Problem: Illumination systems for analysing surface properties are often located perpendicular to the inspected surface. Therefore, the solar cell has to be illuminated under a certain angle to improve the signal. As inline inspection becomes increasingly adopted for quality control in high-volume manufacturing, faster throughput with high precision is required.
Solution: Solar cell inspection tools based on the LIMO laser source operate with a single light source compared to other inspection tools using two light sources. That makes the tools more compact and reduces materials as well as assembly costs. A special advantage of an in-line inspection tool: The quality inspection of the solar cells occurs at the full production speed without interrupting the production. Those advantages guarantee high productivity and low cost per tested unit.
Applications: Solar cell inspection tools.
Platform: The 120 W fiber-coupled industrial laser system LIMO120-F400-SL808-103 is combined with the processing head IOS00019x-series. This device generates a homogeneously illuminated field under 35° angle of incident that fits to solar cell sizes up to 210 x 210 mm. The center wavelength of 790…808 nm is essential for the separation of excitation source and signal light. In addition, small bandwidth versions (< 1 nm) are available as an option.
Availability: June 2010 onwards.