The laser generates structures in surfaces with precision, without contact and with no force
The workpiece properties are hardly affected
The laser-structured oil lubricating cups on the tool surface influence its rubbing characteristics
Structuring alters the technical properties of
the surface. Such properties may include the surface’s reflectivity
or frictional properties.
To reduce friction, small depressions are produced in the
material. The depressions hold lubricants. They may be tiny
craters, produced by a single laser pulse. Deeper craters are
created by multiple laser pulses aimed at the same spot. For
some workpiece shapes, oblong depressions such as pockets
or short lines are used to achieve the desired frictional properties. Such depressions are made by positioning the
craters close to each other so that they overlap.
The edge insulation prevents a short-circuit on the edges of the solar cells – the degree of efficiency increases
In photovoltaics, short pulse lasers are used for edge
insulation, for drilling crystalline solar cells made
of silicon, or for structuring thin-layer solar cells.
The solar cells basically consist of a pn-transition,
whereby the emitter is only a few hundred nanometers
thick.
For production technological reasons
a short circuit occurs at the edges of the solar
cell which reduces its degree of efficiency. During
edge insulation the material
is vaporized, thus removing the charge carrier
responsible for the short circuit. This results in the
creation of 50 μm grooves with depths of
between 5 and 10 μm.
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