Colombara, D., Werner, F., Schwarz, T., Cañero Infante, I., Fleming, Y., Valle, N., et al. (2018). Sodium enhances indium-gallium interdiffusion in copper indium gallium diselenide photovoltaic absorbers. Nature Communications, 9: 826, pp. 1-12. doi:10.1038/s41467-018-03115-0.