Flexible perovskite photovoltaic modules and solar cells based on atomic layer deposited compact layers and UV-irradiated TiO2 scaffolds on plastic substrates

Recently, research on hybrid organometal halide perovskites for photovoltaic applications has delivered impressive growth in power conversion effi ciencies (PCEs) with a current certifi ed record of 17.9% and growing. [ 1–6 ] Key advantages of perovskites devices, together with high PCEs, are represented by the ease of the solution processing steps and their low temperature (<140 °C). [ 7,8 ] These values enable the fabrication on plastic substrates, [ 9 ] compatible with a continuous roll-toroll manufacturing which can potentially contribute to dramatically lower the production costs of large area modules. [ 10 ] Moreover, fl exible devices can also be conformed to curved surfaces to enhance power conversion densities. [ 11,12 ]