Tetrazine molecules as an efficient electronic diversion channel in 2D organic-inorganic perovskites

• Published in: Materials horizons Vol. 8; no. 5; pp. 1547 - 156
• Main Authors: Lédée, Ferdinand, Audebert, Pierre, Trippé-Allard, Gaëlle, Galmiche, Laurent, Garrot, Damien, Marrot, Jérôme, Lauret, Jean-Sébastien, Deleporte, Emmanuelle, Katan, Claudine, Even, Jacky, Quarti, Claudio
• Format: Journal Article
• Language: English
• Published: Cambridge Royal Society of Chemistry 01.05.2021; the Royal Society of Chemistry
• Subjects: Charge transfer; Chemical Sciences; Chromophores; Condensed Matter; Conduction bands; Crystallography; Electron transfer; Electronic structure; Energy transfer; Excitons; Feasibility; Heterostructures; Material chemistry; Optical properties; or physical chemistry; Perovskite structure; Perovskites; Photoluminescence; Physics; Playgrounds; Synthesis; Theoretical and; Time dependence; energy transfer; DFT; halide perovskites; tetrazine; band alignement
• ISSN: 2051-6347; 2051-6355; 2051-6355
• DOI: 10.1039/d0mh01904f

Taking advantage of an innovative design concept for layered halide perovskites with active chromophores acting as organic spacers, we present here the synthesis of two novel two-dimensional (2D) hybrid organic-inorganic halide perovskites incorporating for the first time 100% of a photoactive tetrazine derivative as the organic component. Namely, the use of a heterocyclic ring containing a nitrogen proportion imparts a unique electronic structure to the organic component, with the lowest energy optical absorption in the blue region. The present compound, a tetrazine, presents several resonances between the organic and inorganic components, both in terms of single particle electronic levels and exciton states, providing the ideal playground to discuss charge and energy transfer mechanisms at the organic/inorganic interface. Photophysical studies along with hybrid time-dependent DFT simulations demonstrate partial energy transfer and rationalise the suppressed emission from the perovskite frame in terms of different energy-transfer diversion channels, potentially involving both singlet and triplet states of the organic spacer. Periodic DFT simulations also support the feasibility of electron transfer from the conduction band of the inorganic component to the LUMO of the spacer as a potential quenching mechanism, suggesting the coexistence and competition of charge and energy transfer mechanisms in these heterostructures. Our work proves the feasibility of inserting photoactive small rings in a 2D perovskite structure, meanwhile providing a robust frame to rationalize the electronic interactions between the semiconducting inorganic layer and organic chromophores, with the prospects of optimizing the organic moiety according to the envisaged application. Taking advantage of an innovative design concept, we present the synthesis of two novel two-dimensional (2D) hybrid organic-inorganic halide perovskites incorporating for the first time 100% of a photoactive tetrazine derivative as the organic component.