Abstract
In thin film solar cells interfaces between lattice mismatched or dissimilar materials are used for the front and the back contact. A p-i-n device structure should be possible as most simple but ideally suited thin film solar cell. In contrast the interfaces in CdTe solar cells are found to be much more complex containing interdiffused phase boundaries at the front as well as at the back contact. By comparison to non-interdiffused interfaces using contact phases of adapted work functions it can be shown that the contact potentials of the front contact but also of the back contact are dominated by Fermi level pinning. The pinning states are evidently due to dislocation defects at the boundary of CdTe to the contact phases. Based on these results it is concluded that interdiffused phase boundaries or appropriate passivation layers are a precondition for efficient solar cells whenever strongly lattice mismatched or dissimilar materials are combined.
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References
P. V. Meyers, Photovoltaics Advanced Research and Development 1989, 19
A. Ennaoui, 2nd World Renewable Energy Congress, Vol.1 (Pergamon Press) Reading 1992 p.183
O. Lang, R. Rudolph, A. Klein, C. Pettenkofer, W. Jaegermann, J. Sanchez, A. Segura, and A. Chevy, in 13th European Photovoltaic Solar Energy Conference, Nice 1995 (H.S. Stephens), p. 2023.
P. Würfel, Physics of Solar Cells, (Wiley-VCH, Berlin) 2004
K. Ernst, R. Engelhardt, K. Ellmer, C. Kelch, H.-J. Muffler, M.-C. Lux-Steiner, and R. Könenkamp, Thin Solid Films 2001, 387, 26.
T. Schulmeyer, J. Fritsche, A. Thißen, A. Klein, W. Jaegermann, M. Campo, and J. Beier, Thin Solid Films 2003, 431/432, 84.
V. Valdna, F. Buschmann, and E. Mellikov, J. Cryst. Growth 1996, 161, 164.
X. Wu, S. Asher, D. H. Levi, D. E. King, Y. Yan, T. A. Gessert, and P. Sheldon, J. Appl. Phys. 2001, 89, 4564.
A. Klein and T. Schulmeyer, in Wide Gap Chalcopyrites, Springer Verlag, Heidelberg in press.
a) W. Jaegermann, in Photoelectrochemistry and photovoltaics of layered semiconductors (Eds: F. Lévy) Vol. 14, Kluwer Academic Publishers, Dordrecht 1992, 195 b) A. Klein, Adv. Sol. State Phys. 2004, 44, 13.
J. Fritsche, D. Kraft, A. Thißen, T. Mayer, A. Klein, and W. Jaegermann, Thin Solid Films 2002, 403–404, 252.
J. Fritsche, T. Schulmeyer, D. Kraft, A. Thißen, A. Klein, and W. Jaegermann, Appl. Phys. Lett. 2002, 81, 2297.
J. Fritsche, T. Schulmeyer, A. Thißen, A. Klein, and W. Jaegermann, Thin Solid Films 2003, 431/432, 267.
J. Fritsche, A. Thißen, A. Klein, and W. Jaegermann, Thin Solid Films 2001, 387, 158.
J. Fritsche, S. Gunst, A. Thißen, R. Gegenwart, A. Klein, and W. Jaegermann, Mater. Res. Soc. Symp. Proc. 2001, 668, H5.1.
J. Fritsche, D. Kraft, A. Thissen, T. Mayer, A. Klein, and W. Jaegermann, Mater. Res. Soc. Symp. Proc. 2001, 668, H6.6.
S. Tiefenbacher, C. Pettenkofer, and W. Jaegermann, J. Appl. Phys. 2002, 91, 1984.
F. Säuberlich and A. Klein, Mater. Res. Soc. Symp. Proc. 2003, 763, B9.10.
F. Rüggeberg and A. Klein, Appl. Phys. A (in press)
W. Mönch, in Semiconductor surfaces and interfaces of Springer, Berlin 1995.
R. H. Bube, in Photovoltaic Materials (Eds: R. C. Newman) Vol. 1 of Series on Properties of Semiconductor Materials, Imperial College Press, London 1998.
D. L. Bätzner, R. Wendt, A. Romeo, H. Zogg, and A. N. Tiwari, Thin Solid Films 2000, 361–362, 463.
L. J. Brillson, S. Chang, J. Shaw, and R. E. Viturro, Vacuum 1990, 41, 1016.
I. M. Dharmadasa, Prog. Crystal Growth and Charact. 1998, 36, 249.
D. Kraft, B. Späth, J. Fritsche, A. Klein and W. Jaegermann, (in preparation)
B. E. McCandless and J. R. Sites, in Handbook of Photovoltaic Science and Engineering, John Wiley & Sons, Chichester 2003, 617.
S.-H. Wei and S. B. Zhang, Phys. Rev. B 2002, 66, 155211.
D. Grecu, A. D. Compaan, D. Young, U. Jayamaha, and D. H. Rose, J. Appl. Phys. 2000, 88, 2490.
K. D. Dobson, I. Visoly-Fisher, G. Hodes, and D. Cahen, Sol. Energy Mat. Sol. Cells 2000, 62, 295.
P. von Huth, J. E. Butler, W. Jaegermann, and R. Tenne, Journal of the Electrochemical Society 2002, 149, G55
D. Kraft, U. Weiler, A. Thissen, Y. Tomm, A. Klein, and W. Jaegermann, Thin Solid Films 2003, 431/432, 382.
T. M. Duc, C. Hsu and J. P. Faurie, Physical Review Letters 1987, 58, 1127.
D. Rioux, D. W. Niles and H. Hochst, J. Appl. Phys. 1993, 73, 8381.
B. Späth, J. Fritsche, A. Klein and W. Jaegermann, Thin Solid Films (2005) 480–481, 204
B. Späth, J. Fritsche, A. Klein and W. Jaegermann, contribution F8.3
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Jaegermann, W., Klein, A., Fritsche, J. et al. Interfaces in CdTe Solar Cells: From Idealized Concepts to Technology. MRS Online Proceedings Library 865, 61 (2004). https://doi.org/10.1557/PROC-865-F6.1
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DOI: https://doi.org/10.1557/PROC-865-F6.1