Electrical and optical properties of C 46H 22N 8O 4KM (M [dbnd]Co, Fe, Pb) molecular-material thin films prepared by the vacuum thermal evaporation technique

Abstract

In this work, the synthesis of new materials formed from metallic phthalocyanines (Pcs) and double potassium salt from 1,8-dihydroxianthraquinone is reported. The newly synthesized materials were characterized by scanning electron microscope (SEM), atomic force microscopy (AFM), infrared (IR) and Ultraviolet–visible (UV–vis) spectroscopy. The powder and thin-film samples of the synthesized materials, deposited by vacuum thermal evaporation, show the same intra-molecular bonds as in the IR spectroscopy studies, which suggests that the thermal evaporation process does not alter these bonds. The effect of temperature on conductivity and electrical conduction mechanism was measured in the thin films (∼137 nm thickness). They showed a semiconductor-like behaviour with an optical activation energy arising from indirect transitions of 2.15, 2.13 and 3.6 eV for the C 46H 22N 8O 4KFe, C 46H 22N 8O 4KPb and C 46H 22N 8O 4KCo thin films.