Preparation and Properties of CdTe Films on Mo/Glass Substrates

Abstract

Short-bandgap group II-VI compound cadmium telluride is widely used for the infrared optics, radiation detectors, and solar cells where p-type CdTe is needed. p-type conductivity of CdTe is mainly caused by the chlorine-based A-centers, and in part, by the less stable copper-oxygen complexes. As a rule, CdTe films are recrystallized by the help of a cadmium chloride flux that saturates CdTe with chlorine. In chlorine-saturated CdTe A-centers are converted to isoelectronic complexes that cause resistivity increasement of CdTe up to 9 orders of magnitude. Excess copper and oxygen or group I elements as sodium also deteriorate the p-type conductivity of CdTe like excess chlorine. p-type conductivity of CdTe can be restored e.g. by the vacuum annealing which removes excess chlorine from the film. Unfortunately, treatment that betters p-type conductivity of the CdTe film degrades the junction of the superstrate configuration cells. In this work we investigate possibilities to prepare p-type CdTe films on the molybdenum coated glass substrates. Samples were prepared by the vacuum evaporation and dynamic recrystallization of 6N purity CdTe on the top of Mo-coated glass substrates. Then samples were recrystallized with cadmium chloride flux under tellurium vapour pressure. Results of the test studies on the structure and electronic parameters of samples are presented and discussed.

This is a preview of subscription content, access via your institution.

References

  1. 1.

    V. Valdna and J. Hiie, Proceedings of the 17th European PVSEC, Munich, Germany, 2001, pp. 1233–1235.

  2. 2.

    V. Valdna, Solar Energy Materials & Solar Cells 87, 369 (2005).

    CAS  Article  Google Scholar 

  3. 3.

    V. Valdna, J. Hiie and A. Gavrilov, Solid State Phenomena 80-81, 155 (2001).

    CAS  Article  Google Scholar 

  4. 4.

    V. Valdna, Thin Solid Films 387, 192 (2001).

    CAS  Article  Google Scholar 

  5. 5.

    B.K. Meyer and W. Stadler, Journal of Crystal Growth 161, 119 (1996).

    CAS  Article  Google Scholar 

  6. 6.

    H.L. Hwang, Klaus Y.J. Hsu, H.Y. Ueng, Journal of Crystal Growth 161, 73 (1996).

    Article  Google Scholar 

  7. 7.

    O. Vigil-Galàn, E. Sànchez-Meza, C.M. Ruiz, J. Sastrè-Hernàndez, A. Morales-Acevedo, F. Cruz-Gandarilla, J. Aguilar-Hernàndez, E. Saucedo, G. Contreras-Puente, V. Bermùdez, Thin Solid Films 515, 5819 (2007).

    Article  Google Scholar 

  8. 8.

    V. Barrioz, S.J.C. Irvine, E.W. Jones, R.L. Rowlands, D.A. Lamb, Thin Solid Films 515, 5808 (2007).

    CAS  Article  Google Scholar 

  9. 9.

    M. Hädrich, N. Lorenz, H. Metzner, U. Reislöhner, S. Mack, M. Gossla, W. Witthuhn, Thin Solid Films 515, 5804 (2007).

    Article  Google Scholar 

  10. 10.

    Hartley, S.J.C. Irvine, D.J. Cole-Hamilton, N. Blacker, Proceedings of the 16th European PVSEC, Glasgow, UK, 2000, pp. 816–819.

  11. 11.

    N. Romeo, A. Bosio, V. Canevari, A. Podestà, S. Mazzamuto and G.M. Guadalupi, Proceedings of the 19th European PVSEC, Paris, France, 2004, pp. 1718–1721.

  12. 12.

    Romeo, D.L. Bätzner, H. Zogg and A.N. Tiwari, Proceedings of the17th European PVSEC, Munich, Germany, 2001, pp. 1043–1046.

  13. 13.

    Ilvydas Matulionis, Sijin Han, Jennifer A. Drayton, Kent J. Price, and Alvin D. Compaan, Mat. Res. Soc. Symp. Proc. 668, H8.23.1 (2001).

    Article  Google Scholar 

  14. 14.

    N. Romeo, A. Bosio, V. Canevari, M. Terheggen, L. Vaillant Roca, Thin Solid Films 431-432, 364 (2003).

    CAS  Article  Google Scholar 

  15. 15.

    V. Valdna, Solid State Phenomena 67-68, 309 (1999).

    CAS  Article  Google Scholar 

  16. 16.

    V. Valdna, Mat. Res. Soc. Symp. Proc. 607, 241 (2000).

    CAS  Article  Google Scholar 

Download references

Author information

Affiliations

Authors

Corresponding author

Correspondence to Vello Valdna.

Rights and permissions

Reprints and Permissions

About this article

Cite this article

Valdna, V., Grossberg, M., Hiie, J. et al. Preparation and Properties of CdTe Films on Mo/Glass Substrates. MRS Online Proceedings Library 1165, 824 (2009). https://doi.org/10.1557/PROC-1165-M08-24

Download citation