All solid-state solar cells based on CH3NH3PbI3-sensitized TiO2 nanotube arrays

• TiO2 NTAs were firstly used as photoanode in perovskite solar cell.
• CH3NH3PbI3 functions as both light absorber and hole conductor.
• The as-prepared CH3NH3PbI3 belongs to the cubic crystal system.

TiO2 nanotube arrays (TiO2 NTAs) were firstly used as photoanode in methylammonium lead iodide (CH3NH3PbI3) perovskite/TiO2 NTAs heterojunction solar cell, where CH3NH3PbI3 functions as both light absorber and hole conductor. The composition, structure and photoelectrochemical properties of the as-prepared samples were characterized by x-ray diffractometer (XRD), field-emission scanning electron microscope (FE-SEM), ultraviolet-visible (UV–vis) spectrophotometer and electrochemical workstation. The results indicate that the as-prepared CH3NH3PbI3 belongs to the cubic crystal system, and TiO2 NTAs sensitized by 0.3 M CH3NH3I and PbI2 exhibit the best photoelectrochemical properties with an open-circuit voltage of 0.422 V and a short-circuit current density of 173.4 μA cm−2. The EIS result shows that the extremely large resistance at CH3NH3PbI3/FTO interface contributes to the low current density of the perovskite solar cell.

TiO2 NTAs were firstly used as photoanode in CH3NH3PbI3 perovskite/TiO2 NTAs heterojunction solar cell, where CH3NH3PbI3 functions as both light absorber and hole conductor. Especially, the as-prepared CH3NH3PbI3 belongs to the cubic crystal system.Figure optionsDownload as PowerPoint slide