Advanced spectroscopy of nanomaterials: from ensemble to single-particle

• Grant number: 18/15574-6
• Support type: Research Grants - Young Investigators Grants- Phase 2
• Duration: May 01, 2019 - April 30, 2024
• Field of knowledge: Physical Sciences and Mathematics - Physics
• Principal Investigator: Lázaro Aurélio Padilha Junior
• Grantee: Lázaro Aurélio Padilha Junior
• Home Institution: Instituto de Física Gleb Wataghin (IFGW). Universidade Estadual de Campinas (UNICAMP). Campinas , SP, Brazil
• Associated research grant: 13/16911-2 - Advanced spectroscopy of novel nanomaterials, AP.JP

Abstract

In the last two decades, colloidal semiconductor nanostructures are among the most investigated materials due to their unique set of properties, including the control of their optical and electronic properties by engineering their shape, size and composition, that turns them promising candidates for application in a vast range of areas, such as, energy harvesting, lighting, and Medicine. This project aims to contribute to the continuing development of semiconductor nanomaterials. By using advanced time-resolved spectroscopy methods, we will investigate multi-exciton interactions, carrier dynamics, nonlinear optical processes, and electron-phonon interactions in novel classes of visible and near infrared emitting nanomaterials. Moreover, by creating new synthetic routes we will grow perovskite nanomaterials with controlled size and shape. In particular, we propose to use a unique set of time-resolved spectroscopy techniques, including transient absorption, transient photoluminescence (also in single-particle regime), and two-dimensional transient four-wave-mixing to obtain deep understanding of the photo-physical processes in these nanomaterials, from the ensemble to the single-particle regime. This will shine light on several scientific questions that are still under debate in the literature, and will serve as guide to the wise development of nanomaterials tailored for specific applications. By the end of this project we expect to have answered relevant questions regarding the photo-physics is several nanomaterials systems including, but not restricted to, perovskite nanoparticles, InP-base core/shell, PbS/ZnS quantum dots, and CuInSxSe2-x nanostructures. (AU)