Perovskite thin film and preparation method and application thereof

By using fluorinated phosphazene compounds as ligands in perovskite thin films, the cation distribution and stress relief were controlled, thus solving the stability and crystallinity problems of perovskite thin films under environmental stress and achieving efficient carrier transport and improved device performance.

CN121510844BActive Publication Date: 2026-07-24JIANGXI UNIV OF SCI & TECH
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
JIANGXI UNIV OF SCI & TECH
Filing Date
2025-11-18
Publication Date
2026-07-24

AI Technical Summary

Technical Problem

Existing perovskite films exhibit poor stability under environmental stresses such as humidity, heat, and light. Uneven cation distribution affects crystallinity and long-term stability, and existing improvement schemes cannot effectively eliminate residual stress and improve uniformity.

Method used

Fluorophosphazene compounds were used as ligands and mixed with perovskite precursor solutions. Through hydrogen bonding and coordination bonding, some formamidinium cations were anchored at the bottom of the film, eliminating residual stress and forming coordination bonds with Pb2+ to passivate defects and regulate crystallization kinetics.

Benefits of technology

This method achieves uniform cation distribution in perovskite films, eliminates residual stress, improves film stability and crystallinity, maintains the original band gap, and enhances carrier transport efficiency and device performance.

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Abstract

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.
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Citation Information

Patent Citations

  • CN119855352A

  • CN120225018A