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- W2013180554 abstract "Customized solar cell processing based on input material quality has the potential to increase the performance of contaminated regions of multicrystalline silicon ingots. This provides an opportunity to improve material yield and device efficiency without substantially reducing the overall throughput. Simulations and experiments show that in wafers from the top and border regions of an ingot containing as-grown iron concentrations ≳10 <sup xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink>14</sup> cm <sup xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink>-3</sup> , a high concentration of interstitial iron point defects, i.e., Fe <sub xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink>i</sub> , remains after standard phosphorus diffusion gettering (PDG), severely limiting electron lifetime and simulated efficiencies of PERC-type solar cells. It is shown that an extended PDG leads to a stronger reduction of Fei point defects, enabling high-efficiency devices, even on wafers from the red zone of the ingot. However, a satisfactory performance improvement after standard PDG is already achieved on wafers that contain as-grown total iron concentrations <;10 <sup xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink>14</sup> cm <sup xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink>-3</sup> , making the low-throughput extended PDG process unnecessary for a large fraction of the ingot. We propose using the total iron concentration and the corresponding photoluminescence contrast between grain boundaries and intragranular regions in the as-grown wafer as a simple sorting metric to determine when extended phosphorus diffusion is warranted." @default.
- W2013180554 created "2016-06-24" @default.
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- W2013180554 date "2014-11-01" @default.
- W2013180554 modified "2023-09-27" @default.
- W2013180554 title "Sorting Metrics for Customized Phosphorus Diffusion Gettering" @default.
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- W2013180554 doi "https://doi.org/10.1109/jphotov.2014.2349736" @default.
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