Highly porous film of TiO2 nanoparticles synthesized using carbon nanospheres for highly efficient dye-sensitized solar cellsAmir Bayat, Esmaiel Saievar-Iranizad, Elham Bayatloo, Ali Zare, Ali Arabkhorasani and Sajad Saghaye PolkooEur. Phys. J. Plus, 135 2 (2020) 195DOI: https://doi.org/10.1140/epjp/s13360-020-00241-x