Perovskite Solar Module Encapsulation for Low-Temperature Lamination
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Solution Overview
Problem
Perovskite solar cells are vulnerable to thermal degradation and moisture, leading to performance deterioration and reduced efficiency in high-temperature processing, alignment issues cause reduced active surface area, and non-uniform deposition on textured substrates affect productivity.
Innovation Solution
A solar cell module with a low-temperature encapsulation structure using ethylene-vinyl acetate copolymer (EVA) resin for the first encapsulating material, olefin-based resin for the second, and butyl rubber for the third, along with a low-temperature lamination process to prevent thermal damage and ensure uniform deposition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the busbar electrode linewidth is reduced to improve photoelectric conversion efficiency, then the active surface area increases, but the alignment precision between busbar electrodes and ribbons becomes more critical and difficult to achieve
Solution Approach 1:
The patent applies preliminary action by pre-aligning the ribbons with the busbar electrodes before the lamination process. The low-temperature lamination then cures the encapsulation material while maintaining this pre-established alignment, preventing any thermal misalignment that would occur with high-temperature processes. This ensures accurate alignment is maintained throughout the manufacturing process.
Solution Approach 2:
The patent changes the temperature parameter to low temperature (below 150°C), which prevents thermal expansion and misalignment of components during the lamination process. This parameter change maintains the alignment precision achieved during assembly, even with reduced busbar electrode linewidth.
2Strength
If a conventional high-temperature tabbing process is used, then the ribbons are properly bonded to busbar electrodes, but the perovskite absorbing layer is thermally degraded
Solution Approach 1:
The patent changes the temperature parameter of the tabbing process from high temperature to low temperature (below 150°C, specifically 80-120°C). This parameter change allows the ribbon bonding to be achieved without thermally degrading the perovskite absorbing layer, thus resolving the contradiction between achieving proper ribbon bonding and maintaining perovskite layer stability.
Solution Approach 2:
The patent uses a low-temperature curable encapsulation material as an intermediary that enables the tabbing process to proceed at low temperatures. This intermediary material provides the necessary bonding strength for ribbon attachment without requiring high temperatures that would damage the perovskite layer.
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 solution prevents thermal degradation, maintains efficiency, improves reliability, and enhances productivity by ensuring accurate alignment and uniformity, while reducing water vapor transmission and moisture exposure.
Implementation Method 1
a water vapor transmission rate (WVTR) of the third encapsulating material is lower than that of the second encapsulating material, and a WVTR of the second encapsulating material is lower than that of the first encapsulating material
Data Source
AI summary
The present disclosure provides a solar cell module including solar cells, an interconnector, and an electro-conductive adhesive layer. Each of the solar cells includes a perovskite layer. The interconnector is configured to electrically connect the solar cells. The electro-conductive adhesive layer is disposed between the interconnector and at least one of the solar cells.