58results about How to "Broaden the spectral absorption range" patented technology

The invention discloses a high-efficient four solar cell and a manufacturing method thereof. The method is characterized by: providing a double-sided polishing substrate, which is used for growing an extension of a semiconductor; forming a first sub-cell on a front side of the substrate so that the first sub-cell possesses a first band gap; forming a gradient buffer layer above the first sub-cell so that the gradient buffer layer possesses a second band gap which is greater than the first band gap; forming a second sub-cell above the gradient buffer layer so that the second sub-cell possesses a third band gap which is greater than the second band gap; forming a high doping cap layer above the second sub-cell; forming a third sub-cell on a back side of the substrate, wherein the third sub-cell grows at an inversed direction and possesses a fourth band gap which is less than the first band gap; forming a fourth sub-cell under the third sub-cell, wherein the fourth sub-cell grows at an inversed direction and possesses a fifth band gap which is less than the fourth band gap; extending to form a back contact layer under the fourth sub-cell and acquiring the needed solar cell. By using the method of the invention, the high-efficient four solar cell with current matching and a wide spectrum absorption scope can be manufactured.

The invention discloses a preparation method of a bacteriostatic air purifier. The preparation method comprises the following steps: step I: acid leaching, calcining, and producing modified maya blue;step II: fermenting various plants by virtue of probiotics, filtering a fermented solution, and preparing plant enzymes; step III: under a condition of argon charged, dissolving zirconium dioxide andtitanium dioxide in tartaric acid, and then preparing a lanthanum-doped composite photocatalyst by virtue of the coupling bonding of lanthanum oxide; step IV: mixing tea polyphenols, quercetin and hydrazine carbonate according to a weight ratio of 1: (1.2 to 1.6): (0.3 to 0.5), condensing by using a coating agent, and preparing a coated synergist; and step V: mixing 20 to 30 parts of modified maya blue, 40 to 60 parts of plant enzymes, 12 to 16 parts of lanthanum-doped composite photocatalyst, and 15 to 20 parts of coated synergist, thus obtaining the air purifier. By adopting the preparationmethod, the pathogenic bacteria can be effectively eliminated, the air spreading route of the pathogenic microorganism can be blocked, the air pollutants can be effectively degraded, and the air quality can be improved.

The invention discloses a preparation method for a titanium dioxide photoelectrode co-modified by carbon dots and carbon nitride, and an application thereof in photoelectrocatalytic decomposition forwater. The preparation method for the titanium dioxide photoelectrode co-modified by the carbon dots and carbon nitride comprises the following steps: (1) preparing TiO2 nanorods on FTO conductive glass through a hydrothermal reaction, and obtaining the titanium dioxide photoelectrode through calcining; (2) soaking the titanium dioxide photoelectrode into a urea aqueous solution, soaking for 10-30minutes, drying, and calcining to obtain a C3N4/TiO2 photoelectrode; and (3) spinning-coating the C3N4/TiO2 photoelectrode with a carbon dot solution, and drying to obtain a CDs/C3N4/TiO2 composite photoelectrode. According to the preparation method and the application, C3N4 is modified onto the surface (C3N4/TiO2) of TiO2 to form a uniform catalytic layer at first, and then prepared carbon dotsare modified onto the surface of the C3N4/TiO2 composite photoelectrode, so that the electrical conductivity of the composite photoelectrode can be effectively improved, and the problem of serious surface charge recombination of TiO2 is reduced; and meanwhile, expansion for the spectral absorption range of TiO2 and increasing for the separation efficiency of charge carriers are realized, so that the photoelectrocatalytic efficiency for TiO2 is increased.

The invention discloses a rare earth ion doped novel perovskite solar cell, and belongs to the field of novel photovoltaic solar cells. The perovskite solar cell device structure sequentially comprises a counter electrode (Au), a hole transport layer (SpiroOMeTAD), a perovskite light absorption layer (Cs2AgBiBr6), an electron transport layer (SnO2) and a transparent conductive glass substrate (ITO) from top to bottom, wherein the rare earth ions are cerium, ytterbium and the like. On the original basis of a traditional FTO/SnO2/Cs2AgBiBr6/Spiro-OMeTAD/Au device structure, rare earth is doped into the Cs2AgBiBr6 perovskite light absorption layer, the forbidden band width can be reduced, the spectral absorption range can be widened, then the photoelectric conversion efficiency of the perovskite solar cell is improved, and the device high-temperature stability is effectively improved.

The application discloses a photocatalyst, a preparation method and application thereof. The photocatalyst comprises citric acid and bismuth oxyhalide, the citric acid is modified on the surface of the bismuth oxyhalide. The chemical formula of the bismuth oxyhalide is BiOX; X is selected from at least one of F, Cl, Br, I and At. The color of the photocatalyst is black. The energy band structure of the photocatalyst has stable oxygen vacancy energy levels between a conduction band and a valence band, so that the photocatalyst has wide spectrum absorption extending to a visible light range, thereby obviously improving the photocatalytic performance and having certain oxidation resistance, thus being capable of maintaining black stability in an oxygen atmosphere environment and a thermal heating environment and ensuring long-period stability of high-efficiency visible photocatalytic performance.

The invention discloses a closed-loop triphenylamine derivative copolymer and a preparing method and application of the closed-loop triphenylamine derivative copolymer. The preparing method includes the steps that a closed-loop triphenylamine unit containing di-pinacol boric-acid-ester groups and a copolymerization unit containing di-bromine groups are reacted for 12-48 hours with a palladium compound serving as a catalyst, organic alkali or inorganic alkali serving as an alkali source and methylbenzene serving as a solvent under protection of inert gas at the temperature of 25-130 DEG C, and finally the closed-loop triphenylamine derivative copolymer is obtained, wherein the molar content of a palladium compound accounts for 0.1-10% of the content of a closed-loop triphenylamine derivative, and the molar concentration of a reactant monomer is between 0.1 mole per liter and 1 mole per liter. By copolymerizing various narrow-band-gap units provided with a donor-acceptor-donor (D-A-D) structure and the closed-loop triphenylamine derivative, narrow-band-gap conjugated polymers with high heat stability and high wide-spectrum absorbing performance are obtained. The closed-loop triphenylamine derivative copolymer prepared through the method serves as a donor material to be applied to polymer solar cells.

The invention discloses thiazole triphenylamine photosensitive dye and a preparation method thereof. The structural formula of the photosensitive dye can be found in the specification, wherein R1 stands for C1-C10 alkyl or C2-C10 alkenyl; Ar stands for a bridge chain constituted by aryl, heterocyclic ring aryl and the like. According to the thiazole triphenylamine photosensitive dye and the preparation method thereof, thiazolone containing electron-rich heteroatoms such as nitrogen, oxygen and sulfur is introduced into a triphenylamine electron donor, electron donating capability of the donor can be improved, the spectral absorption range of the photosensitive dye can be broadened more effectively, and the photosensitive dye can be used for preparing solar cells, contains no precious metal ruthenium, is low in preparation cost and simple in purification method and has a wide application prospect.

The invention belongs to the technical field of polymer solar batteries, and relates to structural design of an efficient co-mixed ternary organic solar battery based on optical waveband absorption. According to the battery, a silver (gold) nanometer matrix is introduced to a ternary system battery, and an electric field is constrained around a micro structure; by exciting a near field effect, theoptical field is almost permeated into an active layer; the active layer is spin coated on a Ag/Au matrix to naturally form a similar micro-nano grating structure; by exciting surface plasma polaritons, the incident light is limited in the active layer; and by adjusting the micro-nano square matrix period, the metal thin film thickness and the like, an enhanced optical absorption effect can be generated within the ultra-wide range of the ultraviolet light, visible light and near infrared region. Meanwhile, a donor polymer and an acceptor with similar chemical structures and complementary spectral absorption are co-mixed into a solution so as to prepare into a film, so that the absorption spectrum is expanded, the open-circuit voltage, the short-circuit current and a filling factor of a device are substantially improved, the energy conversion efficiency is high, the preparation success rate of the device is high, and the preparation complexity of the device is low.

The invention discloses a photocatalytic coating having a ZnO/TiO2 heterostructure and a preparation method of the photocatalytic coating having the ZnO/TiO2 heterostructure. The photocatalytic coating comprises a ZnO stack cluster formed by stacking nano ZnO crystal grains having a diameter of 10 to 50 nm, and nano TiO2 particles embedded in the ZnO stack cluster, wherein the ZnO stack cluster has a cluster structure, has a loose porous structure, and has a diameter of 3 to 30 mum. The photocatalytic coating is prepared by a thermal spraying process in one step, and the morphology and microscopic size of a product are controllable. The photocatalytic coating disclosed by the invention has high binding force with a matrix and has a larger spectral absorption range, and obvious improvementon efficiency of photocatalytic degradation of pollutants such as organic dyes.

The invention provides a polymer, a preparation method thereof and an organic polymer solar battery. The polymer is shown in a formula (I) or a formula (II). Compared with an existing conjugated polymer, the polymer which is shown in the formula (I) or the formula (II) has the advantages that a condensed ring unit of dithieno carbazole serves as a donor and is low in reorganization energy and good in pi electron delocalization; by introducing the condensed ring unit into a conjugated compound, the reorganization energy of the polymer can be effectively reduced, and the conjugation length of the polymer is increased, so that the mobility of the polymer can be improved, and an optical band gap of the polymer is reduced; the optical band gap is reduced to cause the red shift of an absorption band of the polymer, and absorption spectra are matched with solar spectra. Therefore, by the adoption of the polymer, the spectrum absorption range of the polymer can be expanded, and the hole mobility can be improved; fluoro-isoindigo serves as a receptor, so that the highest occupied molecular orbital (HOMO) energy level of the polymer can be reduced, and the open-circuit voltage of the polymer solar battery is improved.

The invention discloses a reverse multi-junction solar battery and a preparation method thereof. The multi-junction solar cell comprises a substrate, a first sub-battery, a second sub-battery, a third sub-battery, a fourth sub-battery, a gradient buffering layer and a fifth sub-battery, wherein the first sub-battery reversely grows on the substrate and is provided with a first band gap; the second sub-battery is reversely formed on the first sub-battery and is provided with a second band gap smaller than the first band gap; the third sub-battery is reversely formed on the second sub-battery and is provided with a third band gap smaller than the second band gap; the fourth sub-battery is reversely formed on the third sub-battery and is provided with a fourth band gap smaller than the third band gap; the first sub-battery, the second sub-battery, the third sub-battery and the fourth sub-battery are in lattice matching with the substrate; the gradient buffering layer is formed on the fourth sub-battery, is used for overcoming the lattice mismatching between the fourth sub-battery and the fifth sub-battery and is provided with a fifth band gap smaller than the fourth band gap; and the fifth sub-battery is reversely formed on the homogeneous gradient buffering layer and is provided with a sixth band gap smaller than the fifth band gap. Through various later-stage processes, the required solar battery is obtained. The high-efficiency multi-junction solar battery with current matching and wider spectral-absorbing range can be prepared through the invention.

The invention discloses a preparation method of a barium titanate/iron oxyhydroxide photocatalyst. The preparation method comprises the following steps: preparing an H2Ti2O5 precursor with a three-dimensional hierarchical structure by adopting a solvothermal method; by adopting a hydrothermal method and taking an H2Ti2O5 precursor as a template, carrying out topological conversion through ion exchange to prepare BaTiO3 powder; and dissolving FeCl3. 6H2O powder in absolute ethyl alcohol, adding the BaTiO3 powder obtained in the step 2 into the absolute ethyl alcohol, carrying out ultrasonic dispersion to obtain a suspension, adding NH4HCO3 into the suspension, carrying out a stirring reaction, and finally, washing and drying a reaction precipitate to obtain the BaTiO3/FeOOH heterojunction photocatalyst. The preparation method is simple in process, low in reaction temperature, short in reaction time, low in material cost and suitable for industrial production; and the FeOOH/BaTiO3 heterogeneous photocatalyst obtained through the method is more in active sites, higher in sunlight utilization rate and higher in photon-generated carrier separation efficiency and has excellent photo-Fenton catalytic dye degradation performance.

The invention discloses a BaTiO3/BiOIO3 composite material as well as a preparation method and application thereof, belongs to the technical field of photocatalysis, and solves the technical problems that an existing catalytic material is low in solar energy conversion efficiency, only responds to a part of light and the like during photocatalytic reaction. According to the preparation method of the BaTiO3/BiOIO3 composite material disclosed by the invention, BiOIO3 and BaTiO3 with proper energy band structures are selected, a hydrothermal method is adopted, BiOIO3 is introduced to the surface of BaTiO3 powder to prepare and construct the composite material, the hydrothermal reaction condition is mild, the time is short, and the preparation method is suitable for industrial production; the photodegradation efficiency of the obtained BaTiO3/BiOIO3 composite material is far higher than that of pure-phase BaTiO3 and BiOIO3, and the BaTiO3/BiOIO3 composite material is expected to be applied to the fields of sewage treatment and the like.

The preparation method comprises the following steps: firstly, uniformly mixing analytically pure Bi2O3, TiO2, Nb2O5 and Fe2O3 with a certain proportion of salt through ball milling according to a chemical formula Bi3Ti<1-x>FexNbO9; secondly, roasting powder obtained by drying in a muffle furnace to obtain a blocky solid; thirdly, washing the blocky solid; and finally, carrying out drying to obtain the Fe-doped Bi3TiNbO9 nanosheet. The preparation method is simple in preparation process, low in reaction temperature, short in reaction time, low in material cost and suitable for industrial production, and the Bi3Ti<1-x>FexNbO9 photocatalyst obtained through the method is wide in visible light response range, high in photon-generated carrier separation efficiency and excellent in dye photocatalytic degradation performance.

The invention belongs to the technical field of environmental engineering, and provides a preparation method and application of a photocatalytic material for efficiently degrading tetrabromobisphenol A by visible light. C-coated ZnC, Bpn and g-C3N4 are used as precursors, and the g-C3N4/C-coated ZnC/Bpn (CZB) ternary heterojunction photocatalytic material is constructed through a high-temperature calcination method. C-coated ZnC and Bpn are introduced into g-C3N4 containing N defects to construct a ternary heterojunction, so that the spectrum utilization rate and the conductivity can be improved, a band gap structure can be optimized, and relatively strong oxidation-reduction capability is generated. The migration capability of photon-generated carriers on the CZB is also enhanced, so that the recombination rate of the CZB is inhibited, and the photocatalytic degradation performance is improved. Under the visible light condition, the degradation rate of the prepared heterojunction material on TBBPA can reach 96% or above within 50 min. The ternary heterojunction photocatalyst is simple in preparation method, wide in raw material source, low in price and easy for large-scale production.

The invention provides application of SrTiO3/Fe2O3 in hydrogen production through water photolysis. The spectral absorption range is widened greatly by a photocatalysis composite material SrTiO3/Fe2O3, the good ultraviolet/visible absorbing capability is achieved, and therefore the water photolysis hydrogen production efficiency is greatly improved; the water photolysis hydrogen production operation is easy, the cost is low, environmental protection is achieved, the repeatability is good, the efficiency is high, the good hydrogen production rate is achieved in different solutions, the universality and scale production value are obtained, and the wide application prospect is achieved.

The invention provides a flexible antimony selenide/perovskite laminated solar cell. The flexible antimony selenide/perovskite laminated solar cell comprises a substrate, a back electrode, an antimony selenide absorption layer, a buffer layer, a window layer, an intermediate composite layer, a hole transport layer, a perovskite absorption layer, an electron transport layer and a conductive electrode which are arranged in sequence, and the material of the middle composite layer is selected from one or more of molybdenum oxide, indium tin oxide, zinc oxide, aluminum-doped zinc oxide, tin oxide and C60. Compared with the prior art, the multi-junction solar cell is formed by a plurality of light absorbents with different band gaps, so that the utilization range of a solar spectrum can be widened, the thermal relaxation loss of photon-generated carriers can be reduced, and the photoelectric conversion efficiency of the solar cell is further improved.

The invention relates to modified attapulgite loaded with copper and silver ions and a preparation method thereof. The preparation method comprises the following steps that sodium silicate and distilled water are weighed, when uniform turbid liquid is prepared, attapulgite is added, stirring is continuously carried out until a mixture is mixed to be in a semi-dry viscous state, and spherical granular attapulgite carriers are prepared and are dried naturally for later use; titanium dioxide powder is added into the uniform sodium silicate turbid liquid, and stirring is carried out at the same time until titanium dioxide is uniformly mixed; the prepared spherical attapulgite carriers are put into viscous liquid, stirring is carried out until the spherical attapulgite carriers are uniformly loaded with the titanium dioxide, and after being natural dried, the spherical attapulgite carriers loaded with the titanium dioxide are calcined, then are naturally cooled and are washed with water; and copper ion loading and silver ion loading are carried out respectively by using a copper salt solution and a silver salt solution, the pH value of the solution is adjusted to be about 5-7, and thencalcining is carried out at 250 DEG C for 0.5-4 hours in a muffle furnace after loading is finished. According to the modified attapulgite and the preparation method thereof, the purpose of efficiently treating formaldehyde under the accessible conditions can be achieved.