Halide Salt Synthesis for High-Purity Perovskite Solar Cells
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing methods for synthesizing metal halide salts and perovskite precursors often result in impurities, particularly tin (IV) cations, which reduce the efficiency and stability of perovskite solar cells due to defects and material degradation.
Innovation Solution
A method involving the reaction of metal at zero oxidation state with an organic acid and a diatom halogen in a solvent, controlling the molar ratios and temperatures to synthesize halide salts, which are then used to form high-purity perovskite inks and powders, minimizing impurities and optimizing perovskite solar cell performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional methods are used to synthesize metal halide salts and perovskite precursors, then production cost and ease of manufacture are maintained, but impurities such as tin (IV) cations form causing defects and reducing perovskite material purity
Solution Approach 1:
The patent applies preliminary action by adding the metal halide salt synthesizing agent and organic acid to the precursor mixture before the actual perovskite formation process. This pre-treatment step occurs during the precursor preparation phase, allowing impurities to be addressed before they can cause defects in the final perovskite material. The agent is incorporated into the precursor solution or powder, ensuring it is present when the perovskite crystallizes.
Solution Approach 2:
The patent uses an intermediary substance - a metal halide salt synthesizing agent (such as stannous fluoride, stannous chloride, or stannous bromide) combined with an organic acid. This intermediary reacts with tin (IV) cations and other impurities to form removable complexes or precipitates, thereby purifying the perovskite material without requiring extreme purification steps that would complicate manufacturing.
2Reliability
If impurities are present in perovskite precursors, then production cost is reduced, but defects and recombination centers form reducing efficiency and stability of PSCs
Solution Approach 1:
The patent converts the harmful presence of impurities into a beneficial purification process. By intentionally adding the metal halide salt synthesizing agent and organic acid, the system creates controlled reactions that target and remove impurities. The impurities, rather than simply being unwanted contaminants, become substrates for the purification chemistry, forming removable complexes or precipitates that can be easily separated.
Solution Approach 2:
The patent applies parameter changes by modifying the chemical environment through the addition of specific reagents (metal halide salt synthesizing agent and organic acid). This changes the solubility, reactivity, or complexation behavior of impurities, causing them to either precipitate out or form removable complexes. The parameters being changed include chemical composition, pH, and complexation equilibrium, all of which facilitate impurity removal while maintaining perovskite quality.
3Duration of action of stationary object
If environmental oxygen reaches perovskite material, then production simplicity is maintained, but oxidative degradation accelerates reducing lifespan of PSCs
Solution Approach 1:
The patent applies beforehand cushioning by incorporating the metal halide salt synthesizing agent and organic acid into the perovskite precursor mixture before device fabrication. This creates a protective chemical environment that cushions the perovskite material against oxidative degradation. The organic acid and metal halide agent form a protective matrix or surface layer that reduces oxygen penetration and mitigates oxidative stress on the perovskite crystalline structure.
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 method significantly reduces impurities in perovskite materials, enhancing the stability and efficiency of perovskite solar cells by maintaining improved purity levels and reproducibility, leading to increased Power Conversion Efficiency (PCE) and extended lifespan of photovoltaic devices.
Implementation Method 1
reacting a first reactant prepared from a mixture of metal at zero oxidation state (Me 0), organic acid and solvent, with a second reactant: diatom halogen (X 2 ), wherein a molar ratio of Me 0 :R(COOH) x :X 2 is within the range of 1:(0.5-2.0):(2.0-4.0)
Implementation Method 2
The particles of Me 0 are mixed with particles of the organic acid and/or solvent, and/or liquid Me 0 is added to the mixture of the organic acid and/or solvent
Implementation Method 3
a second component (AX) is introduced into said post-reaction system, in an amount effective for the perovskite precursor synthesis
Data Source
Figure 1~3
Figure 4
AI summary
A method for synthesizing halide salts of a Formula Mey+X-y, wherein Mey+ represents a cation of a metal having a valency y, and X- represents an anion of a halogen (X2). The method comprises reacting a first reactant comprising the metal at a zero oxidation degree (Me0) in a powder form and an organic acid (A) in a solvent (S), wherein the molar ratio of the metal (Me0) to the organic acid (A) is in the range of 0.1:1.0 to 2.0:1.0 with a second reactant being a diatom halogen: X2.