Perovskite Precursor Ionic Compound for Defect and Moisture Control
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Solution Overview
Problem
Perovskite solar cells face efficiency and stability issues due to crystal defects in the light-absorbing layer, which are caused by errors in the arrangement of structural units during film formation, leading to reduced exciton generation, charge carrier diffusion, and charge transport.
Innovation Solution
An ionic compound with a specific ring structure and fluorine-containing anion is used to form a perovskite precursor solution, which reduces non-radiative recombination, prevents water entry, and enhances the hydrophobicity of the perovskite material, thereby improving the stability and efficiency of the solar cells.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the perovskite light-absorbing layer is formed through the solution method, then the preparation process is simple and fast, but crystal defects occur due to errors in arrangement of structural units, reducing efficiency and stability
Solution Approach 1:
The patent introduces an ionic liquid as an intermediary additive in the perovskite precursor solution. This ionic liquid mediates the crystallization process by coordinating with lead ions during film formation, guiding the arrangement of structural units and reducing crystal defects while maintaining the simplicity of the solution method
Solution Approach 2:
The patent modifies the composition parameters of the precursor solution by adding ionic liquid at specific concentrations (0.1-10% by volume). This parameter change alters the crystallization kinetics and thermodynamics, enabling better structural unit arrangement without complicating the overall preparation process
2Use of energy by moving object
If perovskite materials are used to prepare the light-absorbing layer, then visible light absorption efficiency is high, but the materials are sensitive to water and decompose, reducing stability
Solution Approach 1:
The ionic liquid acts as a protective intermediary between the perovskite material and the environment. It forms a hydrophobic interface layer that mediates water interaction, preventing water molecules from reaching and decomposing the perovskite while maintaining the material's optical properties
Solution Approach 2:
The ionic liquid creates a chemically inert microenvironment around the perovskite crystals. Its hydrophobic character and chemical stability establish a protective atmosphere that excludes water and oxygen, preventing decomposition reactions while allowing the perovskite to maintain high light absorption efficiency
3Object-generated harmful factors
If free H and free iodine ions are present in the perovskite material, then they can form acidoids such as hydroiodic acid, but this reduces material stability
Solution Approach 1:
The patent converts the potentially harmful free H and free iodine ions into beneficial coordinated species. The ionic liquid's anions coordinate with lead ions, while the cations interact with free H, preventing acidoid formation and actually improving material stability through these controlled interactions
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The ionic compound improves the stability of perovskite materials, reducing defects and enhancing the efficiency and stability of solar cells by coordinating with lead ions and preventing decomposition through its hydrophobic properties.
Implementation Method 1
The lone pair electrons of the N atom can be coordinated with vacancy-containing lead ions in a perovskite material, thereby reducing non-radiative recombination
Implementation Method 2
The linear alkane can be bonded to free H formed in the perovskite material, avoiding the formation of acidoids such as hydroiodic acid by free H and free iodine ions
Implementation Method 3
the organic bond of the aromatic heterocyclic ring or alicyclic ring and the linear alkane makes the ionic compound have excellent hydrophobicity, which can effectively prevent water in the environment from entering the inside of the perovskite material
Data Source
AI summary
Provided are an ionic compound and an application thereof, a perovskite precursor solution, a perovskite material, a solar material, a solar cell, and an electric apparatus. The ionic compound has a structure represented by any one of formulas (1) to (3). The ionic compound can improve the stability of perovskite materials and thus improve the efficiency and stability of solar cells.