In this work, we use periodic multilayered structures as scaffolds in order to magnify the effect of both the scaffold and the electron selective layer in perovskite solar cells, and understand their influence on cell performance.

In addition to the known effect of substrate on interfacial properties of perovskite films, here we show that bulk properties of Hybrid Lead Halide Perovskite films depend on the type of substrate used for film growth. Despite the relative large film thickness, ~600 nm, the roughness and nature of the substrate layer (glass, FTO, TiO 2 and PEDOT:PSS) affect not just the degree of preferential orientation and crystal grain size Raman peaks.The irreversible photoluminescence enhancement observed at low power with illumination time, also dependent on the substrate nature, is proposed to be due to the localization of the electron-hole excitons created in the vicinity of the light generated defects. The results shed light into the performance of the perovskite layer and help understanding how bulk processes, where ion migration is a conspicuous example, are severely affected by interfacial properties as those imposed by the substrate.

ABSTRACT:The use of self-assembled monolayers (SAMs) of fullerene derivatives reduces 11 the hysteresis of perovskite solar cells (PSCs

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Halide perovskite derivatives present unprecedented physical phenomena among those materials suitable for photovoltaics, such as a fast ion diffusion coefficient. Here we report how to take benefit from this property during the growth of halide perovskite in order to control the morphological and optoelectronic properties of the final thin film. Using a large enough halide reservoir, the nature of the halides present in the final perovskite layer can be exchanged respect the initial salt used in the two step deposition method. In particular, we report the preparation of methylammonium lead bromide (MAPbBr 3 ) thin film using a two-step method based on the transformation of PbI 2 , PbBr 2 and PbCl 2 salts into MAPbBr 3 perovskite after dipping in a MABr solution. The films prepared from different salts present different properties in terms of morphology and optoelectronic properties, thus providing significantly different performance when they are used for the preparation of photovoltaic devices. Interestingly, the use of PbI 2 and PbCl 2 salts reduce the charge recombination and increases the obtained open circuit potential, especially in the former case. However, the highest photocurrent is obtained when PbBr 2 is used. While for PbI 2 and PbCl 2 salts no traces of the former salt are observed in the obtained MAPbBr 3 layer after 10 minutes of dipping time, the presence of PbBr 2 still been detected when this salt is employed as it has been determined by Xray diffraction.2

Perovskite nanoparticles (PeNPs) have been extensively studied for optoelectronic applications, owing to their extremely high photoluminescence quantum yield, tunable band gap, and exceptionally narrow emission spectra. Therefore, PeNPs are considered excellent candidates for the development of high‐efficiency, low‐cost, wide‐gamut, and high‐purity color displays. However, their synthesis typically involves multistep cumbersome processes that might hinder commercial development. Herein, green light‐emitting diodes (LEDs) prepared by using all‐inorganic PeNPs CsPbBr3 synthesized at room temperature (RT) are reported and their performance compared with those prepared by a traditional hot‐injection method. Insights into the morphology and optoelectronic properties of RT PeNPs are provided through AFM and TEM and employing them in LEDs.

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Demonstration of the tuning of the dielectric confinement effect by the inclusion of a highly polarizable cation in 2D/3D perovskites.