Abstract
A comparative study on the nature of direct current electrical conduction in the monolayer and bilayer plasma polymerized thin films has been discussed in this article. The plasma polymerized pyrrole (PPPy) monolayer, plasma polymerized N,N,3,5-tetramethylaniline (PPTMA) monolayer and plasma polymerized pyrrole-N,N,3,5-tetramethylaniline (PPPy-PPTMA) bilayer thin films were deposited at room temperature onto glass substrates by using a parallel plate capacitively coupled glow discharge reactor. The current density-voltage (J-V) characteristics and the conductivity-voltage (σ-V) characteristics have been studied to analyze the direct current conduction mechanism in PPPy, PPTMA monolayer and PPPy-PPTMA bilayer thin films. The observed results have been presented in this paper. The J-V and σ-V characteristics of PPPy and PPTMA monolayer thin films of different thicknesses indicated an increase in electrical conduction and also an increase in conductivity in the films of lower thicknesses. It is also observed that PPTMA thin films are more conductive than that of PPPy thin films. As a result the PPPy-PPTMA bilayer thin films of different thicknesses and different deposition time ratios indicated an increase in conductivity as the proportion of PPTMA is increased in the films. In addition to that, from the J-V and σ-V characteristics of PPPy, PPTMA and PPPy-PPTMA thin films of same thickness, it is observed that the current conduction and the conductivity in the bilayer thin films is less compared to the monolayer thin films. This unusual result has been explained by studying ideal and real bilayer thin films. It is also seen that in the low voltage region, the current conduction obeys Ohm’s law while the charge transport phenomenon appears to be the space charge limited conduction (SCLC) in the higher voltage regions.
Highlights
Plasma polymerized thin films are kind of amorphous organic insulating materials, known as dielectrics, are essential for the proper operation and reliability of all electrical and electronic equipment
In the study of the dc electrical conduction in the polymer thin films, the current conduction is considered through the film, rather than along the plane of the film and the carriers may either be electronic or ionic in nature
The total deposition time was kept 60 min for all the samples, but the deposition time-ratios of PPPy-PPTMA bilayer (PPPy): PPTMA for the bilayer thin films were (35 min : 25 min), (30 min : 30 min) and (25 min : 35 min) which have produced the films of thicknesses 450 nm, 400 nm and 350 nm respectively
Summary
Plasma polymerized thin films are kind of amorphous organic insulating materials, known as dielectrics, are essential for the proper operation and reliability of all electrical and electronic equipment. In the study of the dc electrical conduction in the polymer thin films, the current conduction is considered through the film, rather than along the plane of the film and the carriers may either be electronic or ionic in nature. The influence of electrode material and film thickness on charge transport properties of electrodeposited polypyrrole (PPy) thin films were investigated by Valaski et al [1, 2]. They reported that the increase in the. The current density-voltage (J-V) characteristics and the DC conductivity-voltage (σ-V) characteristics of monolayer and bilayer thin films of different thicknesses with aluminium (Al) electrodes were investigated to study the DC conduction properties in the thin films. Bhuiyan / Journal of Thin Films Research 6(1) (2022) 55–59 d) plots have been shown to confirm the type of electrical conduction mechanism in the high voltage region
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