10results about How to "Slow crystallization rate" patented technology

The present application relates to the technical field of polyester material modification, and particularly relates to a high-transparency polyethylene naphthalate material, a preparation method and application, aiming at the problems of fast crystallization rate of the PEN material in the process of processing and molding, easy crystallization of thick products, light transmittance reduction caused by the crystallization, and insufficient material toughness, the present application introduces a diol monomer containing a side group and a flexible chain segment diol monomer into the PEN melt polycondensation process for copolymerization, wherein the diol containing a side group introduces a steric hindrance structure in the molecular chain to destroy the regular packing of the PEN molecular chain, thereby inhibiting the material crystallization behavior and improving the light transmittance of the thick product; the flexible diol introduces a flexible chain segment in the molecular chain to increase the free volume of the molecular chain and improve the molecular chain movement ability, thereby improving the material toughness. Through the above-mentioned synergistic copolymerization modification method, the crystallization tendency of the PEN material can be effectively reduced, the obtained PEN thick product has excellent light transmittance and toughness at the same time, and is suitable for the preparation of high-performance transparent polyester products.

The invention discloses a method for synthesizing a hierarchical pore MFI molecular sieve membrane based on a sacrificial crystal seed layer, and belongs to the field of zeolite molecular sieve membrane synthesis. The hierarchical pore MFI molecular sieve membrane with a compact selective top layer and a macroporous transition layer with high porosity is successfully constructed on a porous carrier through a surface wet gel secondary growth technology of a sacrificial crystal seed layer. The film layer structure and the gas separation performance are optimized by regulating and controlling the composition, the aging time and the crystallization time of the synthetic gel. The prepared hierarchical pore MFI molecular sieve membrane shows high permeability and excellent selectivity in n-butane / iso-butane separation, and the preparation process is good in repeatability, high in stability and suitable for industrial gas separation application.

The application provides a preparation method of a sodium-rich and low-water-content Prussian blue positive electrode material, which comprises the following steps: dissolving sodium ferrocyanide or a hydrate thereof and a complexing agent in deoxygenated water under an inert gas atmosphere and at a certain temperature to obtain a mixed solution A; dissolving a transition metal salt or a hydrate thereof, a sodium supplementing agent, a complexing agent and an auxiliary complexing agent in deoxygenated water under an inert gas atmosphere and at a certain temperature to obtain a mixed solution B; continuously stirring solution A and solution B by dropwise adding them into a container with a positive pressure inert gas atmosphere and at a certain temperature, continuing to stir for a period of time after the dropwise adding is completed, and then standing, centrifuging and vacuum drying to obtain the Prussian blue positive electrode material. The Prussian blue positive electrode material comprises a mixed phase structure of rhombic phases and cubic phases, has the characteristics of high sodium content and low water content. The battery assembled by using the positive electrode material obtained by the method has a theoretical specific capacity close to the theoretical specific capacity under a small current density and still has a high specific capacity under a large current density.

This invention provides a wide-bandgap perovskite thin film, a perovskite tandem solar cell, and a method for preparing the same, relating to the field of photovoltaic technology. The method for preparing the perovskite thin film includes: adding a perovskite structural material and an organic additive to an organic solvent to obtain a perovskite precursor solution; spin-coating the perovskite precursor solution onto a substrate; and annealing the substrate to obtain the perovskite thin film. The organic additive includes a material containing a thiophene dioxide framework. The organic additive used in this invention can effectively regulate the crystallization rate of mixed halides, delay crystallization, enhance the uniform distribution of the mixed halide phase, reduce the defect density in the wide-bandgap perovskite thin film, and significantly improve the power conversion efficiency and stability of the solar cell, thereby obtaining a high-performance tandem solar cell.

This invention belongs to the field of optoelectronic technology, specifically relating to a method for fabricating a controllable crystallization micron-scale perovskite light-emitting device based on solution pretreatment. The method includes the following steps: Step 1: Obtaining a patterned microporous substrate; Step 2: Pre-wetting and seed layer construction; Step 3: Deposition of the main perovskite layer; Step 4: Slow-release controllable crystallization; The spin-coated wet film is placed in a vapor atmosphere of a good solvent for treatment, followed by thermal annealing to form a perovskite thin film within the patterned micropores; Step 5: Fabrication of a controllable crystallization micron-scale perovskite light-emitting device based on solution pretreatment. This invention, using pre-wetting, seed guidance, slow-release crystallization, and vapor annealing on a patterned microporous substrate, achieves precise control over the entire process of film nucleation and growth kinetics within the confined space of the micropores, thereby achieving high-quality, uniform fabrication of perovskite thin films within micron-scale micropores, and ultimately obtaining a high-performance, highly uniform microarray perovskite light-emitting device.

The application discloses a sodium ion battery positive electrode material and a preparation method thereof. By adding cheap, non-toxic, environment-friendly and easily-degradable water-soluble cellulose as an additive, the growth of a specific crystal direction can be inhibited. The hydrophilic group of the water-soluble cellulose can change the coordination environment of metal ions and reduce the entry of water molecules into the crystal lattice. In addition, by introducing the water-soluble cellulose, high-concentration reactant feeding can be realized, which is beneficial to reducing the consumption of industrial water. Meanwhile, compared with other existing additives, the water-soluble cellulose is environment-friendly, easily-degradable, low in production and separation cost, and free of toxic by-product generation. The prepared open three-face cubic Fe-based Prussian blue analogue material is good in dispersity, high in purity and uniform in morphology, and as a sodium ion battery positive electrode material, has a reversible capacity of 155.40 mAhg ‑1 at 0.1C (1C=170 mAhg ‑1 ) and a first discharge coulombic efficiency of 97.83%.

This invention discloses a method for preparing a multifunctional molecularly regulated wide-bandgap perovskite solar cell. This method introduces the inexpensive multifunctional molecule L-glutamate hydrochloride (GluHCl) into the wide-bandgap perovskite bulk phase. Utilizing the chemical coordination between GluHCl and PbI2, the crystallization process of the perovskite is effectively regulated, thereby improving the crystallinity quality of the perovskite thin film. Furthermore, GluHCl, on the one hand, through its –NH3... + Terminal passivation of negatively charged deep-level defects (such as I-Pb inversion defects) reduces voltage drop; on the other hand, through –COO ‑ The group coordinates with halogen vacancy defects, suppressing photoinduced phase separation. Based on these advantages, wide-bandgap perovskite solar cells with bandgap values ​​of 1.66 eV, 1.78 eV, and 1.83 eV were fabricated using GluHCl, achieving power conversion efficiencies of 23.36%, 19.46%, and 18.69%, respectively. This method exhibits good process repeatability and bandgap universality, providing a simple and effective strategy for the fabrication of efficient and stable wide-bandgap perovskite solar cells.

Provided is a copolyester containing: a diacid / diester component having from 70 mol% to 99 mol% of terephthalic acid units and from 1 mol% to 30 mol% of non-terephthalic acid-based diacid / diester units, based on the total diacid / diester component; and a diol component having from 1 mol% to 15 mol% of a cyclohexylidene group-containing diol and from 82 mol% to 99 mol% of ethylene glycol, and from 0 mol% to 3 mol% of diethylene glycol (DEG), based on the total diol component; articles made from the copolyesters and methods of making the copolyesters.

This invention discloses an all-inorganic silicon-based perovskite tandem solar cell and its fabrication method. The fabrication method includes: providing a heterojunction crystalline silicon substrate with a micro-pyramid structure for the light-absorbing surface; fabricating a hole transport layer on the light-absorbing surface of the heterojunction crystalline silicon substrate; coating the hole transport layer with a perovskite precursor solution, wherein the solute in the perovskite precursor solution includes an inorganic salt and an organic ammonium salt, which is used to form an all-inorganic perovskite light-absorbing layer by annealing; the solvent includes a main solvent and a coordination solvent; and sequentially fabricating an electron transport layer and an electrode on the all-inorganic perovskite light-absorbing layer. This invention, through a one-step solution method, introduces organic ammonium salts and coordination solvents into the all-inorganic perovskite precursor solution, significantly delaying the crystallization kinetics of CsPbI3. The resulting film has a uniform and dense morphology, achieving complete coverage of the rough textured heterojunction substrate, thereby fabricating a high-efficiency all-inorganic silicon-based perovskite tandem solar cell.

The application discloses a kind of wide band gap perovskite light-absorbing layer containing pyridinium iodide, solar cell and preparation method thereof, the light-absorbing layer is by doping 0.1-5 mg / ml concentration trans-4-{4-(dimethylamino) styryl}-1-methylpyridinium iodide in perovskite precursor solution, and then the perovskite light-absorbing layer containing pyridinium iodide is prepared.The preparation method of the application is by introducing trans-4-{4-(dimethylamino) styryl}-1-methylpyridinium iodide additive in perovskite light-absorbing layer bulk phase, slows down the difference problem of bromide and iodide crystallization rate in perovskite film forming process, promotes the uniform distribution of each element, and effectively inhibits the phase separation phenomenon of iodine ion and bromine ion, so as to improve the quality of perovskite film, so that perovskite film has good thermal stability, after heating at 85 DEG C for 1000 hours, the efficiency still remains 90% of initial value.