Numerical investigations of the impact of buffer germanium composition and low cost fabrication of Cu2O on AZO/ZnGeO/Cu2O solar cell performancesChristyves Chevallier, Sourav Bose, Sidi Ould Saad Hamady and Nicolas FressengeasEPJ Photovolt., 12 (2021) 3DOI: https://doi.org/10.1051/epjpv/2021003