(Invited) Parallelized Nano-Pillar Perovskites for Semitransparent Solar Cells Using Anodized Aluminum Oxide Scaffold

Abstract

Semitransparent solar cells have attracted significant attention for practical applications, such as windows in buildings and automobiles. Here, we report semitransparent, highly efficient, one-dimensionally nano-structured perovskite solar cells employing anodized aluminium oxide (AAO) as a scaffold layer. The parallel nano-pillars in the perovskite layer enable construction of haze-free semitransparent devices without any hysteresis behaviour. By controlling the pore size in the AAO, the volume occupied by the perovskite layer can be precisely varied, and the colour neutrality of the resulting devices can be achieved. With the incorporation of a transparent cathodic electrode (indium tin oxide, ITO) with a buffer layer (MoOx), a highly efficient semitransparent nano-pillared perovskite solar cell is achievable with a power-conversion efficiency of 9.6% (7.5%) and a whole device average visible light transmittance of 29.7% (38.2%). To determine the role of the scaffold layer in improving the photo-electrical properties of the cell, impedance spectroscopy analyses were performed, revealing that the AAO-structured perovskite layer suppresses internal ion diffusion and enables critical improvements in long-term stability under continuous illumination.