Abstract
The effect of the amount of Na present during the 3-stage growth of CIGS at very low temperature T2 on polyimide (PI) foils is studied. While at higher growth temperatures Na seems to impede In-Ga interdifussion, at very low temperatures it appears to further the process. An increase in Voc for a higher Na concentration can be explained by a higher net carrier concentration as measured by drive level capacitance profiling. Admittance spectroscopy measurements show shallow defects when the Na concentration increases. These results suggest that the main role of Na could be the passivation of InCu donor deep defect, in agreement with Wei’s theory. Efficiencies of up to 15.1 % (0.5 cm2 active area with antireflection coating) and 13.6%, 14.1% (1 cm2 total and active area respectively without antireflection coating) for nominal T2=420° C were achieved on PI substrates so far.
This is a preview of subscription content, log in via an institution to check access.
Similar content being viewed by others
References
I. Repins, M.A. Contreras, B. Egaas et al., Progr. Photovol. Res. Appl. 16, 235 (2008).
C.A. Kaufmann, R. Caballero, T. Unold et al., Sol. Energy Mater. Sol. Cells, doi: 10.1016/j.solmat.2008.10.009.
D. Rudmann, D. Brémaud, H. Zogg and A.N. Tiwari, J. Appl. Phys. 97, 084903 (2005).
S. Ishizuka, H. Hommoto, N. Kido et al., Appl. Phys. Express 1, 092303 (2008).
A.M. Gabor, J.R. Tuttle, D.S. Albin et al., Appl. Phys. Lett. 65, 198 (1994).
C. A. Kaufmann, A. Neisser, R. Klenk et al., Thin Solid Films 480-481, 515 (2005).
R. Caballero, C.A. Kaufmann, T. Eisenbarth et al., Thin Solid Films 517, 2187 (2009).
R. Caballero, C.A. Kaufmann, T. Eisenbarth et al., Phys. Status Solidi A, doi: 10.1002/pssa.200881144.
S. Nishiwaki, T. Satoh, Y. Hashimoto et al., J. Mater. Res. Vol. 16, No. 2, 394 (2001).
D. Rudmann, A.F. da Cunha, M. Kaelin et al., Appl. Phys. Lett. 84 (7), 1129 (2004).
U. Rau, M. Schmitt, F. Engelhardt et al., Solid State Communications Vol. 107, No. 2, 59 (1998).
P.T. Erslev, J.W. Lee, W.N. Shafarmann et al., Thin Solid Films 517, 2277 (2009).
T. Eisenbarth, T. Unold, R. Caballero et al., Thin Solid Films 517, 2244 (2009).
S.H. Wei, S.B. Zhang and A. Zunger, J. Appl. Phys. 85, 7214 (1999).
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Caballero, R., Kaufmann, C.A., Eisenbarth, T. et al. Enhanced Efficiency of CIGS Thin Film Solar Cells on Polyimide Substrates. MRS Online Proceedings Library 1165, 210 (2009). https://doi.org/10.1557/PROC-1165-M02-10
Received:
Accepted:
Published:
DOI: https://doi.org/10.1557/PROC-1165-M02-10