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Polymers 2018, 10(4), 454; https://doi.org/10.3390/polym10040454

Thermal Dependence of Optical Parameters of Thin Polythiophene Films Blended with PCBM

1
Materials Engineering, Mechanical Department, Cracow University of Technology, Jana Pawła II 37 str., 31-867 Cracow, Poland
2
Department of Electronics, AGH University of Science and Technology, Mickiewicza 30 Av., 30-059 Cracow, Poland
3
Institute of Physics, Cracow University of Technology, Warszawska 24 str., 30-841 Cracow, Poland
*
Author to whom correspondence should be addressed.
Received: 22 February 2018 / Revised: 4 April 2018 / Accepted: 17 April 2018 / Published: 19 April 2018
(This article belongs to the Special Issue Polymeric Materials for Optical Applications)
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Abstract

The main purpose of this work is to show the thermal dependence of the refractive and extinction indices of conjugated polymer films used in optoelectronics devices. Herein, we present the results of optical investigations performed for the following polymers: poly(3-hexylthiophene) (P3HT), poly(3-octylthiophene) (P3OT), and their blends with [6,6]-phenyl C61 butyric acid methyl ester (PCBM). For our analysis, we chose well-known polythiophenes such P3HT and P3OT, often used in photovoltaic cells. Our addition of PCMB to the polythiophenes allows their conversion efficiency to be increased. This paper presents the results of our investigation determining the spectral dispersion of optical constants in a wavelength range of 190–1700 nm by using spectroscopic ellipsometry (SE). Furthermore, we show the temperature dependence of the refractive indices of polythiophene films for a heating and a cooling process in the temperature range 25–130 °C. Additionally, thermo-optic coefficients and an optical gap were established and are presented in the paper, followed by a discussion on the conditions of the thermal stability of polythiophene blends and reversibility issues in thermal processes. Our paper presents a new and fresh analysis of depolarization beams after their reflection from the studied films. The paper presents the results of thermo-optical studies of polymer blends which have not been included in previously published works. View Full-Text
Keywords: conjugated thin films; polythiophene blends; spectroscopic ellipsometry; thermo-optical investigations conjugated thin films; polythiophene blends; spectroscopic ellipsometry; thermo-optical investigations
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Jaglarz, J.; Małek, A.; Sanetra, J. Thermal Dependence of Optical Parameters of Thin Polythiophene Films Blended with PCBM. Polymers 2018, 10, 454.

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