Formamidinium Lead Iodide Perovskite Thin Films Formed by Two-Step Sequential Method: Solvent-Morphology Relationship.

Autor: Cimrová V; Institute of Macromolecular Chemistry, Czech Academy of Sciences, Heyrovského nám. 2, 162 00 Prague 6, Czech Republic., Guesmi M; Institute of Macromolecular Chemistry, Czech Academy of Sciences, Heyrovského nám. 2, 162 00 Prague 6, Czech Republic., Eom S; Department of Chemistry, Hanyang University, Seoul 04763, Republic of Korea., Kang Y; Department of Chemistry, Hanyang University, Seoul 04763, Republic of Korea.; Institute of Nano Science and Technology, Hanyang University, Seoul 04763, Republic of Korea.; Research Institute for Natural Sciences, Hanyang University, Seoul 04763, Republic of Korea., Výprachtický D; Institute of Macromolecular Chemistry, Czech Academy of Sciences, Heyrovského nám. 2, 162 00 Prague 6, Czech Republic.
Jazyk: angličtina
Zdroj: Materials (Basel, Switzerland) [Materials (Basel)] 2023 Jan 25; Vol. 16 (3). Date of Electronic Publication: 2023 Jan 25.
DOI: 10.3390/ma16031049
Abstrakt: Thin films made of formamidinium lead iodide (FAPbI 3 ) 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 PbI 2 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.
Competing Interests: The authors declare no conflict of interest.
Databáze: MEDLINE
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