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K. Orgassa, Coherent Optical Analysis of the ZnO/CdS/Cu(In,Ga)Se2 Thin Film Solar Cell. D. Thesis, Universit¨ at Stuttgart, Germany (2004). 30, 31 23. U. Rau, Appl. Phys. Lett. 74, 111 (1999). 32 24. U. Rau, A. Jasenek, H. W. Schock, F. Engelhardt, T. Meyer, Thin Solid Films 361-362, 298 (2000). 32 25. R. H. Bube, Photolectronic Properties of Semiconductors (Cambridge University Press, Cambridge, 1992). 32 26. M. Turcu, O. Pakma, U. Rau, Appl. Phys. Lett. 80, 2598 (2002). 32 27. J. Reiß, J. Malmstr¨ om, A.

Again there is no fundamental difference between semiconductor / metal and semiconductor heterocontacts. For the latter, the band alignment is given by alignment of the charge neutrality levels. Unfortunately the charge neutrality levels have not been calculated for a large number of materials in thin film solar cells (see Fig. 1). In addition, the II-VI compound semiconductors CdTe, CdS and its multinary analogue Cu(In,Ga)(S,Se)2 have considerable ionicity and the Fermi level might therefore be not strongly pinned.

14, 20 4. W. M¨ onch, Semiconductor Surfaces and Interfaces (Springer Verlag, Heidelberg, 1993). 15 5. T. O. C. McGill, Band Offsets in Semiconductor Heterojunctions , in Solid State Physics edited by H. Ehrenreich and D. Turnbull (Academic Press, Boston 1992). 15 6. A. G. Van de Walle, Surf. Sci. Rep. 25, 1 (1996). 15 24 Andreas Klein 7. M. Peressi, N. Binggeli and A. Baldereschi, J. Phys. D 31, 1273 (1998). 15 8. J. Tersoff, Phys. Rev. Lett. 52, 465 (1984). 15 9. G. R. L. Cohen, Phys. Rev. B 15, 2154 (1977).

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