Influence of Heat Treatment on Surface, Structural and Optical Properties of Nickel and Copper Phthalocyanines Thin Films

Abstract

The work presents the effect of annealing on the change of polycrystalline α and β phases of copper and nickel phthalocyanines. We have found that this process has a great influence on the optical properties of the vapor-deposited layers. The performed measurements showed that for various forms of MPc, the values of the refractive index and the extinction coefficient increased, and consequently, so did the absorption coefficient. The AFM images taken showed that the values before and after heating are morphologically different. Raman measurements showed that the band at about 1526 cm−1 (B1g symmetry) has higher intensity for the α form than for the β form. The intensity of this band is related to changing the form of phthalocyanine from α to β. Our measurements have shown that by changing the annealing temperature of the layers, we change their optical properties. As a consequence, we change their optoelectronic parameters, adjusting them to the requirements of new optoelectronic devices, such as solar cells, sensors, displays and OLEDs.

Analysis of the optical and electronic characteristics of Al/NiPc complex/p-Si diode

“…Especially, for B band, the α value greater than 10 4 cm −1 means the possibility for direct transition [52]. This result shows that the NiTsPc has a direct band gap [47,52,56]. In this case, Tauc law [47] is valid.…”

Morphological, optical and electrochemical properties of tin(II) 2,3-naphthalocyanine for organic electronic applications

“…As seen in figures 2(b), (c), the thermal energy due to annealing at 373 K and 473 K for 4 h leads to obvious changes in the morphology and smoothness of SnNC surface. The diffusion of thermal energy leads to the growth of crystalline structure and an increase in the mean crystallite size of SnNC thin film [41][42][43][44][45][46].…”

Advanced Optical Materials: From Materials to Applications

“…This Special Issue also introduces research related to the applications of OLED (Organic Light-Emitting Diode) technology, in addition to the nanobio field. Popielarski et al investigated the effect of annealing on the optical properties of nickel and copper phthalocyanine thin films [19]. Phthalocyanines are organic compounds with a wide range of potential applications in optoelectronic devices, such as solar cells, sensors, displays, and OLEDs.…”