Physical properties investigation of BiFeO3 multiferroic thin films and halide perovskites based on lead methylammonium iodide

• Grant number: 22/06618-5
• Support Opportunities: Research Grants - Visiting Researcher Grant - International
• Start date: September 16, 2022
• End date: October 15, 2022
• Field of knowledge: Engineering - Materials and Metallurgical Engineering - Nonmetallic Materials
• Principal Investigator: Eudes Borges de Araújo
• Grantee: Eudes Borges de Araújo
• Visiting researcher: Vladimir Shvartsman
• Visiting researcher institution: University of Duisburg-Essen, Essen, Germany
• Host Institution: Faculdade de Engenharia (FEIS). Universidade Estadual Paulista (UNESP). Campus de Ilha Solteira. Ilha Solteira , SP, Brazil
• Associated research grant: 17/13769-1 - Multiferroic and ferroelectric materials for energy converters: synthesis, properties, phenomenology and applications, AP.TEM

Abstract

Multiferroics and organic-inorganic halide perovskites are promising materials for developing new technologies to produce photovoltaic energy and meet the demand of modern society. The uncertainties about the contributions of intrinsic and extrinsic effects on the electrical, dielectric, optical, and photovoltaic properties of BiFeO3 thin films, and the low thermal stability and prone degradation of MAPbI3 perovskites in a humid atmosphere are the main challenges that need to be overcome to the applications of these materials in commercial devices. The present research project proposes studying the correlation between defects and the physical properties that lead to understanding the mechanisms responsible for maximizing these properties and increasing the photovoltaic response in these materials. The physical properties of BiFeO3 thin films with different levels of defects, such as fluctuations in stoichiometry, oxygen vacancies, bismuth vacancies, and iron vacancies, will be studied to establish the relationships that maximize these properties. In halide perovskites, the effects of guanidinium substitution and time aging on the physical properties degradation of the GAxMA1-xPbI3 system will be studied. (AU)