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Highlights: [•] Nano-pentacene thin film was prepared via thermal evaporation. [•] Optical constants and optical dispersion parameters were calculated. [•] The complex dielectric constant and the band gap were determined. [•] The optical conductivity σopt , (VELF) and (SELF) functions were calculated. [•] Pentacene is a good candidate for the organic thin film transistor. [Copyright &y& Elsevier]

Abstract: The optical properties of 2(3),9(10),16(17),23(24)-tetrakis-{6-(-benzofuran-2-carboxylate)-hexylthio} phthalocyaninatozinc(II) {Zn[Pc(b-S(CH2)6OCOBz-furan)4], (ZnPcBzF) thin film prepared by spin coating method were investigated. The optical constants of the prepared film were determined using spectrophotometric measurements of the transmittance and reflectance at normal incidence in the spectral range 200–800nm. The analysis of the spectral behavior of the absorption coefficient in the intrinsic absorption region revealed two direct allowed optical band gap of 2.58 and 3.87eV. The dispersion of the refractive index was discussed in terms of the single oscillator using Sellmeier dispersion formula. The high frequency dielectric constant (ε ∞ ) and the lattice dielectric constant (ε L ) were estimated. From the optical constants analysis, the optical conductivity was also considered. Discussion of the obtained results and their comparison with the previous published data were also given. The obtained results of this new zinc phthalocyanine benzofuran derivative (ZnPcBzF) support the desirable feature for the microelectronic and optoelectronic devices. [Copyright &y& Elsevier]