Title:
Lifetime Enhancement in EFG Multicrystalline Silicon
Lifetime Enhancement in EFG Multicrystalline Silicon
Author(s)
Jeong, Ji-Weon
Rohatgi, Ajeet
Rohatgi, Ajeet
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Abstract
P and AI gettering and SiN-induced hydrogenation of EFG Si have been investigated using manufacturable
process techniques. Annealing of SiN coated EFG, without AI on the back, shows very little defect passivation with
maximum lifetime enhancement at 700°C. However, annealing of the SiN film, in the presence of AI, significantly increases the defect passivation and moves the optimum temperature to above 800°C. This increase in
the optimum temperature is the result of tradeoff between the increase in the release of hydrogen from the SiN film and the decrease in the retention of hydrogen at defects at high temperatures. A higher annealing temperature (>800°C) is desirable because it produces a superior AIBSF
without sacrificing defect passivation. Finally, it is shown that the efficacy of the gettering and hydrogenation process is a strong function of the as-grown lifetime, which dictates the final lifetime as well as cell efficiency.
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Date Issued
2000-09
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Text
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Proceedings