Crack resistance of bismuth ferrite films obtained on a flexible substrate

• Published in: E3S Web of Conferences Vol. 295; p. 4008
• Main Authors: Ramazanov, Shikhgasan, Ţălu, Ştefan, Sobola, Dinara, Orudzev, Farid, Ramazanov, Guseyn, Selimov, Daud, Kaspar, Pavel, Macků, Robert, Nazarov, Anton
• Format: Journal Article Conference Proceeding
• Language: English
• Published: Les Ulis EDP Sciences 01.01.2021
• Subjects: Atomic force microscopes; Atomic force microscopy; Atomic layer epitaxy; Bismuth; Bismuth ferrite; Bismuth oxides; Bismuth trioxide; Chemical analysis; Crack propagation; Ferric oxide; Iron oxides; Kapton (trademark); Mechanical properties; Microscopy; Morphology; Photoelectron spectroscopy; Photoelectrons; Piezoelectricity; Polyimide resins; Substrates; Thickness
• ISSN: 2267-1242; 2555-0403; 2267-1242
• DOI: 10.1051/e3sconf/202129504008

Ultrathin BiO x and FeO x layers were obtained by Atomic Layer Deposition (ALD) on the surface of a flexible Kapton substrate (poly (4,4’-oxydiphenylene-pyromellitimide)) at a temperature of 250 °C. The layer thickness was 50 - 100 nm. Surface morphology, electrical polarization, and mechanical properties were investigated by Atomic Force Microscope, Piezoelectric Force Microscopy and Force Modulation Microscopy. Chemical analysis was performed by X-ray Photoelectron Spectroscopy, where the formation of Bi2O 3 and Fe2O 3 phases, as well as intermediate phases in the Bi-Fe-O system, was observed. With a small increase in the Bi content of the film, the BFO / Kapton structure becomes more crack resistant. Modification of the Kapton surface with bismuth and iron oxides showed that such a composition exhibits multiferroic behavior.