RETRACTED: Assembly of efficient Ag/n-Si/Cu2CdSnS4/Au for photovoltaic cell utilitiesHalemah I. El Saeedy, Hanan A. Yakout, Mona Mahmoud, Said A. Abdelaal and Mardia T. El SayedEur. Phys. J. Appl. Phys., 92 3 (2020) 30302DOI: https://doi.org/10.1051/epjap/2020200207