Perovskite Solar Cell Interlayer for Defect Passivation and Energy Matching
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Solution Overview
Problem
Existing perovskite solar cells face issues with Pb+ defects and energy mismatch between the perovskite and C60 material, leading to reduced performance parameters such as open-circuit voltage, fill factor, and short-circuit current density, which are not adequately addressed by previous methods like using ammonium-based materials or LiF layers.
Innovation Solution
Introduce an interlayer on the perovskite light absorption layer through a thermal evaporation process, using materials like lead sulfate (PbSO4), which improves interfacial properties and addresses defects and energy mismatch by forming a uniform thin film.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a solution process is used to form the perovskite light absorption layer, then the manufacturing process is simple and cost-effective, but coverage issues occur and defects remain on the perovskite surface
Solution Approach 1:
The patent changes the manufacturing parameter from solution process to thermal evaporation process. This parameter change allows for precise control of the interlayer thickness and composition, achieving uniform coverage and eliminating surface defects while maintaining manufacturing feasibility through a well-established evaporation technique
Solution Approach 2:
The patent introduces an interlayer as an intermediary component between the perovskite light absorption layer and the electron transport layer. This interlayer, formed via thermal evaporation, serves as a mediator that improves surface coverage uniformity and eliminates defects without affecting the overall manufacturing simplicity of the solar cell structure
2Reliability
If LiF layer is applied between perovskite and electron transport layer, then open-circuit voltage and fill factor are improved, but defect removal on perovskite surface is not improved and Li+ separation is hindered
Solution Approach 1:
The patent changes the material composition parameter from LiF to lead sulfate (PbSO4) for the interlayer. This parameter change enables simultaneous achievement of improved open-circuit voltage and fill factor along with effective surface defect removal and Li+ ion separation, as PbSO4 provides both the necessary energy level alignment and ionic separation properties
Solution Approach 2:
The patent uses lead sulfate as a composite interlayer material that combines multiple functions: energy level alignment with both perovskite and electron transport layer, surface defect passivation, and Li+ ion separation. This composite approach resolves the limitations of LiF by integrating multiple functional properties into a single material layer
3Manufacturing precision
If thermal evaporation process is used to introduce interlayer, then coverage issue is solved and uniform thin film is formed, but manufacturing complexity increases
Solution Approach 1:
The patent introduces an interlayer as an intermediary component that is formed via thermal evaporation. This interlayer serves as a mediator that improves thin film uniformity and coverage without significantly increasing manufacturing complexity, as the evaporation process is a standard technique that can be integrated into existing manufacturing workflows
Solution Approach 2:
The patent changes the formation method parameter from solution process to thermal evaporation process for the interlayer. This parameter change achieves superior thin film uniformity and coverage control while maintaining manufacturing feasibility, as thermal evaporation is a well-established technique that provides precise control over film thickness and composition
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
Enhances photoelectric conversion efficiency and durability by improving interfacial properties between the perovskite light absorption layer and electron transport layer, resulting in better performance parameters.
Implementation Method 1
forming an interlayer on top of the perovskite light absorption layer through a thermal evaporation process
Implementation Method 2
A solar cell converts solar energy into electrical energy, and generates electrical energy using the photovoltaic effect in which electrons and holes are generated by absorbing solar energy
Data Source
Figure 1~3
AI summary
The present invention relates to a perovskite photoelectric conversion device, a perovskite solar cell comprising same, and a manufacturing method therefor, the perovskite photoelectric conversion device having an interlayer introduced on one side of a perovskite light absorption layer through thermal evaporation.