Proceedings of International Conference on Perovskite Thin Film Photovoltaics and Perovskite Photonics and Optoelectronics (NIPHO22)
DOI: https://doi.org/10.29363/nanoge.nipho.2022.001
Publication date: 11th November 2021
Ruddlesden-Popper low dimensional halide perovskites (2D) have recently attracted researchers’ attention thanks to their unique excitonic properties and superior environmental stability, triggering different exploitation in LED, photodetector, and photovoltaic devices. These materials differ from their 3D counterpart due to the presence of a bulky organic cation that separates the perovskite octahedra in n-dimensional layers connected each other by weak interactions, offering an ideal playground for easily modulating optical and structural properties by compositional and chemical modifications.
In this work, 2D perovskite with different halides composition (I-, Br-, Cl- mixtures) have been synthesized by mean of two different bulky organic cations (thiophene methylammonium -TMA, and thiophene ethylammonium -TEA) demonstrating the easy tunability of the optical properties of the materials as well as modifications in their crystalline structures. Indeed, halide substitution not only progressively modulates the bandgap, but it also proved to be a powerful tool to control phase segregation by rationally adjusting the halide composition, and therefore the spatial distribution of recombination at the nanoscale.
This turned out in the engineering of thin films of chloride-rich 2D perovskites, which appear transparent to the human eye, with tunable and intense emission in the green. This achievement is due to the substitution of Cl- with the bulkier I- in the halide site, that lead to structural distortion and spontaneous segregation resulting into a spatial distribution of phases where the minor component is responsible for the tunable emission, as identified by combined hyperspectral photoluminescence imaging and elemental mapping. This work could pave the way for the next generation of highly tunable transparent emissive materials which can be used as light emitting pixels in advanced and low-cost optoelectronics.
A.Z. and G.G. acknowledge the “HY-NANO” project that received funding from the European Research Council (ERC) Starting Grant 2018 under the European Union’s Horizon 2020 research and innovation program (Grant Agreement No. 802862).
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