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Information × Registration Number 0225U002461, (0124U001306) , R & D reports Title Chiral framework materials for the needs of modern optoelectronics popup.stage_title Отримання нових каркасних матеріалів з хіральною структурою та матеріалів на їх основі. Head Kucheriv Olesya I., Кандидат хімічних наук Registration Date 12-03-2025 Organization Taras Shevchenko National University of Kyiv popup.description1 The goal of the project is the synthesis of chiral hybrid organic-inorganic perovskites from doubly (Pb2+, Sn2+, Ge2+) and trivalent (Bi3+, Sb3+) metal cations and chiral cations of amino acids (for example, arginine, asparagine, glutamine, histidine, tryptophan, tyrosine, etc.) with given types of crystal frameworks, which determine the semiconducting properties characteristic of hybrid perovskites; obtaining functional materials based on them (for example, quantum dots, thin films, polymer composites); establishing the crystal structure of hybrid perovskites; study of the main spectral characteristics of the obtained compounds and materials (establishment of the band gap, measurement of photoluminescence); establishing the regularities of the relationship between the crystalline structure of perovskite and its optical properties and developing, on this basis, original scientifically based approaches to the creation of a new series of compounds; analysis of the possibility of using the obtained compounds and materials in chiral optoelectronic devices (searching for combinations of such material properties as a small value of the band gap, high intensity of photoluminescence and the ability to easily form such functional forms as homogeneous thin films, quantum dots or large single crystals). popup.description2 Layered hybrid organic-inorganic perovskites exhibit a promising set of properties, including exceptional structural variability, enhanced moisture resistance, and optoelectronic characteristics valuable for practical applications. As a result, these materials are currently among the most studied for use in photovoltaic and optoelectronic technologies. During the initial stage of the project, a new series of layered hybrid perovskites was synthesized, where the metal cation was tin(II), and the organic cation was the protonated form of the amino acid histidine – (L-HisH)₂SnBrₓI₄₋ₓ (where L-His = L-histidine, x = 4, 3.37, 1.70, 0.56, 0.44, and 0). These compounds can achieve record-low bandgap values, which are atypical for 2D hybrid perovskites. All the synthesized hybrid perovskites possess a chiral structure due to the chiral L-histidinium cations. These cations are positioned between inorganic layers formed by tin halide octahedra connected in a "corner-to-corner" fashion. The synthesis of these compounds involved the introduction of mixed halogen anions, a method that enables deliberate tuning of the bandgap. This approach allowed the creation of a series of substances with bandgap values ranging from 1.82 to 3.05 eV. Producing semiconductor materials with adjustable optical bandgaps is key to the broader and more versatile application of these materials in the active components of modern optoelectronic devices.  Product Description popup.authors Kreiman Danylo S. Ovdenko Valeriia M. Petrosova Hanna R. Sirenko Valerii Yu. Semenikhin Oleksandr A. popup.nrat_date 2025-03-12 Close