Stable and Efficient Perovskite Solar Cells Based on Titania Nanotube Arrays

Highly ordered 1D TiO2 nanotube arrays are fabricated and applied as nanocontainers and electron transporting material in CH3NH3PbI3 perovskite solar cells. The optimized device shows a power conversion efficiency of 14.8%, and improved stability under an illumination of 100 mW cm-2. This is the best result based on 1D TiO2 nanostructures so far. © 2015 Wiley-VCH Verlag GmbH and Co. KGaA, Weinheim.