1. M.A. Contreras, B. Egaas, P. Dippo, J. Webb, J. Granate, K. Ramanathan, S. Asher, A. Swartzander, R. Noufi, in: Proceedings of the 26th PVSC 3, On the Role of Na and Modifications to Cu(In,Ga)Se2 Absorber Materials Using Thin-MF(M=Na, K, Cs) Precursor Layers, Sept 30–Oct 3 1997, pp. 359–362
2. Effects of Na incorporation on electrical properties of Cu(In,Ga)Se2-based photovoltaic devices on polyimide substrates;Urbaniak;Sol. Energy Mater. Sol. Cells,2014
3. M. Ruckh, D. Schmid, M. Kaiser, R. Schaffler, T. Walter, W. Schock, Influence of substrates on the electrical properteis of Cu(In,Ga)Se2 thin films, in: Proceedings of the 1st WCPEC, 1994, pp. 156–159
4. Na doping of CIGS solar cells using low sodium-doped Mo layer;Salomé;IEEE J. Photovolt.,2013
5. The effect of NaF on Cu(In, Ga)Se2 thin film solar cells;Granath;Sol. Energy Mater. Sol. Cells,2000