Laser system keeps solar cell throughput high

3D-Micromac has supplied a laser system to Hanwha Q Cells for removing backside passivation on PERC cells. The Microstruct OTF laser system creates a selective opening of backside passivated multi- and mono-crystalline solar cells, thereby achieving a throughput of 3,600 wafers an hour.

The laser processing is made during the continuous transport of the cells under the laser source, whereby the relative motion of the cells is automatically compensated for. Stops for the positioning of the individual cells are completely eliminated. The handling of the solar wafers is contactless so the wafer surface remains unaffected. This ensures a gentle and frictionless transport of the wafers and also means cell breakage or micro cracks are reduced so a higher yield is achieved.

‘We are delighted that Hanwha Q Cells will further develop its Q.Antum cell technology manufacturing processes (PERC process) using 3D-Micromac equipment. This shows that our strategy of supporting cell manufacturers with our process know-how in the implementation and development of new cell technologies is paying off,’ stated Tino Petsch, 3D-Micromac CEO. He continued: ‘Moreover, following the successfully concluded qualification phase of our laser process, we are hopeful for follow-up orders from Hanwha Q Cells.’

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Analysis and opinion

By Dave MacLellan, Executive Director, AILU


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