Proceedings of MATSUS Spring 2024 Conference (MATSUS24)
DOI: https://doi.org/10.29363/nanoge.matsus.2024.086
Publication date: 18th December 2023
In recent years, hybrid organic-inorganic two-dimensional perovskites (2D PVKs) have attracted great interest due to the unique combination of intriguing properties at room temperature, making this class of semiconductors suitable for various optoelectronic applications. [1]
The alternating of organic and inorganic layers induces the formation of a natural multiple quantum well (MQW), offering the possibility to tailor the optical and structural properties of 2D PVKs acting directly on the chemical structure. In fact, by changing the elements of the metal-halide octahedra, it is possible to tune the band gap over a wide energy range, while varying the organic components enables a fine tuning of the MQW structure, introducing organic building blocks with new functionalities for the development of unexplored hybrid semiconductors. [2,4]
In this work, we modulate the structural distortion of novel 2D perovskites to design their optical characteristics and electrical band structure. We investigate the impact of the cation length and the ammonium binding group on the crystalline structure using interlayer cations with different characteristics. By doing so, we show that the exciton characteristics can be easily modified through careful organic cation design.
Furthermore, we integrate the developed PVKs single crystals into nanophotonic devices by synthesising microwires [5] that act as waveguides, in which strong light-matter coupling occurs between the optical modes of the crystal and the PVK exciton, with the generation of exciton−polaritons, the half-light half-matter quasi-particles that inherit unique properties from both excitons and photons.
The understanding of the structure-property relationship and the demonstration of new features can be exploited for the realization of compact, integrated optical devices with wide tunability.
This work was supported by the European Union - NextGeneration EU, "Integrated infrastructure initiative in Photonic and Quantum Sciences" - I-PHOQS [IR0000016, ID D2B8D520, CUP B53C22001750006] by the National and Quantum Science Technology (NQSTI) – Spoke 2 (CUP B53C22004180005, PE0000023), by the European Union - NextGeneration EU project “Network 4 Energy Sustainable Transition – NEST” (Project code PE0000021, CUP B53C22004060006, Concession Decree No. 1561 of 11.10.2022 adopted by Ministero dell’Università e della Ricerca), and by the ERC Consolidator project no. 101045746 — HYNANOSTORE.
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