Solar Cell Transparent Layer Layout for Damage-Free Cutting
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Solution Overview
Problem
Laser cutting of heterojunction solar cells generates laser damage zones and mechanical fracture zones, leading to efficiency loss and increased production costs due to the need for additional equipment and processing steps.
Innovation Solution
A solar cell structure with transparent conductive layers spaced apart and a region to be cut between them, using a mask plate to prevent electrical conducting channels, allowing for efficient cutting without debris formation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If laser cutting is used to divide solar cells to meet increasing power requirements, then photovoltaic modules can be formed with higher power capacity, but laser damage zones and mechanical fracture zones are generated causing efficiency loss
Solution Approach 1:
The patent divides the solar cell structure into multiple regions by spacing apart transparent conductive layers, creating distinct functional zones. The cutting regions are segmented away from the active cell areas, allowing laser cutting to occur in non-critical zones while preserving the integrity and efficiency of the main solar cell regions.
Solution Approach 2:
The patent extracts the cutting operation from the active solar cell areas by positioning cutting regions between spaced transparent conductive layers. This separation removes the harmful laser cutting process from the efficiency-critical zones, isolating the damage-generating operation to dedicated sacrificial or non-active regions.
2Reliability
If transparent conductive layers are spaced apart with cutting regions between them, then efficiency loss is reduced by preventing electrical conducting channels, but the device structure becomes more complex
Solution Approach 1:
The spaced transparent conductive layers serve multiple functions: they provide electrical conduction for solar cell operation, define cutting regions through their spacing, and protect underlying areas during laser processing. This multi-functionality reduces the need for additional separate components, offsetting the apparent structural complexity with functional integration.
Solution Approach 2:
The patent utilizes the spatial dimension created by spacing the transparent conductive layers apart, transforming a two-dimensional conductive layer into a three-dimensional structure with defined voids or gaps. This dimensional approach creates natural cutting zones without requiring additional complex masking or protection structures.
3Reliability
If the region to be cut is located between two adjacent first transparent conductive layers, then electrical conducting channels are prevented during cutting, but manufacturing precision requirements increase
Solution Approach 1:
The transparent conductive layers are pre-positioned and secured on the solar cell structure before the laser cutting operation. This preliminary placement establishes fixed reference points and defined cutting zones, allowing the laser to follow predetermined paths between the layers without requiring real-time precision adjustments, thereby reducing manufacturing precision demands during the actual cutting process.
Data Source
AI summary
A solar cell structure, a method for preparing a solar cell, and a mask plate. The solar cell structure includes a substrate, a first doped layer, and a plurality of first transparent conductive layers. The first doped layer is disposed on a surface of the substrate. The plurality of first transparent conductive layers are spaced apart from each other and disposed on a surface of the first doped layer away from the substrate. A region to be cut of the solar cell structure is located between two adjacent first transparent conductive layers.