Investigation of Polyaniline Thin Film and Schottky Junction with Aluminium for Electrical and Optical Characterization

Pronob Jyoti Saikia,Pratap Chandra Sarmah

doi:10.4236/msa.2011.28138

Pronob Jyoti Saikia, Pratap Chandra Sarmah

Open Access

https://doi.org/10.4236/msa.2011.28138

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Abstract

Polyaniline Powdered sample was chemically synthesized using aniline and doped with HCl. Ultra thin film and Schottky junction with Al metal have been fabricated from this powdered sample Ultrathin film of polyaniline shows amorphous nature of the film. Two activation energies of these films at two different temperatures regions within 25-120oC have been observed. Schottky Junction with Al meal shows that the diode ideality factor is much higher than unity. Barrier height of this Schottky junction is estimated to be around 0.61eV. C-V plot of the junction indicates that the carrier concentration is about 1015cm-3. There are various factors found to affect the junction to deviate from ideal Schottky behaviour.

Highlights

Among all conducting polymers, polyaniline (PANI) and its derivatives have attracted much interest worldwide
Ultra thin film and Schottky junction with Al metal have been fabricated from this powdered sample Ultrathin film of polyaniline shows amorphous nature of the film
Schottky Junction with Al metal shows that the diode ideality factor is much higher than unity

Summary

Introduction

Polyaniline (PANI) and its derivatives have attracted much interest worldwide. Simple polymerization, high conductivity, polyaniline has been used in various application, like, optoelectronics, bio-sensors, gas sensors, microelectronics etc. Polyaniline may be doped by protonic acid and oxidative doping [12]. It has been reported that the conductivity of film cast from solution of polyaniline camphor sulphonate in m-cresol is of about 2 order of magnitude higher than that of polyaniline protonated with mineral acid and organic acid [13]. Different inorganic and organic acids of different concentration have been used in the synthesis of PANI and this protonated products of polyaniline differs in stability and conductivity [14]. Nanocomposite of PANI is an important candidate for device application in biosensor, gas sensors, optoelectronics etc. Nanocomposite of PANI is an important candidate for device application in biosensor, gas sensors, optoelectronics etc. [16,17,18,19]

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