Laser Contact Opening (LCO) for PERC Solar Cells

Highest Yield by Contactless Wafer Handling and On the Fly Laser Processing

Laser structuring of PERC solar cells

In the LCO (Laser Contact Opening) process the protection of the sensitive front side of the cell is especially important. Scratching and contaminants impair the solar cell, sometimes beyond the limits of what is considered a good part, or they increase the Light Induced Degradation (LID). 3D-Micromac’s microCELLTM OTF utilizes ultrasonic sonotrodes for wafer handling for contactless transport through the system. With that, any imprints, microfissures and breakages caused by grippers, handling equipment or suction on the processing tables are a thing of the past.

The processing of the cells takes place “on the fly”. With that the time-consuming handling and positioning of the cells inside the machine becomes obsolete. Instead, the wafers are transported underneath the laser source on a conveyor. No stops are required to reposition the solar cells. The relative movements of the cells are automatically compensated by integrated optics during the laser structuring process. This optimally exploits the full capacity of the laser, enabling much higher throughput. With gross throughputs of 3,600 cells per hour, microCELLTM OTF lies roughly 10 percent higher than typical rates for comparable systems in the industry.

microCELL™ OTF relies on a laser source in the infrared range. Infrared laser sources cost less to acquire, last longer and require less maintenance. The achievable pulse frequencies are considerably higher than with green laser sources and ensuring a significantly higher throughput rate.

microCELL™ OTF

3D-Micromac‘s microCELL™ OTF is a highly productive laser system for processing of mono- and polycrystalline silicon solar cells. The microCELL™ OTF meets cell manufacturers‘ demands for increasing the efficiency, e.g. of PERC solar cells, by precise surface structuring, low operating costs, and highest availability. Laser processing on-the-fly and an innovative handling concept enable maximum throughput and yield in the mass production of crystalline solar cells. The contactless cell handling enables processing without surface defects and microcracks.

microCELLTM OTF offers:

  • On-the-fly laser processing with unbeatable cost-benefit ratio
  • Contactless wafer handling
  • High throughput and efficiency
  • Single lane system: > 3,800 wph
  • Dual lane system: > 8,000 wph
  • Low cost of ownership and CAPEX
  • Upgrade for existing production lines or expansion

microCELL™ OTF Downloads

microCELL™ OTF Dual Lane Download

Contact us now!

3D-Micromac AG

Frederick Bamberg
Product Line Manager Photovoltaics

Tel: +49 371 40043-432