Temperature dependence of band gap in hybrid perovskites: a first-principles study

• Grant number: 20/13172-8
• Support Opportunities: Scholarships in Brazil - Post-Doctoral
• Start date: October 01, 2021
• End date: April 09, 2023
• Field of knowledge: Physical Sciences and Mathematics - Physics - Condensed Matter Physics
• Principal Investigator: Alexandre Reily Rocha
• Grantee: Enesio Marinho da Silva Jr
• Host Institution: Instituto de Física Teórica (IFT). Universidade Estadual Paulista (UNESP). Campus de São Paulo. São Paulo , SP, Brazil
• Associated research grant: 17/02317-2 - Interfaces in materials: electronic, magnetic, structural and transport properties, AP.TEM

Abstract

Perovskite Solar Cells (PSC) based on hybrid organometallic halide perovskites are currently the most promising technologies for photovoltaics, mainly owing to the unprecedented growth in power conversion efficiency. These materials present excellent sunlight absorption, and good mobility and lifetime of charge carriers. However, the production in industrial scale of these PSC has important limitations, such as the instability of perosvkites in contact with environment humidity and high temperature. This postdoctoral project seeks to study the temperature-dependence on the electronic and optical properties of the main hybrid perovskites applied in the manufacture of PSC. The analyzes will be performed by ab initio calculations based on DFT, and Many Body Perturbation Theory (MBPT). Properties such as electron-phonon interaction, excitonic effects, and spin-orbit coupling will be analyzed in order to understand recent experimental results which show a monotonic growth of the band gap with increasing temperature, anomalous phenomenon to that verified in traditional semiconductors. The results obtained will be of great relevance in the scientific community, and may contribute to the development of photovoltaics based on hybrid perovskites both from the fundamental point of view as well as providing experimentalists with quantitatively accurate parameters. (AU)

Scientific publications

(The scientific publications listed on this page originate from the Web of Science or SciELO databases. Their authors have cited FAPESP grant or fellowship project numbers awarded to Principal Investigators or Fellowship Recipients, whether or not they are among the authors. This information is collected automatically and retrieved directly from those bibliometric databases.)

VILLEGAS, CESAR E. P.; MARINHO JR, ENESIO; DIAS, A. C.; VENEZUELA, PEDRO; ROCHA, ALEXANDRE R.. Optical properties of TiS₃ as a novel thin film for single-junction and tandem solar cells. SOLAR ENERGY MATERIALS AND SOLAR CELLS, v. 289, p. 8-pg., 2025-04-25. (17/02317-2, 20/13172-8, 21/13720-8, 21/14335-0)

MARINHO JR, ENESIO; VILLEGAS, CESAR E. P.; VENEZUELA, PEDRO; ROCHA, ALEXANDRE R.. Photovoltaic Efficiency of Transition Metal Dichalcogenides Thin Films by Ab Initio Excited-State Methods. ACS APPLIED ENERGY MATERIALS, v. 7, n. 3, p. 9-pg., 2024-01-19. (20/13172-8, 17/02317-2)

VILLEGAS, CESAR E. P.; MARINHO JR, ENESIO; VENEZUELA, PEDRO; ROCHA, ALEXANDRE R.. Optical spectra and exciton radiative lifetimes in bulk transition metal dichalcogenides. Physical Chemistry Chemical Physics, v. 26, n. 17, p. 10-pg., 2024-04-16. (20/13172-8, 21/13720-8, 17/02317-2, 21/14335-0)