Optical constants manipulation of formamidinium lead iodide perovskites: ellipsometric and spectroscopic twigging.

ABSTRACT: Unraveling the knowledge of the complex refractive index and photophysical properties of the perovskite layer is paramount to uncovering the physical process that occurs in a perovskite solar cell under illumination. Herein, we probed the optical and photophysical properties of FAPbI₃ (FAPI) and Cs_0.1FA_0.9PbI₃ (CsFAPI) thin films deposited from pre-synthesized powder, by the spectroscopic ellipsometer and time-resolved fluorescence spectra. We determined the complex refractive index of perovskite films by fitting the measured spectroscopic ellipsometer data with the three-oscillator Tauc-Lorentz (T-L) model. We deduced that the CsFAPI thin film had a slightly lower absorption coefficient than the FAPI, but a higher refractive index and dielectric

SUBMITTER: Khan MT 

PROVIDER: S-EPMC11369667 | biostudies-literature | 2024 Oct

REPOSITORIES: biostudies-literature