Effect of sodium incorporation into CuInSe2 from first principles

L.E. Oikkonen, M.G. Ganchenkova, A.P. Seitsonen, R.M. Nieminen

Tutkimustuotos: LehtiartikkeliArticleScientificvertaisarvioitu

56 Sitaatiot (Scopus)
88 Lataukset (Pure)

Abstrakti

The presence of small amounts of sodium has been shown to improve the electronic performance of Cu(In,Ga)Se2 (CIGS) solar cells, but the origins of this effect have not yet been fully resolved. In this work, we have addressed the questions involving the role of sodium in CuInSe2 (CIS) using density-functional-theory-based calculations. We find no direct way how the creation of Na-related point defects in bulk CIS would enhance p-type conductivity. Instead, we demonstrate that Na reduces copper mass transport due to the capture of copper vacancies by NaCu defects. This finding provides an explanation for experimental measurements where the presence of Na has been observed to decrease copper diffusion. The suggested mechanism can also impede VCu-related cluster formation and lead to measurable effects on defect distribution within the material.
AlkuperäiskieliEnglanti
Artikkeli083503
Sivut1-5
JulkaisuJournal of Applied Physics
Vuosikerta114
Numero8
DOI - pysyväislinkit
TilaJulkaistu - 2013
OKM-julkaisutyyppiA1 Julkaistu artikkeli, soviteltu

Tutkimusalat

  • CuInSe2
  • density-functional theory
  • point defect

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