TiO2-B as an electron transporting material for highly efficient perovskite solar cells

The electron transporting layer plays an important role in charge extraction and transporting procedure for mesoscopic perovskite solar cells. Herein, the TiO 2 -B nanoparticles are used as an electron transporting material in perovskite solar cells for the first time which achieves a high efficiency of 18.83%. Furthermore, the effects of TiO 2 -B electron transporting layer on the nature of perovskite adsorption layer and the photovoltaic properties of devices are investigated in detail. As a consequence, the high efficiency can be ascribed to perovskite layer with a high crystallinity , resulting in suppressing charge recombination at interfaces, leading to favourable energy level alignment between perovskite and TiO 2 -B.