A simulation study on the effect of sodium on grain boundary passivation in CIGS thin-film solar cells

Abstract

3D numerical simulations of CIGS thin-film solar cells with different grain-boundary (GB) characteristics have been carried out in order to investigate the effect of defect properties and band edge shifts at GBs on the cell performance. Simulation results are compared with experimental data taken on cells with and without NaF post deposition treatment. GBs with different energy gaps and defect properties have been analyzed. Simulations support the idea that the detrimental effect of defective GBs on the cell performance might be reduced by a treatment with Na. The results of this study can help with the interpretation of experimental findings.

Authors 3

1. Giovanna Sozzi

   University of Parma

   Affiliation as printed

   University of Parma,Department of Engineering and Architecture,Parma,Italy,43124

2. Oana Cojocaru‐Mirédin Aachen Physikalisches Institut IA

   RWTH Aachen University

   Affiliation as printed

   Physikalisches Institut IA,RWTH Aachen,Aachen,Germany,52074

3. Roland Wüerz

   Zentrum für Sonnenenergie- und Wasserstoff-Forschung Baden-Württemberg

   Affiliation as printed

   Zentrum für Sonnenenergie- und Wasserstoff-Forschung Baden-Württemberg (ZSW),Stuttgart,Germany,70563