7 results about "Lead iodide" patented technology

This invention relates to a perovskite solar cell doped with a disulfonic acid-based functionalized ionic liquid and its preparation method. By doping a perovskite precursor solution with a disulfonic acid-based functionalized ionic liquid, this invention effectively controls the crystallization process of perovskite, reduces lead iodide residue, and prepares a perovskite film with better crystallinity, larger and more uniform grain size, and a smoother surface, thereby improving the stability of the perovskite film. Furthermore, the presence of disulfonic acid groups in the ionic liquid anchors uncoordinated Pb ions, inhibits ion migration, and passivates defect states in the perovskite material, significantly improving the quality of the perovskite film and thus enhancing the photoelectric conversion efficiency and long-term stability of the solar cell. Simultaneously, after perovskite film formation, the ionic liquid is mainly distributed at the upper and lower interfaces, achieving synergistic passivation of the two interfaces of the perovskite film, further improving the photoelectric conversion efficiency and long-term stability of the solar cell.

The application provides a preparation method of a perovskite film, the perovskite film and a solar cell, and the method comprises the following steps: providing an inorganic skeleton layer, the material of the inorganic skeleton layer comprising lead iodide; coating a guiding agent solution on the surface of the inorganic skeleton layer, and performing annealing treatment on the inorganic skeleton layer coated with the guiding agent solution to obtain a guiding film, the guiding agent solution comprising a main solvent and a functional additive, the main solvent comprising an alcohol solvent, and the functional additive comprising an organic solvent having a dissolving capacity for the film; and printing an organic cation solution on the inorganic skeleton layer after the annealing treatment to obtain the perovskite film. The application solves the problems of poor longitudinal uniformity, lead iodide residue at a buried bottom interface and insufficient reaction in the preparation of the perovskite film in the prior art, and the problems of the perovskite film being difficult to simultaneously realize high open-circuit voltage and high fill factor.

The application relates to a tin-doped two-dimensional organic-inorganic hybrid perovskite material, a preparation method thereof and application of the material in photocatalytic hydrogen production, and belongs to the technical field of energy catalysis. The chemical formula of the material is Sn 0.05 (C5H 10 F2N)2PbI4, and the material is obtained by doping Sn 2+ ions into a (4,4-difluoropiperidinium)2PbI4 perovskite crystal lattice. The material is prepared by using 4,4-difluoropiperidine, lead iodide and stannous iodide as raw materials in a hydriodic acid system, and through heating dissolution and cooling crystallization under the reduction protection of hypophosphorous acid. The introduction of Sn 2+ optimizes the energy band structure of the material, enhances visible light absorption, and further induces a local polarization field, effectively promotes the separation and migration of photo-generated carriers, and thus realizes high-efficiency and stable photocatalytic hydrogen production performance. Through external ultrasonic, the interface charge separation efficiency and surface reaction kinetics are further improved, and the hydrogen production rate is significantly enhanced. The material has the advantages of mild preparation conditions, strong structure adjustability, high catalytic efficiency and good stability, and provides an effective way for developing a novel high-efficiency photocatalytic hydrogen production system.

In this work, a new method for synthesizing lead iodide (PbI₂) thin films was developed using the chemical bath deposition (CBD) method, which consisted of two stages. In the first stage, tin oxide films were synthesized to act as a seed layer, allowing for better adhesion of the film to be deposited. The second stage consisted of synthesizing the lead iodide films. Finally, heat treatments (100, 150°C, 200°C, 250°C, 270°C) were performed to promote polytype transitions in the material and to study the effect of these structures on the optical, chemical, and structural properties of the material. The direct influence of the heat treatment on the induction of polytypes was determined, and these polytypes clearly influence the structure and chemical composition of the resulting films.The results showed that the formulation sequence is crucial for generating a heterogeneous mechanism, which leads to the formation of lead iodide films. The samples obtained exhibited a characteristic yellow color of lead iodide films. Structural and compositional characterization using X-ray diffraction and transmission electron microscopy established that the films, both with and without heat treatment, exhibit a 2H and 4H polytypical structure. Furthermore, an increase in the contribution of the 4H structure and crystallinity was observed with increasing heat treatment temperature, a result consistent with the hypothesis and objectives of the project.Using Raman microscopy, we were able to identify the vibrational modes of the films with and without heat treatment, which correspond to the vibrational modes of 2H and 4H polytypical structures. Finally, their optical properties were measured using UV-Vis optical microscopy, establishing that temperature does not have a significant effect on the onset of fundamental absorption of the material. Applying the Kubelka-Munk method, we were able to determine the band gap for the lead iodide films, Eg 2.4 eV.

This invention relates to an inorganic perovskite thin film, its preparation method, and a solar cell. The method includes the following steps: S1: forming a first thin film through a first vapor deposition process; S2: annealing the first thin film to obtain a second thin film; S3: forming a third thin film on the second thin film through a second vapor deposition process; and S4: annealing the second thin film and the third thin film to obtain the inorganic perovskite thin film; wherein, in the first vapor deposition process, the raw materials used for evaporation include cesium bromide and lead iodide; and in the second vapor deposition process, the raw materials used for evaporation include cesium iodide and lead iodide. The inorganic perovskite thin film prepared by the method of one embodiment of this invention, compared with existing inorganic perovskite thin films, improves the phase stability of the perovskite structure without affecting the light absorption range of the prepared solar cell, and simultaneously improves the photoelectric conversion efficiency of the cell.

The application belongs to the technical field of photoelectric materials and devices, and particularly relates to a perovskite film and a preparation method and application thereof. A fluorine-containing phosphazene compound is used as a ligand, mixed with a perovskite precursor solution composed of lead iodide, formamidinium iodide and cesium iodide, and then spin-coated. The fluorine-containing phosphazene compound forms a hydrogen bond with part of the formamidinium cations, anchors the part of the formamidinium cations at the bottom of the perovskite film, and makes the Cs-formamidinium cations uniformly distributed. Meanwhile, the fluorine-containing phosphazene compound forms a coordination bond with Pb 2+ , passivates Pb 2+ defects, and the perovskite film is obtained through an anti-solvent treatment and an annealing treatment. The fluorine-containing phosphazene compound interacts with components in the perovskite precursor solution, can increase a nucleation rate of the perovskite, slow down a crystallization rate, eliminate a tensile stress, and not enter a crystal lattice, thereby guaranteeing stability and crystallinity of the film. The perovskite film can be used for an inverted perovskite solar cell, and can improve device performance and stability.

This invention discloses an ordered perovskite nanosheet thin film, its preparation method, and a solar cell device. The method includes: first, adding cesium carbonate and oleic acid to a three-necked flask, evacuating the gas, and heating to obtain a cesium oleate precursor solution; then, purging with nitrogen and maintaining the temperature; next, adding lead iodide and octadecene sequentially to the three-necked flask, evacuating the gas, heating, purging with nitrogen, injecting oleic acid and oleylamine, reacting to form a lead iodide precursor solution, injecting it into the lead iodide precursor solution, reacting, quenching, and obtaining a crude perovskite nanosheet solution; purifying and dispersing the crude solution in a nonpolar solvent to obtain a perovskite nanosheet dispersion; dropping the dispersion onto the surface of deionized water, where it self-assembles into a thin film at the gas-liquid interface; then, immersing a substrate perpendicular to the liquid surface into deionized water and pulling it up to transfer the film to the substrate surface, obtaining an ordered perovskite nanosheet thin film. This invention effectively reduces carrier transport resistance and nonradiative recombination, improving the photoelectric performance of the perovskite nanosheet thin film.