Estimation of the refractive index and dielectric constants of magnesium phthalocyanine thin films from its optical studies

摘要

Magnesium phthalocyanine thin films are prepared at room temperature by vacuum sublimation. The optical absorption and reflectance spectra of the films are studied. The absorption co-efficient alpha, and the extinction co-efficient k, are directly found from the spectral data. Graph of alpha~2 vs. hv is plotted and the optical band gap of the material is calculated. Using alpha and k, the refractive index n, the real and imaginary parts of the dielectric constant viz. epsilon_1 and epsilon_2 are also determined.