58results about How to "Improve charge transport efficiency" patented technology

The invention provides a quantum dot printing ink and a preparation method thereof, and a quantum dot light emitting diode, belonging to the technical field of quantum dot luminescence. The quantum dot printing ink comprises, on the basis that the weight percentage content of the quantum dot printing ink is 100%, 0.1 to 20.0% of quantum dot, 0.1 to 15.0% of a charge transferring agent, 40.0 to 90.0% of a solvent, 0.1 to 15.0% of a viscosity conditioning agent and 0 to 15% of a dispersing agent, wherein the solvent comprises a main solvent and a cosolvent. The quantum dot printing ink provided by the invention contains the charge transferring agent capable of facilitating charge transfer, so charge transfer of a quantum dot luminescent layer prepared from the quantum dot printing ink is more effective; thus, threshold voltage is reduced, and energy efficiency is improved.

The invention relates to the technical field of quantum dot light emitting, and provides quantum dot printing ink and a preparation method thereof and a quantum dot light-emitting diode. The quantum dot printing ink is prepared from, by weight, 0.1%-20.0% of quantum dots, 0.1%-15.0% of charge transfer agents, 40.0%-90.0% of solvent, 0.1%-15.0% of viscosity modifier and 0-15.0% of dispersing agent, wherein the charge transfer agents comprise a positive charge transfer agent and a negative charge transfer agent, and the solvent comprises main solvent and cosolvent.

The invention relates to a stable perovskite film and a preparation method thereof and an application of the perovskite film in photoelectric devices. According to the perovskite film, an anti-solventcontaining small organic molecules of a conjugated pi system is dropwise added in a one-step spin-coating preparation process, and a mixed layer of the small organic molecules and perovskite is formed after annealing. Through supermolecular cation-pi interaction between the small organic molecules of the conjugated pi system and cations in the perovskite, the defect of the perovskite film can begreatly reduced and the stability is significantly improved. Furthermore, the invention further provides the corresponding photoelectric devices, such as a perovskite cell, a light-emitting diode anda photoelectric detector, prepared by using the preparation method of the perovskite film. Compared with a standard device to which the small organic molecules of the conjugated pi system are not added, the obtained photoelectric devices have the advantages that the performance and the stability are improved.

The present invention discloses an organic solar cell by employing PED0T:PSS doped with MXene as the material of an anode modification layer and a preparation method thereof. The organic solar cell device comprises an anode substrate, an anode modification layer, an active layer, a cathode modification layer and a cathode layer which are stacked in order. The material of the anode modification layer is made of the PED0T:PSS doped with MXene, and the doping mass percent of the MXene is 2-6.5%. The organic solar cell device is prepared by employing the PED0T:PSS doped with the MXene with high conductivity and high light transmission and having a work function matched with the work function of an ITO as the anode modification layer, firstly, the MXene has high conductivity to effectively improve the charge transmission efficiency of the organic solar cell, secondarily, the MXene can effectively regulate and control the power function of the anode to reduce the interface ability between the anode and the active layer, and finally, the photoelectric conversion efficiency of the organic solar cell is improved.

The invention discloses a film, a preparation method thereof and a QLED device. The method includes the following steps: providing a nanometer metal oxide solution; adding an organic heterocyclic compound to the nanometer metal oxide solution to obtain a modified nanometer metal oxide solution; and preparing the modified nanometer metal oxide solution into a film to obtain a modified nanometer metal oxide film. According to the invention, a nanometer metal oxide is modified so as to increase the electron transmission efficiency of the nanometer metal oxide and increase conductive sites on thesurface of the nanometer metal oxide, thereby improving the overall charge transmission efficiency of the QLED device, optimizing the matching of a quantum dot luminescent layer and an electron transmission layer and the like to improve the luminous efficiency of the overall device.

The invention discloses a covalent triazine organic framework composite photocatalyst with surface confinement monodisperse Pt nanoparticles as well as a preparation method and application of the covalent triazine organic framework composite photocatalyst, and belongs to the technical field of material preparation and photocatalysis. According to the preparation method, a covalent triazine organicframework is used as a carrier, residual cyano groups in the covalent triazine organic framework are converted into scaffold carboxyl through alkaline hydrolysis, Pt nanoparticles are anchored to thescaffold carboxyl through a photodeposition method, and the covalent triazine organic framework composite photocatalyst Pt-CTF-COOH with the surface confinement monodisperse Pt nanoparticles is prepared. According to the method, carboxyl functionalization is carried out on a covalent triazine organic framework, Pt is immobilized on a carboxyl support, monodispersion of Pt nanoparticles is achieved, and the efficiency of photocatalytic decomposition of water into hydrogen is effectively improved. The photocatalyst is good in stability and long in service life, the synthesis method is simple and convenient, the problems that in the prior art, a photocatalyst preparation process is tedious, poor in stability and the like are solved, the actual production requirement is met, and great application potential is achieved.

The invention discloses an organic solar cell with MXene as an anode modification layer material and a manufacturing method thereof. An organic solar cell device includes an anode substrate, an anodemodification layer, an active layer, a cathode modification layer, and a cathode layer. The MXene with high conductivity, high transmission of light, and a work function matching with ITO is taken asthe anode modification layer material to manufacture the organic solar cell device. Firstly, the MXene has the high conductivity so that the charge transfer efficiency of the organic solar cell can beeffectively increased; secondly, the MXene can effectively adjust and control the work function, and reduce an interfacial ability between an anode and an active layer; and finally, compared with a corresponding PEDOT: PSS device, by using the cell and the method, higher photoelectric conversion efficiency is achieved.

The invention discloses an organic solar cell made of an organic-inorganic cathode modification layer material and a preparation method thereof. The organic solar cell comprises a cathode substrate, acathode modification layer, a photosensitive active layer, an anode modification layer and an anode, the material of the cathode modification layer is formed by doping dopamine modified Ti3C2Tx and ZnO, and the doping mass percent of the dopamine modified Ti3C2Tx is 2-8%. The cathode modification layer prepared by the method belongs to an organic-inorganic hybrid structure and has excellent electron transport capacity, and the dopamine can achieve multifunctional modification under mild conditions and coats the surfaces of various organic materials and inorganic materials, so that ZnO interface morphology and crystallinity are effectively improved, the electron transport is enhanced, and recombination is reduced; and compared to the solar cell undoped with Ti3C2Tx-PDA, the organic-inorganic composite structure synergistically improves the photoelectric conversion efficiency of the organic solar cell, and the photoelectric conversion efficiency can be improved by 22.74% at most.

A photoelectric conversion element according to an embodiment of the present disclosure includes a first electrode and a second electrode opposed to each other; and a photoelectric conversion layer provided between the first electrode and the second electrode, and including a first organic semiconductor material and a second semiconductor material that have mutually different mother skeletons, in which the first organic semiconductor material is fullerene or a fullerene derivative, and the second organic semiconductor material has a deeper HOMO level than the first organic semiconductor material.

The invention relates to a composite semiconductor nano material which is prepared by calcining nano titanium dioxide (TiO2) and cobalt phthalocyanine (CoPc) as the raw materials at a temperature of below 500 DEG C. By means of an ultraviolet-visible absorption spectrum, a fluorescence spectrum, thermogravimetric analysis and the like, the CoPc / TiO2 composite semiconductor nano material is characterized, and the photoelectrochemical properties, i.e. an open circuit potential-time (Eoc-t) and a relation (I-t) that a current changes with time, of the composite semiconductor nano material are measured. A result shows that under the condition of visible light induction, when an electrondonating substance, i.e. hydroquinone (HQ), is added, electron transfer can occur and a photocurrent can be generated after a circuit is switched on.

The present disclosure provides CMOS image sensors and fabrication methods thereof. An exemplary fabrication process of a CMOS image sensor includes providing a substrate having a first region and a second region connecting with the first region at a first end of the first region: forming a transfer transistor on surface of the substrate in the second region; forming a first implanting region in the substrate in the first region using a first mask; forming a second implanting region in the first implanting region by, the first implanting region being separated into a third implanting region on the second implanting region and a fourth implanting region under the second implanting region; forming a fifth region in the second region at the first end using a second mask, connecting the third implanting region with the fourth implanting region.

The invention relates to a preparation method of a flame-retardant artificial stone containing nano perovskite oxide MTiO3. The nano perovskite oxide and a metal organic framework ZIF material are jointly added into a ternary polyene ester material (such as talcum powder, quartz and phenolic resin), therefore, the heat resistance and the strength of the artificial stone are improved, the aging time of the artificial stone is shortened, the artificial stone can not be degraded for a long time under the high temperature action, the good flame-retardant effect can be kept, and the loss-on-ignition (LOI) index is significantly increased.

The invention discloses a preparation method and application of a bifunctional electrocatalyst, and belongs to the technical field of electrocatalytic materials. According to the technical scheme, the preparation method is characterized in that an MOF precursor is introduced into a high-conductivity one-dimensional carrier shell layer in situ and then is stably compounded with a metal current collector, then electrochemical in-situ activation is carried out, and finally the OER / HER bifunctional electrocatalyst is prepared. The nano bifunctional electrocatalyst prepared by the invention has a multi-stage assembly structure and a multi-dimensional material composite structure characteristic, is beneficial to improving the electrocatalytic activity of the bifunctional electrocatalyst OER / HER and prolonging the service life of the bifunctional electrocatalyst OER / HER, and has a relatively good application prospect in catalysis of water splitting.

The invention discloses a polyamic acid with a general structural formula (I) and a polyimide with a general structural formula (II), wherein a chemical formula shown in the description is the core ofaromatic tetracarboxylic dianhydride; and the weight-average molecular weights of both the polyamic acid and the polyimide are 20000 to 30000. The polyimide has good high-temperature-resistant thermostability, good flexibility, relatively high hydrophobicity and a low dielectric constant. The invention further discloses preparation methods and application of the polyamic acid and the polyimide. (The general structural formula (I) and the general structural formula (II) are shown in the description).

The invention relates to a preparation method of a nanocomposite-modified flame-retardant and corrosion-resisting coating. Nano perovskite oxide and metal-organic framework ZIF materials are jointly added to phyllosilicate, the heat resistance and the corrosion resistance of the coating are remarkably improved, the ageing time of the coating is shortened, and the coating can be non-degradable at the high temperature for a long time and further can keep a better flame retardant effect.

The invention belongs to the field of nitrogen-fixing photocatalyst preparation, and particularly relates to a nitrogen-doped attapulgite / carbon / bismuth oxybromide composite nitrogen-fixing photocatalyst and a preparation method and application thereof. The preparation method includes the steps: dispersing attapulgite and aniline in an aqueous solution, and carrying out in-situ polymerization to obtain an attapulgite / polyaniline composite material; calcining and carbonizing to obtain a nitrogen-doped attapulgite / carbon precursor material, then adding the nitrogen-doped attapulgite / carbon precursor material into a potassium bromide solution, and carrying out uniform ultrasonic dispersion to obtain a dispersion liquid; and dropwise adding the dispersion liquid into a bismuth nitrate glycerolsolution, and continuously stirring to obtain the nitrogen-doped attapulgite / carbon / bismuth oxybromide composite material. Nitrogen-doped attapulgite / carbon and bismuth oxybromide semiconductors areused for constructing a heterojunction material, so that the recombination of photo-induced electrons and holes can be effectively reduced, the visible light absorption efficiency of the material is effectively improved, photocatalytic active sites are provided, and the material has a remarkable application effect in the aspect of nitrogen fixation.

The invention relates to a preparation method of a flame-retardant artificial stone containing nano perovskite oxide. The nano perovskite oxide and a metal organic framework UIO material are jointly added into a ternary polyene ester material (such as talcum powder, quartz and phenolic resin), therefore, the heat resistance and the strength of the artificial stone are improved, the aging time of the artificial stone is shortened, the artificial stone can not be degraded for a long time under the high temperature action, the good flame-retardant effect can be kept, and the loss-on-ignition (LOI) index is significantly increased.

The preparation method comprises the following steps: by taking polyhedral oligomeric silsesquioxane which takes a silicon element as a framework as a precursor, establishing a magnesiothermic reduction reaction process based on a molten salt system, and realizing in-situ conversion of organosiloxane, so as to obtain the nanosheet-shaped silicon-carbon composite material used as the negative electrode material of the lithium ion battery. And thus, the nanosheet-shaped silicon-carbon composite material is obtained. The composite material has excellent cycling stability and lithium storage capacity, the preparation process is simple, the condition is controllable, and the cost is relatively low.