Sn-doped TiO2 nanorod arrays and application in perovskite solar cells

Abstract

Tin-doped (Sn-doped) TiO₂ nanorods arrays were successfully synthesized on a TiO₂ seed layer via a mild one-pot hydrothermal method. Sn-doped TiO₂ nanorods with high electron mobility were assembled into a solid perovskite solar cell. The study indicated that the introduction of the Sn element led to the change of the TiO₂ band gap from 3.0 to 3.04 eV. Electrochemical impedance spectroscopy showed that the resistance of the device based on Sn-doped TiO₂ nanorods was lower than that of the undoped device. The PCE of the Sn-doped perovskite device achieved 6.31%, which was almost 67% higher than that of the undoped sample.