Large-Area Perovskite Layer Coating for Air-Stable Preparation
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Solution Overview
Problem
Perovskite materials are sensitive to moisture and oxygen, leading to defects and reduced performance in conventional preparation methods, making it difficult to prepare high-efficiency perovskite solar cells in air and adapt to humidity changes.
Innovation Solution
Dissolving perovskite raw materials in an ionic liquid or a mixture of ionic liquid and organic solvent to form a precursor, which is then coated onto a substrate, allowing preparation of a large-area perovskite layer in an air atmosphere, reducing moisture and oxygen influence.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If perovskite precursor solution is prepared using conventional solvents, then the preparation process is simple, but the solution absorbs moisture from air causing defects and reduced device performance
Solution Approach 1:
The patent uses ionic liquid as an inert solvent environment that does not absorb moisture from air like conventional organic solvents. The ionic liquid precursor solution maintains stability in air, preventing moisture-induced defects while keeping the preparation process simple, thus resolving the contradiction between ease of manufacture and device performance reliability.
2Reliability
If perovskite layer is prepared in glove box to avoid moisture and oxygen, then device performance is improved, but preparation complexity and cost increase
Solution Approach 1:
By using ionic liquid as the solvent, the patent creates an inherently moisture-resistant precursor solution that allows preparation in air rather than requiring glove box equipment. This maintains high device performance while dramatically reducing preparation process complexity and cost.
3Ease of operation
If perovskite precursor solution contacts moisture and oxygen in air, then preparation can be done in air, but oxidation occurs causing insufficient reactions and defects
Solution Approach 1:
The ionic liquid precursor solution provides an oxidation-resistant environment that allows the perovskite formation reaction to proceed completely even when exposed to air. This maintains manufacturing precision and reaction completeness while enabling easy preparation operation in air.
4Quantity of substance
If conventional solvents are used for perovskite precursor, then solubility is good, but moisture absorption leads to difficult-to-remove water in solution
Solution Approach 1:
The ionic liquid solvent provides both good solubility for perovskite precursors and inherent moisture resistance. The ionic liquid does not absorb water from air like conventional solvents, ensuring low moisture content in the precursor solution while maintaining excellent solubility for complete perovskite formation.
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
Enables efficient preparation of a uniform large-area perovskite layer suitable for industrial production, improving production efficiency and maintaining device performance.
Implementation Method 1
dissolving perovskite raw materials in an ionic liquid or in a mixture of the ionic liquid and an organic solvent to form a perovskite precursor
Implementation Method 2
coating the perovskite precursor onto a surface of a substrate to form the perovskite layer
Data Source
AI summary
The present application provides a large-area perovskite layer and a preparation method thereof. The preparation method includes: dissolving raw materials of a perovskite in an ionic liquid or in a mixture of the ionic liquid and an organic solvent, thereby forming a perovskite precursor, and coating the perovskite precursor onto a surface of a crystalline silicon bottom cell, thereby forming the perovskite layer.