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International Journal of Photoenergy
Volume 2012, Article ID 385185, 6 pages
Research Article

Properties of Cu(In,Ga) S e 2 Thin Films and Solar Cells Deposited by Hybrid Process

1Department of Electrical and Computer Engineering, Old Dominion University, Norfolk, VA 23529, USA
2Wright Center for Photovoltaics Innovation and Commercialization, University of Toledo, Toledo, OH 43606, USA

Received 16 December 2011; Accepted 6 February 2012

Academic Editor: Peter Rupnowski

Copyright © 2012 S. Marsillac et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


Cu(In,Ga)Se2 solar cells were fabricated using a hybrid cosputtering/evaporation process, and efficiencies as high as 12.4% were achieved. The films were characterized by energy-dispersive X-ray spectroscopy, glancing incidence X-ray diffraction, scanning electron microscopy, auger electron spectroscopy, and transmittance and reflectance spectroscopy, and their properties were compared to the ones of films deposited by coevaporation. Even though the films were relatively similar, the ones deposited by the hybrid process tend to have smaller grains with a slightly preferred orientation along the (112) axis and a rougher surface. Both types of films have uniform composition through the depth. Characterization of these films by variable angle of incidence spectroscopic ellipsometry allowed for the calculation of the position of the critical points, via calculation of the second derivative of the dielectric function and fit with critical points parabolic band oscillators. The solar cells were then characterized by current-voltage and quantum efficiency measurements. An analysis of the diode parameters indicates that the cells are mostly limited by a low fill factor, associated mostly with a high diode quality factor ( 𝐴 1 . 8 ) and high series resistance ( 𝑅 𝑠 1 . 1 Ω - c m 2 ) .