Determination of the Optical Properties of ppTh Nanostructured Films Obtained by RF Plasma Polymerisation Technique

Year 2019, Volume: 9 Issue: 1, 374 - 381, 01.03.2019

Özkan Bayram

https://doi.org/10.21597/jist.461102

Abstract

In
this study, it is aimed to obtain plasma polymerized Thiophene (ppTh) thin
films by Radio Frequency (RF) plasma polymerization technique and to determine
optical, chemical and morphological properties of these films. ppTh thin films
were fabricated at 25, 50, 75 and 100 W RF power, 15 minutes coating duration
and 500 mTorr base pressure. ppTh thin films
were analyzed by Scanning Electron Microscopy (SEM), FTIR and Uv-Vis
spectroscopy.
Functional groups of thin films were determined by
FTIR spectroscopy, and it was investigated how coating parameters affect the
chemical structure of these films. Optical properties such as absorbance, transmittance and optical band gap
were determined by Uv-Vis spectroscopy. The optical band gaps of the ppTh thin films were determined to be 2.97 eV, 3.13 eV,
3.17 eV and 3.68 eV with increasing RF power, respectively. In addition, all
thin films were highly transparent in the visible region (500 nm), and this
transparency tended to increase with increasing RF power. SEM analysis showed
that the thin films had nanosphere structure and the radius of these spheres
was about 90 nm.

Keywords

Thiophene, FTIR, RF, optical properties, organic semiconductors

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