Sharma, T. and Singhal, R. and Vishnoi, R. and Lakshmi, G. B. V. S. and Chand, S. (2017) Ion irradiation induced modifications of P3HT: A donor material for organic photovoltaic devices. Vacuum, 135. pp. 73-85. ISSN 0042-207X

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Abstract

The modifications of Poly(3-Hexylthiophene) (P3HT) thin films have been investigated by irradiating with 90 MeV Ni7+ ions at different fluences (1 x 10(9) to 1 x 10(11) ions/cm(2)). Thin films have been characterized by micro-Raman Spectroscopy, Fourier Transform Infrared Spectroscopy (FTIR), X-ray Diffraction (XRD), X-ray Photoelectron Spectroscopy (XPS), UV-visible absorption Spectroscopy, Photoluminescence spectroscopy (PL), Atomic Force Microscopy (AFM) and small angle X-ray scattering (SAXS) analysis. The narrow FWHM of C=C mode and the larger intensity ratio of C-C and C=C modes are identified at low fluences. The IR active modes with increased intensity indicates the increased conjugation length, while the XRD analysis revels the improved crystallinity with enhanced molecular ordering. The XPS analysis shows that chemical bonding nature near the film surface is not affected by irradiation. The room temperature electrical conductivity is found to be increased from 2.48 x 10(-6) to 1.35 x 10(-5) Omega(-1)cm(-1) at the fluence of 1 x 10(10) ions/cm(2.) The temperature dependence of dc conductivity has been explained using Mott's variable range hopping model. SAXS detector images confirm the presence of ion tracks and density variation between the track core and halo regions. It is found that less intense heating effect in the halo region of ion path could induce the molecular ordering of P3HT.

Item Type:	Article
Additional Information:	Copyright for this article belongs to M/s Elsevier.
Subjects:	Materials Science Applied Physics/Condensed Matter
Divisions:	UNSPECIFIED
Depositing User:	Users 27 not found.
Date Deposited:	21 May 2020 11:29
Last Modified:	21 May 2020 11:29
URI:	http://npl.csircentral.net/id/eprint/2946

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