Effect of TiO2 structure on hysteretic behaviors in CH3NH3PbI3 perovskite solar cells William Elcock, Ali Abdolahzadeh Ziabari and Gap Soo Chang Eur. Phys. J. Appl. Phys., 99 (2024) 27 Published online: 16 October 2024 DOI: 10.1051/epjap/2024240090