Solar cell module and method for manufacturing solar cell module
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Solution Overview
Problem
The output performance of a photoelectric conversion layer in solar cell modules degrades due to the ingress of water vapor and oxygen, particularly when using perovskite elements, and the sealing around extraction electrodes is prone to deterioration.
Innovation Solution
A solar cell module design with a sealing layer covering the first, second, and extraction electrode layers, featuring an opening for the extraction electrode, and a two-layer sealing structure with a getter layer to trap moisture and a barrier layer to prevent water vapor and oxygen ingress.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the photoelectric conversion layer is sealed to prevent water vapor and oxygen ingress, then the output performance is maintained, but the sealing performance around the extraction electrode deteriorates
Solution Approach 1:
The sealing structure is divided into multiple functional layers: a first sealing layer covering the photoelectric conversion layer and a second sealing layer covering the extraction electrode. This segmentation allows each layer to be optimized for its specific function, with the second sealing layer specifically designed to prevent water vapor and oxygen ingress around the extraction electrode while maintaining electrical connectivity.
Solution Approach 2:
The patent employs composite sealing structures combining different materials with complementary properties. The first sealing layer uses materials suitable for sealing the photoelectric conversion layer, while the second sealing layer uses materials that provide both sealing and electrical conductivity around the extraction electrode, creating a composite system that addresses multiple requirements simultaneously.
2Reliability
If a sealing layer is provided to cover the extraction electrode, then the sealing performance is improved, but the electrical connectivity is compromised
Solution Approach 1:
The sealing structure is segmented into a first sealing layer for the photoelectric conversion layer and a second sealing layer for the extraction electrode. The second sealing layer is specifically designed with openings or conductive pathways that maintain electrical connectivity while providing sealing functionality, thus resolving the contradiction between sealing and electrical connectivity.
Solution Approach 2:
The second sealing layer is designed with local variations in its structure and properties: it provides sealing coverage around the extraction electrode while incorporating conductive regions or openings at specific locations to maintain electrical connectivity. This local quality differentiation allows the same layer to simultaneously achieve both sealing and electrical conductivity functions.
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 design effectively suppresses the inflow of water vapor and oxygen, maintaining long-term good output performance by enhancing the sealing performance of the module.
Implementation Method 1
a photoelectric conversion layer provided on the first electrode layer
Implementation Method 2
a two-layer sealing structure with a getter layer to trap moisture and a barrier layer to prevent water vapor and oxygen ingress
Data Source
AI summary
A solar cell module includes a substrate, a first electrode layer provided to the substrate, a photoelectric conversion layer provided to the first electrode layer, a second electrode layer provided to the photoelectric conversion layer, an extraction electrode layer, and a sealing layer. The sealing layer has an opening in a region that corresponds to the extraction electrode layer. When the substrate is viewed in plan view from the surface where the photoelectric conversion layer is provided, the extraction electrode layer is exposed from the opening and the sealing part covers the peripheral edge part of the extraction electrode layer.