Solar Cell Electrode Barrier Layer Design
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current solar cell designs face challenges in maximizing efficiency due to low efficiency rates and complex manufacturing processes, which need to be simplified to facilitate commercialization.
Innovation Solution
The solar cell design incorporates a semiconductor substrate with a tunneling layer, conductive areas, and electrodes structured to enhance photoelectric conversion efficiency, including a specific adhesive and barrier layer configuration to improve thermal expansion matching and prevent material diffusion, while simplifying the manufacturing process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple metal layers are deposited through electroless plating and electrolytic plating to enhance electrical coupling, then electrical conductivity is improved, but manufacturing complexity and process time increase
Solution Approach 1:
The patent extracts and eliminates the complex multi-step plating process (electroless plating + electrolytic plating) from the manufacturing sequence. Instead, it uses a simplified approach where a single metal layer is deposited directly on the conductive paste, removing unnecessary intermediate steps while maintaining electrical coupling efficiency.
Solution Approach 2:
The patent inverts the conventional plating sequence by depositing the metal layer directly on the cured paste without performing electroless plating first. This reversal of the standard process sequence simplifies manufacturing while achieving the same electrical coupling function.
2Reliability
If electrode transmission efficiency is increased through material selection and layer configuration, then charge transmission to electrodes is improved, but manufacturing complexity increases
Solution Approach 1:
The patent applies local quality by selecting specific metal materials (aluminum, silver, or copper) for the electrode layer based on local requirements for charge transmission. The conductive paste is also locally optimized with specific metal particles (silver, aluminum, copper) to match the electrode material, ensuring efficient charge transmission at critical interfaces without complicating the overall structure.
Solution Approach 2:
The patent makes the electrode structure universal by using the same basic configuration (conductive paste + single metal layer) for both n-type and p-type solar cells. The same process can deposit different metals (Al, Ag, Cu) depending on the application, providing multi-functionality without increasing structural complexity.
3Productivity
If solar cell efficiency is maximized through optimized layer and electrode design, then photoelectric conversion efficiency increases, but manufacturing simplicity is reduced
Solution Approach 1:
The patent applies preliminary action by pre-optimizing the conductive paste formulation with specific metal particles (silver, aluminum, or copper) before deposition. The paste is pre-cured to form a stable base layer, and then the metal layer is deposited in a single step. This preliminary preparation ensures high photoelectric conversion efficiency while keeping the subsequent manufacturing steps simple.
Solution Approach 2:
The patent optimizes efficiency by changing material parameters - selecting specific metals with appropriate work functions and conductivities for the electrode and paste layers. By adjusting the metal particle composition in the paste and the electrode layer material, the system achieves maximum photoelectric conversion efficiency. The single-layer metal deposition simplifies manufacturing compared to multi-layer approaches.
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
This configuration enhances the solar cell's efficiency by improving carrier collection and reducing electrical resistance, maintaining low resistance and adhesion with ribbons, thus increasing the solar cell panel's output and efficiency.
Implementation Method 1
the adhesive layer has a coefficient of thermal expansion that is greater than a coefficient of thermal expansion of the photoelectric conversion unit and is less than a coefficient of thermal expansion of the electrode layer
Implementation Method 2
solar cells are popular next generation cells to convert sunlight into electrical energy
Data Source
Figure 1
Figure 2~3
Figure 4
AI summary
Disclosed is a solar cell including a semiconductor substrate, a conductive area including first and second conductive areas disposed on one surface of the semiconductor substrate, and an electrode including a first electrode connected to the first conductive area and a second electrode connected to the second conductive area. The electrode includes an adhesive layer disposed on the semiconductor substrate or the conductive area, an electrode layer disposed on the adhesive layer and including a metal as a main component, and a barrier layer disposed on the electrode layer and including a metal that is different from the metal of the electrode layer as a main component. The electrode layer has a thickness greater than a thickness of each of the adhesive layer and the barrier layer, and the barrier layer has a higher melting point than a melting point of the electrode layer.