Image: Dirk Mahler/Fraunhofer Isee
Scientists at the Fraunhofer Institute for Solar Energy Systems Isee have cultivated a method for measuring the performance of withdrawn solar cells that avoid contact in the production line.
The method is based on photoluminescence and contactless electroluminescentry images under different excitation conditions, as well as spectral reflection measurements.
It is able to measure the full power stress -characteristic curve of the solar cell, including performance parameters such as open circuit voltage, short -circuit current, filling factor and efficiency.
Dr. Johannes Greulich, group manager for inline solar cell analysis and simulation at Fraunhofer Isee, said that the contactless method is particularly suitable for measuring single-sided metallized solar cells, as well as the soil cells of Perovskiet-Silicon Tandem solar cells.
He also explained that the new method has shown a very good agreement in tests. “We are planning to develop the adjustments that are necessary for use in industrial mass production and to speed up the measurement of reverse behavior in a future research project with partners,” said Greulich.
A statement from Fraunhofer adds that eliminating physical contact with the solar cell time saves time, making considerably higher transit percentages in production. Fraunhofer Ise -director Dr. Ralf Preu suggests that the methodology opens the door to productivity increase of more than 10,000 waffles per hour and for the production of even thinner solar cells. “With this innovation we make a more cost -efficient large -scale production of solar cells of the next generation possible,” Preu added.
The methodology has also been cited as a way to eliminate mechanical stress on the solar cells during the measurement and reduces the maintenance costs of the measurement system.
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