Abstract
This research work is dedicated to studying the optical properties of nanocrystalline alpha-sexithiophene (α-6T) thin films under the influence of thermal annealing. Alpha-sexithiophene thin films were deposited using thermal evaporation technique. The thermal treatment showed a significant influence on the structural, morphological and optical properties of α-6T thin films. The thermal annealing process induced an improvement in the crystallinity of the fabricated α-6T films as observed in X-ray diffraction patterns and Scanning electron microscopy. Moreover, the optical properties of films were studied using spectrophotometric data of transmittance and reflectance. The estimated values of indirect energy gap were 2.00 eV and 1.96 eV at 298 KK and 423 KK, respectively. The nonlinear optical susceptibility χ(3) was calculated at different temperatures. Finally, aging effect on the optical properties is discussed. The results show that the indirect band gap does not change with the aging time, this reflects the stability of α-6T prepared films.
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