AltSE Solar Cell Processing Workstation

Solar Cell Processing Workstation for industrial-research production lines

Keywords: solar cell, back contacts, emitter contacts, femtosecond laser, selective ablation, edge isolation, laser marking

AltSE is an industrial laser processing system for photovoltaic. Equipped with cutting edge duet - femtosecond UV and nanosecond IR lasers - AltSE stands for 4in1 solution:

- Selective SiN_x/SiO₂ removal
- Back contact laser firing
- Edge isolation
- Laser marking

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

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

System automated handling and scanning system supports 5" and 6" diameter crystalline silicon (cSi) wafers.
Integrated machine vision system and ability to adjust laser beam scanning field guarantees high repeatability and reliability.

Femtosecond laser advantages

- precise ablation
- minimal heat affected zone

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 industrial and research modes.

For more information, please refer to this whitepaper