9results about How to "Reduced nucleation rate" patented technology

The invention relates to a perovskite thin film, a passivation method and application, belongs to the technical field of photoelectric functional materials and devices, and aims to solve the problems of low efficiency, poor stability and the like of a solar cell caused by perovskite crystal defects in the prior art. The perovskite thin film passivation method comprises the following steps: adding 1, 4-butane sultone into a perovskite precursor solution to obtain a mixed solution, processing the mixed solution to form a perovskite precursor thin film, and carrying out annealing treatment to obtain the perovskite thin film. By adding BuSO, the nucleation rate of perovskite can be effectively reduced, so that the large-grain and high-quality perovskite thin film is obtained, the BuSO can be subjected to halogen ion induced ring-opening reaction in the annealing process, generated chain ions are distributed on the grain boundary and the surface and act with perovskite, compounding of a bulk phase and an interface is reduced, and the performance of the perovskite thin film is improved. And the efficiency and the long-term stability of the solar cell are effectively improved.

The application provides a lithium-rich manganese-based material and a preparation method and application thereof. The chemical general formula of the lithium-rich manganese-based material is Li 1.2+x (Mn a Co b Ni c ) 0.8‑x O2, wherein, -0.2

The application discloses high-quality bismuth-based perovskite monocrystals and a preparation method and application thereof. The preparation method of the high-quality bismuth-based perovskite monocrystals comprises the following steps: S1, preparing a single crystal growth precursor solution of the bismuth-based perovskite; S2, performing heat aging treatment on the prepared single crystal growth precursor solution; and S3, controlling the single crystal growth precursor solution after the heat aging treatment to crystallize and grow the bismuth-based perovskite monocrystals. The heat aging process of the precursor solution can obviously reduce the nucleation rate, effectively improve the crystallization quality, and finally obtain large-size high-quality bismuth-based perovskite monocrystals. The method has the advantages of simple process, strong operability, mild growth conditions, low required temperature, energy saving, low equipment requirement, low cost, high success rate, no need of additional seed crystals, and continuous growth of large-size high-quality perovskite monocrystals.

The invention discloses a gas-liquid reaction coprecipitation preparation method of a Prussian white positive electrode material, and belongs to the technical field of sodium ion batteries. The preparation method comprises the following steps: dissolving soluble bivalent transition metal salt and organic acid sodium salt in deionized water to prepare a solution A; introducing hydrogen cyanide gas into the solution A, and carrying out a co-precipitation reaction at a certain temperature for a certain time to prepare a solid precipitate; and finally, centrifuging, washing and drying the prepared solid precipitate to obtain the Prussian white positive electrode material. The preparation process is simple, and the production cost is reduced; the crystallization rate of the Prussian white positive electrode material is slowed down, and the prepared positive electrode material has high crystallinity, large-particle morphology and excellent structural stability.

The invention discloses an aluminum alloy bar as well as a low-temperature extrusion preparation method and application thereof, and belongs to the technical field of aluminum alloy materials. The aluminum alloy bar comprises the following components in percentage by weight: less than or equal to 0.1% of Si, 1.3%-1.4% of Fe, 2.6%-2.8% of Cu, 1.7%-1.8% of Mg, 1.4%-1.6% of Ni, less than or equal to 0.25% of Zn, 0.05% of Ti and the balance of Al. The single impurity is less than or equal to 0.05%, the total impurity is less than or equal to 0.15%, and the balance is Al. The tensile strength of the aluminum alloy bar is larger than or equal to 415 MPa, the yield strength is larger than or equal to 305 MPa, the ductility is larger than or equal to 11.0%, and grains are fine and evenly distributed.

The invention relates to the technical field of nickel-based powder, in particular to a preparation method and a preparation device of nano nickel-based powder, and the preparation method comprises the following steps: A, uniformly mixing nickel salt, a reducing agent, an additive and a solvent, and adjusting the pH value to 8-12 to obtain a precursor solution; b, the precursor solution is subjected to a reaction for 10-60 s and 10-60 min in a nucleation temperature section and a growth temperature section in sequence respectively, and then is frozen for 5-20 min in a freezing temperature section, and a nano nickel-based particle mixture is obtained; wherein the temperature of the nucleation temperature section is higher than that of the growth temperature section, and the temperature of the growth temperature section is higher than that of the freezing temperature section; and C, sequentially separating, washing and drying the nano nickel-based particle mixture to obtain the nano nickel-based powder. According to the preparation method of the nano nickel-based powder and the preparation device of the nano nickel-based powder, on the premise that the production cost is reduced, it is guaranteed that the size uniformity, dispersity and morphology of the nano nickel-based powder are controllable.

The invention discloses a Prussian blue analogue and a preparation method and application thereof. The preparation method of the Prussian blue analogue comprises the following steps: mixing raw materials for forming a low eutectic solvent, heating to a target temperature, and obtaining a high-viscosity liquid low eutectic solvent; mixing the high-viscosity liquid low eutectic solvent with sodium ferrocyanide and an optional metal salt at the target temperature, and obtaining high-quality Na x M[Fe(CN)6] y □ 1‑y ·zH2O. The present invention utilizes an anhydrous low eutectic solvent to synthesize a Prussian blue analogue, which reduces the crystal water content in the product on the one hand, and utilizes the high viscosity of the low eutectic solvent to reduce the nucleation rate of the product on the other hand, thereby synthesizing low-defect and nano-sized particles.

This invention relates to a method for obtaining high-density nanoscale lines, belonging to the field of semiconductor technology. It solves the problem of high manufacturing costs associated with the use of expensive extreme ultraviolet (EUV) lithography machines to reduce the width of the sacrificial layer in existing technologies. The method includes the following steps: sequentially forming a dielectric layer and an amorphous silicon layer on a substrate; irradiating a mask with a laser to crystallize silicon in a portion of the amorphous silicon layer, wherein the grain boundaries of the polycrystalline silicon formed after silicon crystallization in the amorphous silicon layer are determined by the spacing of regularly shaped apertures on the mask; planarizing the grain boundaries of the polycrystalline silicon in the amorphous silicon layer; removing the grain boundaries using an etchant to form grain boundary trenches; and forming a sacrificial layer using the grain boundary trenches, and obtaining nanoscale lines on the substrate using a sidewall transfer method.

The present invention relates to cement and its manufacturing field, specifically discloses a low-heat high-grade cement and a preparation method thereof, wherein the low-heat high-grade cement is obtained by mixing low-heat high-grade cement clinker with gypsum, admixture, and granulated blast furnace slag; the raw material ratio of low-heat high-grade cement clinker is by weight percentage: 75-86wt% of lime, 3-6wt% of tailings waste, 10-16wt% of clastic rock, and 1-3wt% of yellow phosphorus slag; the admixture is a mixture of polyacrylic acid and polytetrafluoroethylene. By adding polytetrafluoroethylene to polyacrylic acid, the hydration heat inhibition effect of polyacrylic acid is significantly improved, and yellow phosphorus slag and granulated blast furnace slag are added at the same time, the early strength of cement is also improved, and the synergistic effect of early strength and low hydration heat of low-heat high-grade cement is achieved.