Proceedings of International Conference on Perovskite Thin Film Photovoltaics and Perovskite Photonics and Optoelectronics (NIPHO20)
Publication date: 25th November 2019
The coherent coupling of light and matter gives rise to the so-called strong coupling (SC) phenomenon, resulting in new hybrid light-matter states (polaritonic states). Besides its appealing applications in lasers, this phenomenon has specially attracted researcher’s attention since it allows to modify chemical reactions [1]. A simple structure to observe SC consists of two plane-parallel mirrors with an absorbing material in between, forming an optical cavity resonant with the emission wavelength of the emitting material inside the cavity. The SC is quantified by the Rabi splitting (Ω) which is the difference in energy among the new hybrid polaritonic states.
SC have been widely studied for atoms and organic molecules such as organic dyes [2] and more recently experiments also show SC for bulk hybrid inorganic-organic perovskite (MAPbI3) and all-inorganic perovskite (CsPbBr3) in the plane-parallel configuration, reaching Rabi splitting values of several hundreds of meV [3,4]. However, low dimensional perovskite single crystals, whose exciton properties can be tuned, have been less explored.
In this work, we theoretically investigate the possibility of observing the SC phenomenon for low-dimensional MAPbBr3 and MAPbI3 nanocrystals grown inside the nanopores of a metal oxide porous matrix, as previously synthetized in our group [5]. In particular, an optical cavity is fabricated enclosing a porous matrix of SiO2 which is embedded with the perovskite nanocrystals (panel a)). Through the analysis of energy vs momentum graphics (panel b)) and the study of concentration of perovskite nanocrystals inside the porous matrix, optimized conditions are determined to observe SC in the structure.
We conclude that stronger absorption and therefore larger variations on the refractive index of the perovskite nanocrystals is needed in order to achieve significant Rabi splitting values for the experimentally doable concentrations here considered.
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