin-based source compound, an organic and inorganic source halide and a polyphenyl aromatic amine compound in a mixed polar solvent in advance, at the same time adding tin fluoride as an antioxidant, and preparing a precursor solution; and step two, spin-coating the perovskite precursor solution on a prepared substrate plate, and then conducting an annealing treatment after the spin-coating is completed to obtain the tin-based halide perovskite thin film. The lead-free tin-based halide perovskite thin film has advantages of being good in film forming property, high in crystallinity and good in stability, and the lead-free perovskite solar cell which is friendly to environment and relatively high in stability and photoelectric conversion efficiency can be prepared based on the lead-free tin-based halide perovskite thin film.

The invention relates to the technical field of superlattice magneto-optical materials, in particular to a superlattice material as well as a preparation method and application thereof. According to the record of an embodiment, the superlattice material provided by the invention has both the relatively good magnetic property of a ferrous garnet material and the good photoelectric absorption property of graphene and other two-dimensional semiconductor materials; magneto-optical Kerr effect data acquired through testing indicate that the magneto-optical Kerr angle of the superlattice material ina magnetic field of 2500 Oe reaches 13 mdeg; and compared with a non-superlattice ferrous magnetic thin film material without the insertion of a two-dimensional material, the superlattice material has the advantages that the magneto-optical Kerr angle is increased by 2.5 times and the magneto-optical effect is enhanced.

The invention discloses an efficient and stable planar heterojunction perovskite solar cell and a preparation method thereof, an inverted perovskite solar cell structure is adopted, a transparent conductive material and silver are respectively used as an anode and a counter electrode, PCBM is used as an electron transport layer, and polyoxyethylene is used to modify a perovskite/electron transportlayer interface; polyoxyethylene adopted in the perovskite solar cell can effectively increase electron transmission between perovskite and the electron transport layer interface, reduce the serial resistance and increase a fill factor and current density of the perovskite solar cell so as to improve the photoelectric conversion efficiency of the perovskite solar cell. The efficiency of the wholedevice is obviously improved compared with that of an unmodified perovskite cell; the method is simple in process, low in cost and obvious in effect, can be widely applied to different types of planar heterojunction perovskite solar cells, and can be applied to large-scale production.

A low reflectivity coating (40, 80/82) is provided on a substrate (22). The coating includes a layer of substantially vertically aligned carbon nanotubes (40) on an exposed surface (21) of the substrate. Provided on and extending partially within the carbon nanotube layer (40) is a hydrophobic coating (80, 82), in the preferred embodiment of or containing fluorocarbon. The hydrophobic coating (80, 82) prevents any settling or ingress of water particles onto or into the carbon nanotube layer (40) and as a result increases the stability of the carbon nanotube layer during use (40) whilst improving the low reflectivity of the film.

The invention discloses a method for preparing aluminum oxide ceramic based on sinking type DLP photocuring 3D printing, and the method comprises the following steps of: mixing and stirring aluminum oxide powder, a first dispersing agent and an organic solvent, conducting drying, crushing and sieving to obtain modified aluminum oxide powder, adding graphene, a second dispersing agent and a defoaming agent into acrylic photosensitive resin, performing mixing, then adding modified aluminum oxide powder, carrying out ball milling and defoaming treatment to obtain aluminum oxide ceramic paste, carrying out photocuring 3D printing by adopting a sunken DLP photocuring method, and then carrying out sectional process degreasing treatment and sintering to obtain the aluminum oxide ceramic. The method disclosed by the invention is suitable for preparation and industrial production of the large-size aluminum oxide ceramic piece with low deformation, high precision and complex structure, and the prepared aluminum oxide ceramic has the advantages of few microdefects, high density, good mechanical and physical properties and the like.

The invention discloses a preparation method and application of a multi-pole sub-local area surface plasma resonance absorber. By improving the preparation method of a core shell, the light absorbingcharacteristic of the single nano absorber is improved through a nano composite core shell structure material, and the obtained single multi-pole sub-local area surface plasma resonance absorber has four plasma resonance absorbing peaks within the range of 200-1,300 nm, the absorbing spectrum of the absorber is broadened, the problem that the light absorbing characteristic of the single absorber is difficult to improve is solved, a new method for improving the light absorbing characteristic of the single absorber is created, and a feasible strategy is provided for how to improve the light absorbing characteristic of the single absorber; meanwhile, the comprehensive photothermal performance of the multi-pole sub-local surface plasma resonance absorber is excellent, the sunlight with low energy density can be efficiently captured, high-temperature overheating and photothermal steam can be rapidly and efficiently generated, and the problem that it is difficult to generate high-temperature, fast and efficient photothermal steam at the same time by the photothermal conversion is solved.

The invention discloses a multi-core rare earth doped organic complex light conversion agent and a preparation method thereof, a light conversion master batch and a preparation method and an application thereof. The molecular formula general formula of the prepared multinuclear rare earth doped organic complex light conversion agent is EuxSm1-x-zYzI3L, z is equal to 0.01-0.3, and x+z is equal to 1. The obtained multi-core rare earth doped organic complex light conversion agent is stable in structure and high in weather resistance; the light conversion master batch prepared from the light conversion agent is used in a light conversion agricultural film, can absorb ultraviolet light of 200-400 nm and convert the ultraviolet light into red orange light with the wavelength of 620-650 nm, can effectively promote growth and development of crops and improve the yield, so that the crops, fruits and vegetables can be harvested in advance, and the quality of the crops, fruits and vegetables can be improved; and the defects of an existing common agricultural film are effectively overcome.

The invention discloses a BiO2-x/Bi2O2.75/Zn2SnO4 composite photocatalyst, a preparation method and the application thereof. The preparation method comprises the steps of adding NaBiO3 to a NaOH solution and stirring uniformly to obtain a solution A; dispersing the solution A into water, adding Zn2SnO4 and mixing uniformly to obtain a reaction precursor solution; and hydrothermally reacting the reaction precursor solution to obtain the BiO2-x/Bi2O2.75/Zn2SnO4 composite photocatalyst. The BiO2-x/Bi2O2.75/Zn2SnO4 composite photocatalyst has oxygen vacancies, and the oxygen vacancies can broadenthe photoresponse of the catalyst to the near infrared range and the far infrared range; the Zn2SnO4 is closely attached to the surface of the bismuth oxide, and can form a cross energy band structurewith the bismuth oxide compound, thereby improving the separation efficiency of current carriers, and improving the reactivity of the photocatalyst.

The invention discloses photo-curing equipment. The photo-curing equipment comprises an objective table arranged in a light shading cover, a mould or a material slot formed in the objective table, a light source 4 which is suspended on the mould or above the material slot, a light source conversion module which can be connected to the light source to realize conversion among multiple specific-wavelength light sources, a light source lifting module which realizes light source spatial position regulation, a light source translation module, a light source rotation module, a light intensity meterwhich is suspended on the mould or above the material slot, a light intensity meter lifting module which realizes light intensity meter spatial position regulation, a light intensity meter translationmodule and a light intensity meter rotation module, an electrical control system box which supplies power to the light source and the light intensity meter, and realizes light source and light intensity meter spatial position regulation to control signal resolution and transmission, and an air cooler which is positioned outside the light shading cover to output cooling capacity for light source cooling. The photo-curing equipment realizes an efficient curing target through precise control on multi-light-source conversion and light source height according to different light absorption characteristics and different curing depth requirements of different photo-curing material systems.