Optical and structure properties of CH3NH3PbI3 perovskite films doped with Cesium A.M. El-naggar, Mohamed Bakr Mohamed, M.M. Osman, Zein K. Heiba, A.M. Kamal, A.M. Aldhafiri, Israa M. Alhamss and Anwar Q. Alanazi Eur. Phys. J. Appl. Phys., 96 1 (2021) 10302 Published online: 05 October 2021 DOI: 10.1051/epjap/2021210160