[Workshop of Photonics]
Laser Workstation For PV SOLLAS

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Description

National innovation prize 2010.
An industrial-research laser machine for c-Si solar cells. Equipped with cutting edge duet – femtosecond UV laser and nanosecond IR laser, Sollas is a multi-tasking system, designed for industrial-research or up to 3 MW/a capacity pilot manufacturing lines.

Laser processing of PV solar cells leads to:

  • Thinner wafers
  • Lower breakage rate
  • Precise depth control
  • ‘Cold processing’ using femtosecond lasers
  • Easily adjustable parameters facilitate process development
  • Selective ablation (due to different material response and controlled energy delivery)

Sollas performs 4 technological processes:

  • Selective SiNx/SiO2 removal
  • Back contact laser firing
  • Edge isolation
  • Laser marking
  • Other processes are integrated after feasibility tests

For selective SiNx/SiO2 removal, femtosecond UV laser source is used. This allows for very precise ablation of SiNx layer by causing minimal impact (direct or heat effect) on the Si layer – this extends the lifetime of carriers and allows avoiding micro cracks.

The other three processes are carried out by a nanosecond IR fiber laser, which is particularly characterized in fast processing.

Automated wafer handling and scanning system supports 5″ and 6″ diameter crystalline silicon (c-Si) wafers.
Integrated machine vision system and ability to adjust laser beam scanning field guarantees high repeatability and reliability.

System is equipped with a class-1 laser safety enclosure, integrated dust removal system to ensure dustless laser operation environment. Finally, system is controlled using flexible and user-friendly software ALTSE-SCA having production and research modes.

 

Feature

  • Selective SiNx/SiO2 removal
  • Back contact laser firing
  • Edge isolation
  • Laser marking
  • Other processes are integrated after feasibility tests

 


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