Back-Contact Solar Cell Segmented Fingers for Shorter Current Paths
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Solution Overview
Problem
The long current transmission distance and large internal loss in back contact solar cells affect the photoelectric conversion efficiency due to the arrangement of electrode busbars and fingers, leading to increased resistance and reduced efficiency.
Innovation Solution
A solar cell design with first and second connection segments, where the first segments burn through the passivation layer to connect directly to the doped region, and the second segments do not, allowing for direct current collection and reduced transmission distance, thereby improving efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If electrode busbars and fingers are arranged on the back surface to avoid blocking the front surface, then the photoelectric conversion efficiency is improved, but the current transmission distance increases and internal loss increases
Solution Approach 1:
The electrode structure is segmented into first electrode regions with first electrode fingers for current collection, and second electrode regions with second electrode fingers for current transmission. This segmentation allows different parts of the electrode system to perform different functions, with the first region focusing on collection and the second region on transmission, thereby optimizing the overall current path and reducing internal loss.
Solution Approach 2:
The patent introduces a vertical dimension by having the first electrode fingers extend in a first direction and the second electrode fingers extend in a second direction that intersects with the first direction. This dimensional change creates a three-dimensional current collection and transmission network, reducing the current transmission distance by providing multiple pathways for current flow.
2Productivity
If electrode busbars and fingers are arranged on the back surface, then the front surface is not blocked, but the photoelectric conversion efficiency is reduced due to long current transmission distance
Solution Approach 1:
The electrode system is divided into multiple segments (first electrode fingers and second electrode fingers) that work together to reduce current transmission distance. The segmentation creates a distributed collection network that minimizes the distance electrons must travel, thereby improving photoelectric conversion efficiency.
Solution Approach 2:
The electrode configuration creates dynamic current pathways where current can flow through multiple routes from the first electrode regions to the second electrode regions. This dynamic routing optimizes the current flow paths based on the electrical potential distribution, reducing overall transmission distance and improving efficiency.
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 reduces current transmission distance and internal loss, enhancing the photoelectric conversion efficiency of the solar cell by optimizing current collection pathways.
Implementation Method 1
a solar cell body, where the solar cell body includes a substrate, a doped region formed on the substrate, and a passivation layer covering the doped region
Data Source
AI summary
The present disclosure discloses a solar cell and a photovoltaic module, and belongs to the field of photovoltaic technologies. An example solar cell includes a first pattern region, the first pattern region includes a plurality of first fingers extending along a first direction and arranged at intervals along a second direction, each of the first fingers includes a plurality of first connection segments disposed at intervals along the first direction and second connection segments connected between two adjacent first connection segments, and the second direction intersects with the first direction. A plurality of second connection segments are arranged at intervals along the second direction, and at least one of the first connection segments is disposed between two adjacent second connection segments. The first connection segments burn through the passivation layer and are electrically connected to the doped region, and the second connection segments do not burn through the passivation layer.