Solar Cell Region Layout to Cut Optical Loss and Recombination
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Solution Overview
Problem
The photoelectric conversion efficiency of current solar cells is poor due to high optical loss and carrier recombination on the surface and inside the silicon substrate.
Innovation Solution
A solar cell design featuring a substrate with alternating electrode and non-electrode regions, where the non-electrode regions include first and second regions, with a dielectric layer and doped conductive layer only covering the electrode regions and second non-electrode regions, respectively, to reduce parasitic absorption and enhance light utilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a dielectric layer and doped conductive layer are formed over all non-electrode regions, then carrier recombination is reduced, but optical loss increases due to parasitic absorption
Solution Approach 1:
The patent applies local quality by differentiating the treatment of non-electrode regions into first regions (with dielectric and doped conductive layers) and second regions (without these layers). This localized approach ensures that passivation is applied only where needed for carrier recombination reduction, while avoiding parasitic absorption in light-trapping regions, thus resolving the contradiction between reliability improvement and energy loss prevention.
2Reliability
If the coverage area of dielectric layer and doped conductive layer is increased, then surface passivation is improved, but light utilization decreases
Solution Approach 1:
The patent implements local quality by selectively forming dielectric layers and doped conductive layers only in first regions of the non-electrode regions, while leaving second regions uncovered. This localized passivation strategy ensures that surface passivation is improved in areas where it is most needed, while light utilization is maintained in the uncovered second regions that are optimized for light trapping and absorption.
3Ease of manufacture
If uniform layers are formed over the substrate, then manufacturing is simplified, but photoelectric conversion efficiency is reduced due to parasitic absorption
Solution Approach 1:
The patent resolves the contradiction between manufacturing simplicity and energy loss by introducing a localized structure where dielectric layers and doped conductive layers are formed only in specific first regions rather than uniformly across all non-electrode regions. This approach maintains relative manufacturing simplicity while significantly reducing parasitic absorption in the light-trapping second regions, thereby improving overall photoelectric conversion 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 improves the short-circuit current and photoelectric conversion efficiency of the solar cell by reducing parasitic absorption and enhancing light utilization, while maintaining low parasitic absorption and improved transverse transmission.
Implementation Method 1
The solar cell is a device that converts light energy of the sun into electric energy. The solar cell can generate carriers by the photovoltaic principle
Data Source
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AI summary
A solar cell, a manufacturing method thereof, and a photovoltaic module are provided. The solar cell includes a substrate having electrode regions and non-electrode regions that are alternatingly arranged in a first direction, where the non-electrode regions of the substrate include a plurality of first regions and a plurality of second regions; a doped conductive layer formed over the dielectric layer; a passivation layer formed over the first regions and the doped conductive layer; and a plurality of electrodes.