Layers dependent properties of magnesium phthalocyanine thin films prepared by Langmuir Blodgett method

The present study reports the effect of layers on structural, electrical and optical properties of Langmuir Blodgett (LB) films of Magnesium Phthalocyanine (MgPc). The stability of obtained monolayers of MgPc at air water interface is indicated by “Surface pressure-area per molecule isotherm”. The isotherm highlights the significance of compression, surface area, surface tension and surface pressure in modifying the film properties. The LB films of MgPc are characterized by X-Ray diffraction (XRD), UV-Vis Spectroscopy and current-voltage (I-V) characteristics in vacuum conditions. The results reveal increase in electrical conductivity with increase in number of layers. This is also indicated from appearance of red shifts with increase in number of layers of MgPc thin films in UV-Vis spectra. The crystallinity of 4th layer is found to be maximum with slight suppression in crystallinity of 6th layer film. This is attributed to layer stacking and creation of defect states on account of repulsion between the layers. This is also confirmed from the splitting of soret band in 6th layer of MgPc film in UV-Vis Spectra. The structural, optical and electrical results of MgPc films prepared through LB method have been found to be consistent with each other.The present study reports the effect of layers on structural, electrical and optical properties of Langmuir Blodgett (LB) films of Magnesium Phthalocyanine (MgPc). The stability of obtained monolayers of MgPc at air water interface is indicated by “Surface pressure-area per molecule isotherm”. The isotherm highlights the significance of compression, surface area, surface tension and surface pressure in modifying the film properties. The LB films of MgPc are characterized by X-Ray diffraction (XRD), UV-Vis Spectroscopy and current-voltage (I-V) characteristics in vacuum conditions. The results reveal increase in electrical conductivity with increase in number of layers. This is also indicated from appearance of red shifts with increase in number of layers of MgPc thin films in UV-Vis spectra. The crystallinity of 4th layer is found to be maximum with slight suppression in crystallinity of 6th layer film. This is attributed to layer stacking and creation of defect states on account of repulsion between the ...