Conductive Paste Interconnection for Scribe-Free Perovskite Modules
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Solution Overview
Problem
The decomposition of perovskite materials during scribing processes in solar cell modules leads to material defects, affecting the lifespan of the modules.
Innovation Solution
A conductive paste composed of conductive particles, binder, and organic amine is used to form a conductive portion and insulating portions, enabling electrical connection and insulation through an etching reaction with the perovskite layer, thereby omitting scribing processes and reducing manufacturing steps.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If scribing processes (such as laser scribing) are used to achieve interconnection functionality between solar cell components, then electrical connection between cells is achieved, but perovskite materials decompose causing material defects and reduced module lifespan
Solution Approach 1:
The patent extracts and eliminates the harmful scribing process from the manufacturing workflow. Instead of using laser scribing to create interconnections, the invention uses a conductive paste applied directly to form connections, completely removing the decomposition-causing scribing step from the process sequence.
Solution Approach 2:
The patent changes the fundamental parameter of the interconnection method from thermal/laser-based scribing to chemical/electrochemical conductive paste application. This parameter change shifts the mechanism from high-energy laser ablation that decomposes perovskite to a gentler paste-based approach using organic amine salts that do not cause material decomposition.
2Ease of manufacture
If multiple scribing processes are employed to achieve interconnection functionality, then electrical connection is established, but the process complexity and manufacturing steps increase
Solution Approach 1:
The patent merges multiple separate functions into a single conductive paste application step. The paste simultaneously provides electrical connection, replaces the need for separate scribing processes, and eliminates the need for additional interconnection steps, thereby simplifying the overall manufacturing workflow.
Solution Approach 2:
The conductive paste performs multiple functions autonomously in a single application: it creates electrical pathways, provides interconnection between cells, and eliminates the need for subsequent scribing processes. This self-service capability reduces the number of manufacturing steps without requiring additional complex equipment or processes.
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 conductive paste enhances the service life of solar cell modules by minimizing defects and maintaining photovoltaic conversion efficiency while reducing process complexity.
Implementation Method 1
An etching reaction is performed with the conductive paste and the underlying perovskite layer to form a 2D perovskite layer and a conductive paste layer
Data Source
AI summary
Provided is a conductive paste including 30 wt % to 90 wt % of a conductive particle, 0.1 wt % to 10 wt % of a binder, 0.1 wt % to 2 wt % of an organic amine, and 10 wt % to 50 wt % of a solvent. A solar cell module and a manufacturing method thereof are also provided.