Perspective Chapter: TiO2 Electron Transporting Layers for Perovskite Solar Cells

Abstract

TiO2 is a very useful material for the fabrication of solar cells such as dye-sensitized solar cells, quantum dot-sensitized solar cells, organic-inorganic hybrid solar cells, and perovskite solar cells. Among these, perovskite solar cells have been of great interest over the last decade because of their prominent properties such as high absorptivity, ambipolar charge transportability, convenient bandgap tunability, and solution processability. To obtain high-performance perovskite solar cells (PSCs), using effective electron transport layers (ETLs) of TiO2 is crucial to ensure efficient charge separation, which occurs mainly at the interface between the ETL structure and the perovskite photoactive layer. Therefore, this chapter will introduce TiO2 ETLs and cover how to prepare and modify the TiO2 ETLs to achieve high-efficiency perovskite solar cells.