Moving Beyond p-Type mc-Si: Quantified Measurements of Iron Content and Lifetime of Iron-Rich Precipitates in n-Type Silicon

Ashley E. Morishige, Friedemann D. Heinz, Hannu S. Laine, Jonas Schon, Wolfram Kwapil, Barry Lai, Hele Savin, Martin C. Schubert, Tonio Buonassisi

Research output: Contribution to journalArticleScientificpeer-review

1 Citation (Scopus)

Abstract

N-type multicrystalline silicon (mc-Si) is a promising alternative to the dominant p-type mc-Si for solar cells because it combines the cost advantages of mc-Si while benefiting from higher tolerance to transition metal contamination. A detailed understanding of the relative roles of point defect and precipitated transition metals has enabled advanced processing and high minority carrier lifetimes in p-type mc-Si. This contribution extends that fundamental understanding to Fe contamination in n-type mc-Si, helping enable processing of this material into an economical and high-performance photovoltaic device. By directly correlating micro-photoluminescence-based minority carrier lifetime mapping and synchrotron-based micro-X-ray fluorescence mapping of Fe-rich precipitates, we develop a quantitative, physical understanding of the recombination activity of Fe-rich precipitates in n-type mc-Si.

Original languageEnglish
Pages (from-to)1525 - 1530
Number of pages6
JournalIEEE Journal of Photovoltaics
Volume8
Issue number6
DOIs
Publication statusPublished - 2018
MoE publication typeA1 Journal article-refereed

Keywords

  • Charge carrier lifetime
  • Correlative microscopy
  • Iron
  • micro-photolumine-scence (μ-PL)
  • micro-X-ray fluorescence (μ-XRF)
  • n-type
  • Photovoltaic cells
  • Photovoltaic systems
  • precipitate
  • Silicon
  • silicon
  • synchrotron

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