The chemical environment about Cd atoms in Cd chemical bath treated CuInSe2 and CuGaSe2

P. Fons, K. Sakurai, A. Yamada, K. Matsubara, K. Iwata, T. Baba, Y. Kimura, H. Nakanishi, S. Niki

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4 Citations (Scopus)

Abstract

Recent reports in the literature have concluded that chemical bath deposited Cd (CBD-Cd) has beneficial effects on Cu(In, Ga)Se2 solar cell performance. Before detailed mechanisms explaining why this is so can be proposed, a key question that must be answered is where in the lattice the Cd atoms reside. We have used near-edge X-ray absorption fine structure (XANES) to selectively investigate the local atomic environment about Cd atoms in CBD-Cd treated polycrystalline CuInSe2 and CuGaSe2 films. CBD-Cd treated CuInSe2 and CuGaSe2 layers grown on Mo-coated glass substrates using the three-stage method were excited by synchrotron radiation at the Cd L3-edge (3537 eV) and the resulting XANES spectra were recorded. First-principles calculation using the code feff 8.10 show that the XANES spectra are consistent with Cd atoms being located in cation sites in the CuInSe2 matrix. From the current data it is not possible to definitively state to what extent Cd resides on the group I or III sites, but it is clear that there is a contribution from both, not from only Cu sites as has been previously speculated in the literature. This is also found to be consistent with predictions for ion-exchange reactions which show that Cd is more likely to substitute for (surface) In than Cu.

Original languageEnglish
Pages (from-to)1733-1735
Number of pages3
JournalJournal of Physics and Chemistry of Solids
Volume64
Issue number9-10
DOIs
Publication statusPublished - 2003 Sep 1
Externally publishedYes

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics

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    Fons, P., Sakurai, K., Yamada, A., Matsubara, K., Iwata, K., Baba, T., Kimura, Y., Nakanishi, H., & Niki, S. (2003). The chemical environment about Cd atoms in Cd chemical bath treated CuInSe2 and CuGaSe2. Journal of Physics and Chemistry of Solids, 64(9-10), 1733-1735. https://doi.org/10.1016/S0022-3697(03)00138-0