On the Hydrogenation of Poly-Si Passivating Contacts by Al2O3 and SiNx Thin Films

Bas van de Loo, Bart Macco, Manuel Schnabel, Maciej Stodolny, Agnes Mewe, David Young, William Nemeth, Paul Stradins, Wilhelmus Kessels

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62 Scopus Citations

Abstract

Doped polycrystalline silicon (poly-Si), when coupled with a thin SiO2 interlayer, is of large interest for crystalline silicon (c-Si) solar cells due to its outstanding passivating contact properties. To reach high levels of surface passivation, it is pivotal to hydrogenate the poly-Si and the underlying c-Si/SiO2 interface. This can be done by capping the poly-Si with a hydrogen-containing dielectric layer such as Al2O3 or SiNx, followed by a thermal anneal. On the basis of recent research, this work addresses several aspects of such hydrogenation by dielectric materials, including the effect of the annealing ambient, the thermal stability and reversibility of hydrogenation, the poly-Si doping level and c-Si surface texture. Additionally, the implementation of hydrogenation of poly-Si by dielectric materials in solar cells is discussed.

Original languageAmerican English
Article numberArticle No. 110592
Number of pages6
JournalSolar Energy Materials and Solar Cells
Volume215
DOIs
StatePublished - 15 Sep 2020

Bibliographical note

Publisher Copyright:
© 2020

NREL Publication Number

  • NREL/JA-5900-77237

Keywords

  • Hydrogen
  • Passivating contacts
  • Polysilicon
  • Solar cells
  • Surface passivation

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