Backside Poly Laser Thinning Machine For TOPCon Cells Ingenious Design

Equipment Introduction

The laser beam irradiates the PSG surface and penetrates into the Poly layer, where the surface of the Poly layer absorbs photon energy and converts it into heat, causing thermal expansion on the Poly layer surface; the force generated by the expansion destroys the PSG structure and significantly reduces its compactness, so the modified PSG can be removed by alkaline cleaning after laser treatment.

After the laser selectively acts on the PSG in non-metallic regions, the PSG, Poly and SiO₂in non-grid regions can be sequentially removed by controlling the alkaline cleaning time, etching down to 1-4 μm into the silicon substrate; the Poly in metallic regions is retained to form a Poly-Finger structure, achieving an efficiency gain of 0.15% at the cell level and mainly an improvement in bifaciality at the module level.

Highlights

» Multiple auxiliary functions to improve process performance

• Under-platform cooling system avoids high-temperature interference and delivers better process stability;

• Equipped with a dedicated dust removal hood with blowing-supping convection for higher cleanliness (patented);

• Supports various inspection functions including fragment detection, crack detection, and AOI inspection.

» Ingenious design to reduce transport defects

• Custom slotted belt and direct motor connection ensure higher stability and effectively prevent dust contamination;

• New flat belt effectively avoids defects such as scratches and indentations;

• Air knife on the jig removes fragments and prevents hidden cracks.

» Ingenious design to reduce transport defects

• Custom slotted belt and direct motor connection ensure higher stability and effectively prevent dust contamination;

• New flat belt effectively avoids defects such as scratches and indentations;

• Air knife on the jig removes fragments and prevents hidden cracks.

» Laser processing for various film structures

• Diverse technical routes and mask layer materials;

• Multiple customized laser sources to maximize matching with process requirements.

» Laser processing for various film structures

• Diverse technical routes and mask layer materials;

• Multiple customized laser sources to maximize matching with process requirements.

» Universal design with high compatibility

• Loading & unloading unit supports multiple feeding methods and various cassette sizes;

• Lifting-rotating structure with unique temporary storage position for empty cassettes;

• Supports various inspection functions including fragment detection, crack detection, and AOI inspection.

Technical Parameters

Founded in 2005, United Winners Laser Co., Ltd. is a leading supplier of laser welding equipment and intelligent manufacturing solutions in China. It is a national high-tech enterprise and a listed company on the SSE Star Market, specializing in R&D, production, and sales of precision laser welding machines and complete sets of laser welding equipment. It owns four subsidiaries, namely UW Jiangsu, UW Huizhou, UW Japan, and UW USA. After twenty years of business development and continuous technological innovation, the company has developed into a leader in China’s laser welding industry.

UW Laser is committed to providing high-quality lasers, laser welding heads, laser welding machines, robotic welding workstations, automated laser welding equipment and various non-standard automated solutions to global manufacturing customers. Lasers and laser welding machines mainly include blue laser series, hybrid laser series, YAG laser series, fiber laser series, semiconductor laser series, pulse laser series, etc. Its products are widely used in the fields of power batteries, automobile manufacturing, consumer electronics, hardware appliances, optical communications, medical equipment, plastic welding and soldering, and so on. At present, it has delivered more than 600 sets of non-standard customized automatic laser welding systems, which meet the welding requirements of more than 1,300 products. It is also China’s largest enterprise focusing on the research and development of laser welding in the new energy industry with strategic cooperation with CATL, Gotion High-Tech, BYD, GREE, Foxconn, Tyco Electronics, TE Connectivity, Evergreen Precision, EVE, Panasonic, Samsung, and other well-known enterprises across the industry.