Search


Laser Cutting of Solar Cells

Laser Separating of Wafers and Glass Carriers

Mono and poly-crystalline silicon wafers can be cut with very high precision and low heat input using the same ablation process as for edge isolation and drilling. New approaches have shown that the so-called multi-pass cutting process creates edges with a better surface quality without using assist gas than cutting in a single step using a coaxial gas jet. With q-switched disc lasers, typically cutting speeds of up to 200 mm/s for a wafer thickness of 0.2 mm can be achieved. With wafer thicknesses above 400 microns in production environments with a low degree of automation, silicon wafers are not cut through, but engraved to a depth of 40 - 60% of material thickness. Subsequent breaking, either manual or fully-automated, is required to separate the wafer. Typical scribing speeds are in the range of 300 - 700 mm/s.

Flat glass is mostly cut by scribing and subsequent breaking. With this, splinterings and micro-cracks develop along the cutting contour reducing the bending strength of glass substrates significantly.

With the patented MLBA process laser radiation of a diode-pumped cw- YAG laser is absorbed within the volume of the glass by multiple reflexion. Within the heated glass a defined tension profile is generated, inducing a first crack.This crack ist then guided through the glass by relative movement between laser beam and glass panel and hence, separating the glass. This non-contact process creates micro-crack free edges and thus significantly enhancing mechanical stability of the solar cell panel. The MLBA process is also applicable for coated glass and even stacked glass can be cut in one processing step. Thus MLBA offers unique benefits compared to standard manufacturing techniques.

Laser Cutting of Mono and Poly-crystalline Solar Cells

Laser Cutting of Mono and Poly-crystalline Solar Cells

Cutting of silicon wafers and finished solar cells with very high precision and low heat input.

 

For these applications we recommend: PowerLine E

 

Laser Cutting of Thin Film Solar Cells

Laser Cutting of Thin Film Solar Cells

Laser cutting of glass in a single processing step without subsequent breakage.