Mott variable range hopping transport in thermal evaporated vanadyl 2, 3 naphthalocyanine thin films

Thin films of Vanadyl 2, 11, 20, 29, Tetra Tert-Butyl 2,3 Naphthalocyanines [VTTBNc] are prepared by means of Vacuum evaporation technique. The effect of thickness and substrate heating on electrical, optical, structural and surface morphological characteristics of the thin films are studied by means of various characterization techniques like DC electrical conductivity, UV–visible absorption spectra, X-ray Diffractogram (XRD), scanning electron microscopy (SEM) and atomic force microscopy (AFM). Electrical conductivity studies of thin film samples show an exponential variation with a negative temperature coefficient of resistance. Transport property like density of states near Fermi level decreases and hopping distance increase with the increase in thickness and substrate temperature. [Display omitted] •Novel organic semiconducting Vanadyl Tetra Tert butyl2, 3 Naphthalocyanine [VTTBNc] thinfilm are prepared.•Morphological and structural studies respectively accounts for the defect free and stable thinfilm microstructure.•Electrical charge transport properties of VTTBNc thinfilms are analyzed using Mott variable range hopping mechanism.•Increase in thickness and substrate heating enhances the hopping conduction and a decrease in band gap energy.•Hence VTTBNc thinfilms are suitable micro molecular materials for thermo electric applications.