Dissolution and gettering of iron during contact co-firing

The dissolution and gettering of iron is studied during the final fabrication step of multicrystalline silicon solar cells, the co-firing step, through simulations and experiments. The post-processed interstitial iron concentration is simulated according to the as-grown concentration and distributio...

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Bibliographic Details
Published in:Energy procedia 2011, Vol.8, p.257-262
Main Authors: Lelièvre, J-F., Hofstetter, J., Peral, A., Hoces, I., Recart, F., del Cañizo, C.
Format: Article
Language:English
Subjects:
co-firing step
defect engineering
extended gettering
iron
multicrystalline silicon
Rapid Thermal Annealing
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Summary:The dissolution and gettering of iron is studied during the final fabrication step of multicrystalline silicon solar cells, the co-firing step, through simulations and experiments. The post-processed interstitial iron concentration is simulated according to the as-grown concentration and distribution of iron within a silicon wafer, both in the presence and absence of the phosphorus emitter, and applying different time-temperature profiles for the firing step. The competing effects of dissolution and gettering during the short annealing process are found to be strongly dependant on the as-grown material quality. Furthermore, increasing the temperature of the firing process leads to a higher dissolution of iron, hardly compensated by the higher diffusivity of impurities. A new defect engineering tool is introduced, the extended co-firing, which could allow an enhanced gettering effect within a small additional time.
ISSN:1876-6102
1876-6102
DOI:10.1016/j.egypro.2011.06.133