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Modeling boron diffusion gettering of iron in silicon solar cells

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6 Author(s)
Haarahiltunen, A. ; Helsinki University of Technology, P.O. BOX 3500, FI-02015 TKK, Finland ; Talvitie, H. ; Savin, H. ; Yli-Koski, M.
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In this paper, a model is presented for boron diffusion gettering of iron in silicon during thermal processing. In the model, both the segregation of iron due to high boron doping concentration and heterogeneous precipitation of iron to the surface of the wafer are taken into account. It is shown, by comparing simulated results with experimental ones, that this model can be used to estimate boron diffusion gettering efficiency of iron under a variety of processing conditions. Finally, the application of the model to phosphorus diffusion gettering is discussed.

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Applied Physics Letters  (Volume:92 ,  Issue: 2 )