Theoretical and experimental aspects of the multi-exciton interactions in nanomaterials

• Grant number: 19/10869-0
• Support Opportunities: Scholarships in Brazil - Scientific Initiation
• Start date: October 01, 2019
• End date: September 30, 2020
• Field of knowledge: Physical Sciences and Mathematics - Physics - Atomic and Molecular Physics
• Principal Investigator: Lázaro Aurélio Padilha Junior
• Grantee: Gabriel Antoniassi de Souza
• Host Institution: Instituto de Física Gleb Wataghin (IFGW). Universidade Estadual de Campinas (UNICAMP). Campinas , SP, Brazil

Abstract

The strong spatial confinement felt by excitons in semiconductor nanomaterials results in intense Coulombic interactions between the charges. These interactions cause interesting effects, such as Auger recombination, which is a non-radiative decay process, and the shift of the energy of the exciton and bi-exciton due to the binding energy. In this project, the student will calculate the Coulomb interactions between confined charges using the effective mass model to describe the band structure in the nanomaterial. Using transient photoluminescence measurements, he will experimentally verify the bi-exciton binding energy and compare with his calculations.