VENDORVIEW
Software
Process control is increasingly important in solar cell manufacturing due to growing production capacities. The menu-driven software included with the RFS-D system efficiently acquires and manages manufacturing data while integrating smoothly with IT networks.
In addition to a multilingual user interface and management of user groups, special Visu2 software opens up additional options from remote maintenance through to extensive traceability.
Results Very homogenous heat distribution is made possible for solar cell production thanks to the use of optimized IR radiator and convection concepts. In testing the transverse profile across the diagonal of a 156mm mc solar cell, measured on an RFS system. With a ∆T value of 5.5K, an outstanding value was achieved.
The variability and stability of the parameter settings make it possible to find an ideal process window for different paste systems. Fig 6 shows how users can significantly influence dwell times with a nearly identical maximum firing temperature by adapting IR radiator settings.
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It has been possible to produce good mc solar cells with 16.5% efficiency and a fill factor of greater than 78.8% at a speed of 5.0 meters per minute. Even at higher speeds of 5.8 meters per minute, it was possible to produce mc solar cells with 16.2% efficiency and a fill factor of greater than 78.9%. The best industrial mc solar cell achieved 16.5% efficiency and a fill factor of 80.1%.
Fig 5: Comparison of Temperature Profiles for Single and Separate Conveyor Systems
Fraunhofer ISE performed electro-luminescence measurements on behalf of Rehm Thermal Systems, on the basis of which statements can be issued regarding series resistance, as well as the homogeneity of the contacting process. Figure 12 shows the El-Rs images of three solar cells which were fired at different speeds. Very homogenous solar cells were produced with optimized process parameters.
A Corescan measurement was performed as well, which additionally confirmed good quality with regard to series resistance homogeneity.
The examinations also reveal that inhomogeneity of series resistance increases along with
Fig 6: Temperature Profiles for Different Conveyor Speeds
Fig 7: Transverse Profile
www.solar-pv-management.com Issue VI 2010
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