RETRACTED: Assembly of efficient Ag/n-Si/Cu2CdSnS4/Au for photovoltaic cell utilities Halemah I. El Saeedy, Hanan A. Yakout, Mona Mahmoud, Said A. Abdelaal and Mardia T. El Sayed Eur. Phys. J. Appl. Phys., 92 3 (2020) 30302 Published online: 17 December 2020 DOI: 10.1051/epjap/2020200207