Halide Containing Short Organic Monocations in n = 1–4 2D Multilayered Halide Perovskite Thin Films and Crystals - Université de Rennes Accéder directement au contenu
Article Dans Une Revue Chemistry of Materials Année : 2023

Halide Containing Short Organic Monocations in n = 1–4 2D Multilayered Halide Perovskite Thin Films and Crystals

Résumé

Low electronic band gap 2D multilayered (n=3,4) lead-iodide perovskites with formula A’2An‑1PbnI3n+1 and A’’An‑1PbnI3n+1 are of great interest for photovoltaics, with recent demonstrations of stable solar cell operation based on 2D/3D bilayered heterostructures. Still, the difficulty in achieving optimal phase control, with potential formation of mixed n-domains, is a limiting factor for photovoltaic performance of 2D/3D heterostructures, and the current choice for multi n- layered compounds is limited. Here we report synthesis and XRD characterization of novel (I‑EA)2MAn-1PbnI3n+1 (n=1-4) compound series, along with (Br‑EA)2PbBr4 (n=1) compound, incorporating iodo-ethylammonium (I-EA) and bromo-ethylammonium (Br-EA) spacers. These halide-featuring spacers lead to small lattice mismatch between the inorganic and organic components, that explains the successful formation of multi n- layered compounds. The presence of bromine or iodine in the interlayer space impacts on the dielectric and electronic properties of these materials. Periodic DFT simulations predict vertical hole effective mass for n=1 (I‑EA)2PbI4 as small as 1.8 me, comparable to popular organic semiconductors, like rubrene. UV-vis characterization sets the optical absorption onset of these materials around 1.71 eV for n=3 and 4, hence suggesting these compounds can be successfully implemented in 2D/3D photovoltaic architectures.

Domaines

Matériaux
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Dates et versions

hal-04064243 , version 1 (11-04-2023)

Identifiants

Citer

Alla Skorokhod, Claudio Quarti, Alexandre Abhervé, Magali Allain, Jacky Even, et al.. Halide Containing Short Organic Monocations in n = 1–4 2D Multilayered Halide Perovskite Thin Films and Crystals. Chemistry of Materials, 2023, 35 (7), pp.2873-2883. ⟨10.1021/acs.chemmater.2c03718⟩. ⟨hal-04064243⟩
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