Abstract: A method for improving the stability of perovskite solar cells includes: adding iodoformamidine and cesium iodide to a solvent and stirring, adding bromomethylamine and stirring, adding lead iodide and 3,4-dichloroaniline and stirring, obtaining a perovskite precursor solution for improving the stability of perovskite solar cells, spin-coating the perovskite precursor solution for improving the stability of perovskite solar cells onto a substrate, and performing thermal annealing to obtain a light absorption layer of a solar cell. A solar cell prepared with said perovskite layer solves the defects of existing perovskite technology, providing a means for improving the stability of perovskite for use in the preparation of batteries that has low processing environment requirements and a convenient preparation method, and can maintain stable properties in an ordinary environment for a long time.

Abstract: Disclosed is a perovskite precursor solution for improving stability of a perovskite solar cell. Iodoformamidine and cesium iodide are added into a solvent, and bromomethylamine, lead iodide and 3,4-dichloroaniline are added after stirring to obtain the perovskite precursor solution. The perovskite precursor solution is spin-coated on a substrate, obtaining a perovskite thin film by thermal annealing as a light absorption layer of the solar cell. The perovskite precursor solution prepared by the present invention replaces an existing perovskite layer, the defects in the existing perovskite mineralization technology are solved. The perovskite stability improvement leads lower requirements for the process environment and convenient preparation method, realizes the long-time stable performance in a common environment.

Abstract: A method of creating holographic image on printed surface including the following steps: A. selecting a basis material; B. printing conventional printing pattern layer upon thed basis material layer; C. coating a transparent medium of holographic coating layer used to create holographic pattern upon the surface of printed pattern layer, wherein the medium is transparent thermoplastic material containing solvent type copolymerised resin; the holographic coating layer is produced by the holographic coated medium heated and dried by the infrared; and D. embossing the material with holographic coating layer by heating installing dolographic form on the outer surface of the form roller of the embossing machine; when the material with holographic coating layer is conveyed to the embossing machine, the holographic coating layer is embossed and the holographic image is produced under the pressure of the holographic form while the holographic coating layer is softened by heat.