Publicación:
Determination of the complex refractive index and optical bandgap of CH3NH3PbI3 thin films

No hay miniatura disponible
Fecha
2017
Autores
Guerra, J. A.
Tejada, A.
Korte, L.
Kegelmann, L.
Tofflinger, J. A.
Albrecht, S.
Rech, B.
Weingartner, R.
Título de la revista
Revista ISSN
Título del volumen
Editor
AIP Publishing
Proyectos de investigación
Unidades organizativas
Número de la revista
Abstracto
We report the complex refractive index of methylammonium lead iodide (CH3NH3PbI3) perovskite thin films obtained by means of variable angle spectroscopic ellipsometry and transmittance/reflectance spectrophotometry in the wavelength range of 190 nm to 2500 nm. The film thickness and roughness layer thickness are determined by minimizing a global unbiased estimator in the region where the spectrophotometry and ellipsometry spectra overlap. We then determine the optical bandgap and Urbach energy from the absorption coefficient, by means of a fundamental absorption model based on band fluctuations in direct semiconductors. This model merges both the Urbach tail and the absorption edge regions in a single equation. In this way, we increase the fitting region and extend the conventional (αℏω)2-plot method to obtain accurate bandgap values. © 2017 Author(s).
Descripción
Palabras clave
General Physics and Astronomy
Citación