IBC Solar Cell Doped Layout for Lower Leakage Loss
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Solution Overview
Problem
The photoelectric conversion efficiency of Interdigitated Back Contact (IBC) solar cells needs improvement due to structural limitations that affect the performance of the cells.
Innovation Solution
A solar cell design with first and second doped parts spaced apart and a third doped part on one side of the first electrode, differing in dopant type, which provides impurity absorption and reduces process interference, enhancing efficiency and yield.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the IBC cell structure with back contact is used, then the short-circuit current and conversion efficiency are improved, but the photoelectric conversion efficiency still needs improvement due to structural limitations
Solution Approach 1:
The patent segments the doped parts into multiple distinct regions (first doped parts, second doped parts, and third doped parts) with different dopant types and spatial arrangements. This segmentation allows each region to perform specific functions: first doped parts for primary charge separation, second doped parts for additional separation, and third doped parts for reducing recombination, thereby improving overall photoelectric conversion efficiency while managing structural complexity through functional specialization.
2Ease of manufacture
If the third doped part is added on the first doped part surface, then the process window for electrode preparation is increased and damage is reduced, but the device structure becomes more complex
Solution Approach 1:
The third doped part is formed on the surface of the first doped part before electrode preparation. This preliminary action creates a protective and functional layer that defines the electrode formation area, thereby increasing the process window for subsequent electrode preparation steps and reducing potential damage to underlying structures during manufacturing.
3Productivity
If the first and second doped parts are spaced apart, then electric leakage is reduced and photoelectric conversion efficiency is improved, but the area utilization is reduced
Solution Approach 1:
The patent applies local quality by creating spatially differentiated doped regions with specific dopant types and concentrations. The first and second doped parts are spaced apart in specific locations to reduce electric leakage where it occurs, while maintaining close spacing in other areas to preserve area utilization. This localized optimization allows efficiency improvement without excessive area loss.
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 improves photoelectric conversion efficiency by reducing electric leakage, process difficulty, and minimizing damage to doped layers, thereby increasing the quality and yield of the solar cells.
Implementation Method 1
a third doped part with a different dopant type on the first doped part's surface, which provides impurity absorption
Implementation Method 2
The respective second doped part is spaced apart from a first doped part adjacent to the respective second doped part, reducing electric leakage
Data Source
AI summary
A solar cell, a method for manufacturing the same, and a photovoltaic module are provided. The solar cell includes a substrate, first and second doped parts, and first electrodes. The substrate has a first surface including first regions and second regions arranged alternatingly in a first direction. Each of the first and second doped parts is located on a corresponding first and second region, respectively and is separated from each other. Each first electrode and a third doped part are located on the corresponding first doped part. On the first doped part, the third doped part is located on at least one side of the first electrode in the first direction and is separated from the adjacent first electrode. The first doped parts are doped with dope elements different from the second doped parts and the third doped parts.