P. Jackson, D. Hariskos, R. Wuerz, O. Kiowski, A. Bauer et al., Properties of Cu(In,Ga)Se 2 solar cells with new record efficiencies up to 21.7%, Phys. Status Solidi Rapid Res. Lett, vol.9, issue.1, pp.28-31, 2015.

P. Jackson, D. Hariskos, R. Wuerz, W. Wischmann, and M. Powalla, Compositional investigation of potassium doped Cu(In,Ga)Se 2 solar cells with efficiencies up to 20.8%, Phys. Status Solidi Rapid Res. Lett, vol.8, issue.3, pp.219-222, 2014.

A. Chiril?, P. Reinhard, F. Pianezzi, P. Bloesch, A. R. Uhl et al., Potassium-induced surface modification of Cu(In,Ga)Se2 thin films for high-efficiency solar cells, Nat. Mater, vol.12, issue.12, pp.1107-1111, 2013.

M. Gloeckler and J. R. Sites, Potential of submicrometer thickness Cu(In,Ga)Se 2 solar cells, J. Appl. Phys, vol.98, issue.10, p.103703, 2005.

C. Van-lare, G. Yin, A. Polman, and M. Schmid, Light coupling and trapping in ultrathin Cu(In,Ga)Se 2 solar cells using dielectric scattering patterns, ACS Nano, vol.9, issue.10, pp.9603-9613, 2015.

Z. Yu, A. Raman, and S. Fan, Fundamental limit of light trapping in grating structures, Opt. Express, vol.18, issue.S3, pp.366-380, 2010.

E. Yablonovitch, Statistical ray optics, J. Opt. Soc. Am, vol.72, issue.7, pp.899-907, 1982.

J. Malmström, O. Lundberg, and L. Stolt, Potential for light trapping in Cu(In,Ga)Se 2 solar cells, 3rd World Conference on Photovoltaic Energy Conversion, K. Kurokawa, pp.344-347, 2003.

A. ?ampa, J. Kr?, J. Malmström, M. Edoff, F. Smole et al., The potential of textured front ZnO and flat TCO/metal back contact to improve optical absorption in thin Cu(In,Ga)Se 2 solar cells, Thin Solid Films, vol.515, issue.15, pp.5968-5972, 2007.

M. Schmid, R. Klenk, M. Ch, M. Lux-steiner, J. Topi? et al., Modeling plasmonic scattering combined with thin-film optics, Nanotechnology, vol.22, issue.2, p.25204, 2011.

L. C. Andreani, P. A. Kowalczewski, C. I. Mura, M. Patrini, M. Acciarri et al., Towards CIGS slar cells with reduced film thickness: a study of optical properties and of photonic structures for light trapping, European Photovoltaic Solar Energy Conference and Exhibition, p.2334, 2012.

T. Koida, H. Fujiwara, and M. Kondo, Hydrogen-doped In 2 O 3 as high-mobility transparent conductive oxide, Jpn. J. Appl. Phys, vol.46, issue.28, pp.685-687, 2007.

D. J. Brémaud, Investigation and Development of CIGS Solar Cells on Flexible Substrates and with Alternative Electrical Back Contacts, 2009.

T. Koida, H. Fujiwara, and M. Kondo, Reduction of optical loss in hydrogenated amorphous silicon/crystalline silicon heterojunction solar cells by high-mobility hydrogen-doped In 2 O 3 transparent conductive oxide, Appl. Phys. Express, vol.1, p.41501, 2008.

K. Kushiya, CIS-based thin-film PV technology in solar frontier K.K, Sol. Energy Mater. Sol. Cells, vol.122, pp.309-313, 2014.

T. Koida, Y. Kamikawa-shimizu, A. Yamada, H. Shibata, and S. Niki, Cu(In,Ga)Se 2 solar cells with amorphous oxide semiconducting buffer layers, IEEE J. Photovolt, vol.5, issue.3, pp.956-961, 2015.