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Keywords:

  • 61.14.Lj;
  • 61.72.Mm;
  • 68.37.Hk;
  • 68.55.Nq;
  • 73.50.Pz;
  • 73.61.Le

Abstract

Cross-sectional samples of CuIn1–xGaxSe2 layers grown by a three-stage process were studied by means of electron backscatter diffraction (EBSD) in completed thin-film solar cells. The microstructural analysis reveals a dependence of the average grain size on the gallium content x = [Ga]/([Ga] + [In]), with a maximum at x = 0.23. This result is correlated with structural measurements on CuIn1–xGaxSe2 powder samples showing that the ratio of the lattice constants c /a is equal to 2 for about the same x value. The pseudocubic crystal structure at about x = 0.23 may lead to reduced strain in the growing CuIn1–xGaxSe2 layer and therefore larger average grain sizes. (© 2008 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim)