Perovskite Solar Cell Manufacturing with VOC-Controlled Crystallization
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Solution Overview
Problem
Conventional methods for manufacturing perovskite solar cells often result in pinholes in the photoelectric conversion layer, which degrade the cell's performance.
Innovation Solution
Control the gas concentration of volatile organic compounds in the vicinity of the application surface during the application of a poor solvent to suppress pinhole formation, maintaining a specific range of gas concentration to facilitate uniform crystal nucleation of the perovskite compound.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a poor solvent is sprayed onto the perovskite thin film to dry and crystallize it, then the photoelectric conversion layer is formed, but pinholes occur in the layer
Solution Approach 1:
The patent applies parameter changes by controlling the gas concentration of volatile organic compounds within a specific range (500-10000 ppm) during poor solvent application. This parameter control modifies the drying and crystallization process to prevent pinhole formation while maintaining layer uniformity, directly resolving the technical contradiction between manufacturing precision and reliability.
Solution Approach 2:
The patent introduces gas concentration control as an intermediary parameter between the poor solvent application and the final film quality. By mediating the interaction between solvent evaporation and perovskite crystallization through controlled VOC concentration, the method prevents direct harmful effects that cause pinholes while preserving the beneficial crystallization process.
2Ease of manufacture
If the precursor solution is applied and allowed to dry naturally, then the process is simple, but pinholes form in the photoelectric conversion layer
Solution Approach 1:
The patent introduces controlled poor solvent application as an intermediary step between precursor solution deposition and final film formation. This intermediate treatment, combined with gas concentration control, improves film quality without significantly complicating the manufacturing process, balancing ease of manufacture with manufacturing precision.
Solution Approach 2:
The patent applies preliminary action by controlling the gas environment before and during poor solvent application. By pre-establishing the appropriate VOC concentration range, the method ensures optimal conditions for pinhole-free film formation from the outset, preventing defects rather than correcting them later.
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 effectively reduces pinhole occurrence and enhances the uniformity of the photoelectric conversion layer, improving the solar cell's power generation performance and reducing surface roughness.
Implementation Method 1
applying a poor solvent having a lower solubility for the perovskite compound than that of a solvent of the precursor solution
Implementation Method 2
a material film of a perovskite thin film is applied, and then a gaseous or mist-like poor solvent is sprayed onto the material film of the perovskite thin film to dry and crystallize the material film
Implementation Method 3
a gas concentration of a volatile organic compound in a vicinity of the application surface
Data Source
AI summary
The present disclosure provides a method for manufacturing a perovskite solar cell that can suppress occurrence of pinholes. The present disclosure relates to a method for manufacturing a solar cell including a photoelectric conversion layer containing a perovskite compound. The method comprises: applying a precursor solution containing the perovskite compound as a solute over an application surface; and applying a poor solvent having a lower solubility for the perovskite compound than that of a solvent of the precursor solution over the application surface with the precursor solution applied, wherein a gas concentration of a volatile organic compound in a vicinity of the application surface is less than 15000 ppm at a timing when an application of the poor solvent is started.