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Integral characterization: Traceability from feedstock to cell

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By Dennis Schaffarzik, Calisolar GmbH; Dirk Zickermann, Calisolar GmbH; Jean Hummel, Director of Equipment, Calisolar Inc.

For a vertically integrated solar cell production starting with purification of silicon feedstock and ending with the production of solar cells, it is necessary to have control over all possible parameters that may affect yield, efficiency and product quality. This paper presents an approach for tracking products with minimal effort using a contactless technique. The method allows wafers to be virtually reconstructed into bricks and ingots, as well as recognizing the precursor wafer for each solar cell.

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Published in November 2011, the 14th edition of Photovoltaics International provides a variety of technical papers from some of the industry’s stalwarts. Features include: TÜV Rheinland on junction box testing; Laser Zentrum Hannover on laser edge isolation of mc-Si cells; Calisolar on the importance of traceability; Fraunhofer ISE on EWT cells; and EPIA on Europe’s LCOE.

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