Izquierdo-Roca, V.; Caballero, R.; Fontane, X.; Kaufmann, C.A.; Alvarez-Garcia, J.; Calvo-Barrio, L.; Saucedo, E.; Perez-Rodriguez, A.; Morante, J.R.; Schock, H.W. "Raman scattering analysis of Cu-poor Cu(In,Ga)Se2 cells fabricated on polyimide substrates: Effect of Na content on microstructure and phase structure" Thin Solid Films 519, 21, pp. 7300 - 7303. 2011 DOI: 10.1016/j.tsf.2010.12.177