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Poly-Si Laser Thinning on the Rear Side of TOPCon-type Solar Cells
Application Scenarios
A laser beam irradiates the surface of the PSG layer and penetrates into the Poly layer.
The surface of the Poly layer absorbs the energy from the photons, converting it into heat.
This causes the surface of the Poly layer to undergo thermal expansion;
the resulting mechanical stress disrupts the structure of the PSG layer,
leading to a significant reduction in the density of the PSG.
Since the PSG structure is damaged following the laser treatment,
an alkaline wet etch can be used to remove the modified PSG material.
After the laser selectively acts upon the PSG in the non-metalized regions,
the duration of the alkaline etch can be precisely controlled
to sequentially remove the PSG, Poly, and SiO₂ layers in the non-gridline areas,
while etching down to a depth of 1–4 μm into the silicon substrate.
The Poly layer in the metalized regions remains intact, forming a "Poly-Finger" structure.
At the cell level, this process yields an efficiency gain of 0.15%; at the module level,
the primary benefit is manifested as an improvement in bifaciality.
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Dongguan Jiayi Intelligent Equipment Co., Ltd. was established in April 2009.
It is a comprehensive enterprise integrating R&D, manufacturing, and application services. In 2019,
the company obtained ISO 9001 Quality Management System certification.
The facility covers an area of 10,000 square meters and employs a workforce of over 120 individuals,
including a senior R&D and design team comprising more than 20 specialists.
The company is equipped with advanced precision inspection instruments—including equipment from API (USA)—and has
established long-term strategic partnerships with numerous universities and scientific research institutions.
We remain committed to introducing and assimilating advanced automation technologies from Germany and Japan to
continuously enhance the sophistication of our manufacturing processes.
We specialize in the R&D and production of linear modules, linear motors, DD motors, variable-pitch modules, electric slides,
multi-axis precision platforms, custom platform systems, and module components (such as ball screws and linear guides).
Additionally, we provide design, fabrication, and manufacturing services for custom non-standard automation equipment,
as well as modification and upgrade engineering for industrial automation production lines.
Our products currently serve a wide range of automation sectors, including lithium-ion batteries, photovoltaics,
energy storage systems, semiconductor manufacturing equipment, 3C electronics, solar energy systems,
medical devices, and automotive electronics.
