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Na Doping of CIGS Solar Cells Using Low Sodium-Doped Mo Layer

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4 Author(s)
Pedro Salomé ; Ångström Solar Center, Division of Solid State Electronics, Department of Engineering Sciences, Uppsala University, 75121 Uppsala, Sweden ; Viktor Fjällström ; Adam Hultqvist ; Marika Edoff

Na plays an important role in the electrical performance of Cu(In,Ga)Se 2 (CIGS) thin-film solar cells. Traditionally, Na has been introduced during the growth of CIGS by thermal diffusion from the soda-lime glass (SLG) substrate; however, better control of the amount of Na is needed to have a more precise control of growth conditions. The introduction of Na into CIGS was studied in three different ways: from the SLG, from a NaF precursor, and from a Na-doped Mo (MoNa) back contact. The most successful approaches were obtained by using the conventional SLG and the NaF precursor. Different growth temperatures of CIGS were tested in an attempt to diffuse more Na from the MoNa layer.

Published in:

IEEE Journal of Photovoltaics  (Volume:3 ,  Issue: 1 )