Study of second-order nonlinear properties in lead-free double perovskite: Cs2AgIn0.9Bi0.1Cl6

• Grant number: 24/00905-8
• Support Opportunities: Scholarships in Brazil - Master
• Start date: July 01, 2024
• End date: June 30, 2026
• Field of knowledge: Physical Sciences and Mathematics - Physics - Condensed Matter Physics
• Principal Investigator: Cleber Renato Mendonça
• Grantee: Artur Barbedo
• Host Institution: Instituto de Física de São Carlos (IFSC). Universidade de São Paulo (USP). São Carlos , SP, Brazil
• Associated research grant: 18/11283-7 - Nonlinear photonics: spectroscopy and advanced processing of materials, AP.TEM

Abstract

Photonics is an area that studies the interaction between light and matter and related processes. Although part of the studies carried out in optics and photonics are inserted in the context of linear optics, with low-intensity light beams, the high-intensity regime provides effects that are very interesting for applications and fundamental knowledge. In this regime, nonlinear optics (ONL), numerous materials are presented that have good nonlinear responses, but the search for optimization, and even the discovery of new compounds is intense and aims to improve existing devices and innovate them technologically. . Inorganic materials are the subject of studies in different areas of knowledge; One class of these materials that has been gaining prominence are perovskites. This type of structure has shown to be very promising for applications in solar cells, white light-emitting diodes, as well as several other optoelectronic devices. Its structure provides important optical, electrical and magnetic characteristics for such applications. In this project, we intended to carry out important characterizations, both in linear and non-linear optics, focusing on first-order hyperpolarizability (²), which is related to ONL responses. Complementary spectroscopic techniques, such as x-ray diffraction (XRD), Raman spectroscopy, and XPS (X-ray photoelectron spectroscopy), will be used for linear studies, in addition to second harmonic generation and hyper-Rayleigh scattering (HRS, Hyper -Rayleigh Scattering) for non-linear studies. This work seeks to obtain information about the intrinsic and extrinsic properties, as well as nonlinear optical properties in perovskite thin films. Thus, the project has a high innovative character, both in terms of applications and from a fundamental point of view.