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Formamidinium lead iodide perovskite thin films formed by two-step sequential method: solvent-morphology relationship
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SYSNO ASEP 0567642 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Formamidinium lead iodide perovskite thin films formed by two-step sequential method: solvent-morphology relationship Author(s) Cimrová, Věra (UMCH-V) RID, ORCID
Guesmi, Mariem (UMCH-V) ORCID
Eom, S. (KR)
Kang, Y. (KR)
Výprachtický, Drahomír (UMCH-V) RID, ORCIDArticle number 1049 Source Title Materials. - : MDPI
Roč. 16, č. 3 (2023)Number of pages 13 s. Language eng - English Country CH - Switzerland Keywords perovskite ; formamidinium lead iodide ; morphology Subject RIV CD - Macromolecular Chemistry OECD category Polymer science R&D Projects GC20-15498J GA ČR - Czech Science Foundation (CSF) Method of publishing Open access Institutional support UMCH-V - RVO:61389013 UT WOS 000931069600001 EID SCOPUS 85147841586 DOI 10.3390/ma16031049 Annotation Thin films made of formamidinium lead iodide (FAPbI3) perovskites prepared by a two-step sequential deposition method using various solvents for formamidinium iodide (FAI) - isopropanol, n-butanol and tert-butanol, were studied with the aim of finding a correlation between morphology and solvent properties to improve film quality. They were characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM) and their photophysical properties were studied by means of absorption and photoluminescence (PL) spectroscopies. XRD patterns, absorption and PL spectra proved α-phase formation for all selected solvents. An excessive amount of PbI2 found in perovskite films prepared with n-butanol indicates incomplete conversion. Thin film morphology, such as grain and crystallite size, depended on the solvent. Using tert-butanol, thin films with a very large grain size of up to several micrometers and with preferred crystallite orientation were fabricated. The grain size increased as follows: 0.2–0.5, 0.2–1 and 2–5 µm for isopropanol, n-butanol and tert-butanol, respectively. A correlation between the grain size and viscosity, electric permittivity and polarizability of the solvent could be considered. Our results, including fabrication of perovskite films with large grains and fewer grain boundaries, are important and of interest for many optoelectronic applications.
Workplace Institute of Macromolecular Chemistry Contact Eva Čechová, cechova@imc.cas.cz ; Tel.: 296 809 358 Year of Publishing 2024 Electronic address https://www.mdpi.com/1996-1944/16/3/1049
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