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Effect of Cu Deficiency on CuIn1-xGaxSe2 and High-efficiency Photovoltaic Solar Cells

  • Sung-Ho Han (a1) (a2), Falah S. Hasoon (a1), Joel W. Pankow (a1), Allen M. Hermann (a2) and Dean H. Levi (a1)...

Abstract

We report the results of our studies on the optical and electronic structure of a wide range of polycrystalline thin-film CuIn1-xGaxSe2 (CIGS) alloys. The composition range includes CIS and nearly stoichiometric (slightly Cu-poor) (24.3±0.3 at.% Cu) CIGS with x values located around the value that has the best efficiency (x ∼ 0.28). Relative to nearly stoichiometric CIS and CIGS, we find a reduction in the absorption strength in the spectral range 1-3 eV. This reduction can be explained in terms of the predominance of Cu 3d and Se 4p states at the valence band maximum (VBM). In addition, Cu-poor CIS and CIGS materials show an increase in bandgap because the p-d repulsive interaction in Cu-poor CIGS is less than that in nearly stoichiometric CIGS. High efficiency is discussed in terms of optical properties.

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1 Ramanathan, K., Contreras, M. A., Perkins, C. L., Asher, S., Hasoon, F. S., Keane, J., Young, D., Romero, M., Metzger, W., Noufi, R., Ward, J., and Duda, A., Prog. Photovolt. Res. Appl. 11, 225 (2003).
2 Contreras, M. A. et al. , 1994 IEEE 1st WCPEC Conf. Record of 24th IEEE PVSC, pp. 6875 (1995).
3 Persson, C. and Zunger, A., Phys. Rev. Lett. 91, 266401 (2003).
4 Alonso, M. I., Wakita, K., Pascual, J., Garriga, M., and Yamamoto, N., Phys. Rev. B 63, 075203 (2001).
5 Alonso, M. I., Garriga, M., Durante Rincön, C. A., Hernández, E., and León, M., Appl. Phys. A: Mater. Sci. Process. 74, 659 (2002).
6 A. Azzam, R. M. and Bashara, N. M., Ellipsometry and Polarized Light, 1st ed. (North-Holland, Amsterdam, 1977) p. 270283.
7 Lautenschlager, P., Garriga, M., Logothetidis, S., and Cardona, M., Phys. Rev. B 35, 9174 (1987).
8 Savitzky, A. and Golay, M. J. E., Anal. Chem. 36, 1627 (1964); J. Steinier, Y. Termonia, and J. Deltour, Anal. Chem. 44, 1906 (1972).
9 Han, S.H., Hermann, A. M., Hasoon, F. S., Al-Thani, H. A., and Levi, D. H., Appl. Phys. Lett. 85, 576 (2004).
10 Zhang, S. B., Wei, S.H., and Zunger, A., Phys. Rev. B 57, 9642 (1998).
11 Ramanathan, K. et al. , Prog. Photovolt. Res. Appl. 11, 225 (2003); C. H. Champness, Proceedings of the 29th IEEE Conference (IEEE, Piscataway, 2002), p. 732.

Effect of Cu Deficiency on CuIn1-xGaxSe2 and High-efficiency Photovoltaic Solar Cells

  • Sung-Ho Han (a1) (a2), Falah S. Hasoon (a1), Joel W. Pankow (a1), Allen M. Hermann (a2) and Dean H. Levi (a1)...

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