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Keywords:

  • boron;
  • degradation;
  • oxygen;
  • silicon;
  • solar cells;
  • theory

Abstract

Thumbnail image of graphical abstract

We analyse the formation energy of interstitial boron (Bi) and the properties of the defect resulting from its association with an oxygen dimer (BiO2i) to evaluate the possibility that it may be the slow-forming centre responsible for the light-induced degradation of B-doped Si solar cells. However, we find that the formation energy of Bi is too high, and therefore its concentration is negligible. Moreover, we find that the lowest energy form of BiO2i is a shallow donor, and the deep donor form is high in energy.

Lowest energy structure of the BiO2i defect.