VITRONIC – VINSPEC SOLAR – Wafer and solar cell inspection

VITRONIC – VINSPEC SOLAR – Wafer and solar cell inspection


Today, power comes from the sun. But few people
are actually capable of using the sun’s power effectively.
Key parameters for an effective solar module are high efficiency, durability and low cost.
As a result, automatic monitoring is a crucial factor for product quality.VITRONIC has just
the right tools – VINSPECsolar. It all starts with the wafer. Only a high
quality wafer can provide excellent module performance.
VINSPECsolar WIS inspects the geometry, edges and surface of the wafer.
Using infrared, VINSPECsolar WIS not only identifies micro-cracks precisely, but also
detects the granularity in multi and crystal fraction in quasi-mono wafers, and classifies
reliably. After texturization, the VINSPECsolarARC systems
identify process faults as deviations in the surface reflectivity as well as by measuring
the thickness of the anti-reflective coating and detecting irregularities in the coating.
Systematically and reliably. Thanks to a sophisticated line scan camera
setup, deviations in the metallization of the front side can be detected reliably with
VITRONICsolarPI. A shuttle takes the cell from the conveyor
belt. The right illumination is essential for the image to be assessed.
Two LED panels illuminate the surface. Another LED panel installed under the shuttle ensures
the edges to be captured precisely. The camera is positioned perpendicular to the cell, scans
the solar cell line by line and maps out the surface with a resolution of up to 20 µm,
creating a razor-sharp and detailed image. This makes it possible to reliably identify
faults in the metallization, coating and along the edges.
Our software is easy to use and highly effective. Its modular structure allows new requirements
to be easily integrated at short time. When inspecting the imprint on the back, VITRONIC
uses a matrix camera and special illumination technology to detect the wafer edges and print
contours, as well as three dimensional deformities such as bubbles and occlusions.
To do this, the VITRONICsolarPI system captures four images, each from a different lighting
angle. An relief image of the surface is then created. Breaks in edges, deviations in the
print surface as well as disruptions in the conductor are detected reliably.
Just like after metallization, VITRONIC also implements a line scan camera in the cell
tester for the front side inspection. The special feature – color cameras with
4 integrated sensor chips. VINSPECsolarCTS generates a color image from
three color lines – red, green and blue. An additional line is adapted especially for
the high reflectivity of the metallization. Both highly reflective and low-reflective
parts of the cell are captured in perfect detail.
This ensures reliable print and color classification of each individual solar cell–without manual
inspection at all. Now, the cells are ready to be processed (manufactured?)
into complete modules. VINSPECsolar systems are also used in module
production to inspect all relevant steps of production and make extensive automation possible.
During the input inspection on the stringer, VINSPECsolarMODUL determines the position
of the cells and checks their quality. On the complete string a comparable inspection
takes place with additional checks of the contacting.
Another VINSPECsolarMODUL system also recognizes position deviations and quality flaws, which
can occur during lamination. During final inspection in the flasher, VINSPECsolarMODUL
determines the power output of each individual cell and the entire module using electroluminescence.
State-of-the-art camera technology with well adapted software for each task.
Reliable data processing and assessment. Automation with high product quality.
And all this without manual sight inspection. The VINSPECsolar product family stands for
high-quality, longevity, and a competitive edge for your Photovoltaic products.

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