Probing the role of dopants on structural and electrical properties through Raman and Impedance spectroscopy in Poly (3-methylthiophene) devices

Usha, SK and Shanbogh, SM and Mandal, S and Varade, A and Anjaneyulu, P (2024) Probing the role of dopants on structural and electrical properties through Raman and Impedance spectroscopy in Poly (3-methylthiophene) devices. In: Synthetic Metals, 307 .

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Abstract

The dopants in the polymer play an important role in modulating the electrical conduction as well as structural and morphological properties. Probing and correlating these aspects through various experimental tools is an important study in polymer device physics. Here, an attempt is made to correlate the structural and electrical properties of poly (3-methylthiophene) (P3MT) based devices with three different dopants using current-voltage (I-V), Impedance and Raman spectroscopy measurements. Three P3MT thin films with different dopant ions, namely Hexafluorophosphate (PF6�),Tetrafluoroborate ( BF4�) and Perchlorate ( ClO4�) are grown onto stainless steel substrates by electrochemical method. The peaks in the Raman data indicate quinoid and aromatic like structures in all P3MT thin films. I-V and impedance measurements show that the device P3MT with LiClO4 exhibits dominant bulk conduction, whereas the other two devices, P3MT with TBAPF6 and P3MT with TBABF4 show the interface-related conduction. The Cole- Cole plots and Impedance data are analyzed using equivalent circuit model by simulation, consisting of two parallel RQ circuits in series. From the simulated data, a few device parameters are extracted. The Raman, I-V and impedance results are correlated to present a broad overview to understand the device physics. © 2024 Elsevier B.V.

Item Type:	Journal Article
Publication:	Synthetic Metals
Publisher:	Elsevier Ltd
Additional Information:	The copyright for this article belongs to Elsevier Ltd.
Keywords:	Chlorine compounds; Electric network analysis; Equivalent circuits; Inorganic compounds; Lithium compounds; Structural properties; Thin films, Device physics; Electrical conduction; Electrochemical synthesis; Impedance spectroscopy; Poly (3-methylthiophene); Poly-3-methylthiophene; Polymer devices; Structural and electrical properties; Structural and morphological properties; Thin-films, Conjugated polymers
Department/Centre:	Division of Physical & Mathematical Sciences > Physics
Date Deposited:	06 Aug 2024 10:29
Last Modified:	06 Aug 2024 10:29
URI:	http://eprints.iisc.ac.in/id/eprint/85241

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