TITLE:
Morphological and Optical Properties of Dimetallo-Phthalocyanine-Complex Thin Films
AUTHORS:
María Elena Sánchez-Vergara, Jose R. Álvarez-Bada, Carlos O. Perez-Baeza, Elías A. Loza-Neri, Ricardo A. Torres-García, Arturo Rodríguez-Gómez, Juan C. Alonso-Huitron
KEYWORDS:
Phthalocyanines; Organic Semiconductors; Thin Films; Optical Gap
JOURNAL NAME:
Advances in Materials Physics and Chemistry,
Vol.4 No.2,
February
13,
2014
ABSTRACT: In this work, the synthesis of semiconducting
molecular materials formed from metallo-phthalocyanines (MPcs) and bidentate amines is reported. Powder and thin-film samples of the
synthesized materials, deposited by vacuum thermal evaporation, show the same
intra-molecular bonds in IR-spectroscopy studies. The morphology of the deposited films was studied using scanning electron
microscopy and atomic force microscopy. The
optical parameters have been investigated using spectrophotometric measurements
of transmittance in the wavelength range 200 - 1100
nm. The absorption spectra in the UV-Vis region for the deposited samples
showed two bands, namely the Q and Soret bands. The optical band gap values of
the thin films were calculated from the absorption coefficient α in the absorption region and were
found to be around 1.4 - 1.6 eV. The dependence of the Tauc and Cody optical
gaps on the thickness of the film was also determined.