Influence of 4-hydroxyphenethylammonium iodide on the characteristics of FAPbI3 thin films

Journal Article

2025

Published in: https://doi.org/10.1142/S0217984925502069

This work aims to tune the structural and optical features of formamidinium lead triiodide (FAPbI) perovskite thin films using 4-hydroxyphenethylammonium iodide (4-HOPhEtNH2 HI) additive. (4-HOPhEtNH2 HI)x films were fabricated via the spin coating route. All films have a cubic phase of -FAPbI3. As the 4-HOPhEtNH2 HI percentage rose up to 5%, the crystallite size grew to 59nm. After that, it reduced as the percentage of 4-HOPhEtNH2 HI rose further. The dislocation density decreased upon insertion of 4-HOPhEtNH2 HI in the films with a ratio up to 5% then it increased with further doping. As the amount of 4-HOPhEtNH2 HI increased, the lattice parameter fluctuated depending on the amount of 4-HOPhEtNH2 HI in the films. The effect of 4-HOPhEtNH2 HI doping amount on the absorbance, transmittance, and linear/nonlinear optical parameters of the films was examined. The direct bandgap energy ( of FAPbI3 is 1.51eV. As the films were doped with 10% 4-HOPhEtNH2 HI, the value increased up to 1.53 eV. After that, it was unaffected by increasing the amount of 4-HOPhEtNH2 HI in the films. Different empirical models were employed to calculate the refractive index of the films based on the computed value. The average refractive index values diminished with an increase of 10% in the quantity of 4-HOPhEtNH2 HI in the films, after which the changes were negligible. The values obtained utilizing the photoluminescence are in agreement with those obtained using Tauc’s relation. The photoluminescence intensity diminished marginally when the concentration of 4-HOPhEtNH2 HI increased in the films.

• Volume Number: 39
• Issue Number: 33
• Magazine \ Newspaper: Modern Physics Letters B
• Pages: 2550206