Nonlinear Two-Photon Absorption in the Near-Infrared Band for Lead Bromide Perovskite Films Using an F-Scan Nonlinear Spectrometer

Edgar Rueda; Juan Serna; Jose Ignacio Uribe; Daniel Ramírez; Franklin Jaramillo; Jaime Osorio; Hernando García

doi:10.1021/acsomega.2c02967

Nonlinear Two-Photon Absorption in the Near-Infrared Band for Lead Bromide Perovskite Films Using an F-Scan Nonlinear Spectrometer

ACS Omega. 2022 Aug 9;7(33):29100-29105. doi: 10.1021/acsomega.2c02967. eCollection 2022 Aug 23.

Authors

Edgar Rueda¹, Juan Serna², Jose Ignacio Uribe^{3

4

5}, Daniel Ramírez³, Franklin Jaramillo³, Jaime Osorio⁴, Hernando García⁶

Affiliations

¹ Grupo de Óptica y Fotónica, Instituto de Física, Universidad de Antioquia UdeA, Calle 70 No. 52-21, Medellín 050010, Colombia.
² Grupo de Óptica y Espectroscopía, Centro de Ciencia Básica, Universidad Pontifícia Bolivariana, Cq. 1 No 70-01, Campus Laureles, Medellín 050031, Colombia.
³ Centro de Investigación, Innovación y Desarrollo de Materiales-CIDEMAT, Facultad de Ingeniería, Universidad de Antioquia UdeA, Calle 70 No. 52-21, Medellín 050010, Colombia.
⁴ Grupo de Estado Sólido, Instituto de Física, Universidad de Antioquia UdeA, Calle 70 No. 52-21, Medellín 050010, Colombia.
⁵ Ingeniush, Institución Universitaria Salazar y Herrera, Medellín 050034, Colombia.
⁶ Department of Physics, Southern Illinois University Edwardsville, Edwardsville, Illinois 62026, United States.

Abstract

An F-scan nonlinear spectrometer is used to measure the two-photon absorption coefficient for CH₃NH₃PbBr₃ perovskite films from 690 to 995 nm. This spectrometer uses an electrically focused tunable lens and a tunable femtosecond-pulse laser (Mai Tai-HP) with a resolution of 5 nm. Two-band models and saturation irradiance corrections are used to fit the experimental data. The nonlinear absorption in this wavelength range is of the order of cm/MW. We found that the best agreement between the experimental data, the reported values in the literature, and the theoretical model is obtained for an extended two-band model with irradiance saturation correction.