SPLTRAK Abstract Submission
Na Diffusion and Device Performance of AgBr Treated CuGaSe2 Thin Films
Elizabeth Palmiotti1, Polyxeni Tsoulka2, Thomas Lepetit2, Nicolas Barreau2, Angus Rockett1
1Colorado School of Mines, Golden, CO, United States
/2Université de Nantes, Nantes, France

Previous work demonstrated that uniform CuGaSe2 (CGS) thin films with large grains could be grown using a short AgBr vapor treatment during growth. Devices made with this treated CGS showed better performance compared to devices made with standard material. Here, it is shown that AgBr treated CGS device performance worsens over time and is attributed to the suppression of Na diffusion. A NaF post-deposition treatment is shown to effectively introduce Na into the AgBr treated CGS film and prevent device degradation.