Solar Cell Layer Segmentation for Lower Optical Loss
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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 connection regions, first regions, and second regions, with a dielectric layer and doped conductive layer formed over specific regions 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 collection is improved, but optical loss increases due to parasitic absorption
Solution Approach 1:
The patent applies local quality by forming the dielectric layer and doped conductive layer only over specific portions of the non-electrode regions (connection regions) rather than uniformly across all non-electrode regions. This selective formation allows carrier collection to be enhanced at critical interfaces while minimizing parasitic absorption in areas where light transmission is more important, thus resolving the contradiction between carrier collection and optical loss.
2Reliability
If the surface area of connection regions is increased to improve carrier transmission, then transversal transmission is enhanced, but optical loss increases
Solution Approach 1:
The patent applies partial action by providing connection regions that traverse only a portion of the non-electrode regions rather than covering the entire area. The connection regions are designed with specific dimensions and positions to provide sufficient carrier transmission pathways without excessively increasing the total area occupied by conductive structures, thereby balancing transversal transmission enhancement with optical loss reduction.
3Reliability
If more layers are added to improve passivation and carrier collection, then photoelectric conversion efficiency is improved, but device complexity increases
Solution Approach 1:
The patent applies segmentation by dividing the non-electrode regions into distinct functional zones: connection regions where dielectric and doped conductive layers are formed for carrier collection, and other non-electrode regions where these layers are omitted to reduce complexity. This segmented approach allows different parts of the device to have different structural configurations optimized for their specific functions, improving overall photoelectric conversion efficiency without uniformly increasing device complexity across the entire structure.
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 ensuring efficient transversal transmission.
Implementation Method 1
reducing parasitic absorption and enhancing light utilization
Implementation Method 2
The solar cell is a device that converts light energy from the sun into electrical 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 connection regions, first regions, and second regions; a dielectric layer formed over the electrode regions, the second regions, and the connection 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.