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Title: Drying temperature effects on electrical and optical properties of poly[2-methoxy-5-(2’-ethyl-hexyloxy)-1,4-phenylene vinylene] (MEH-PPV) thin film

Abstract

Temperature effects on electrical and optical properties of a representative semiconducting polymer, poly[2-methoxy-5-(2’-ethyl-hexyloxy)-1,4-phenylene vinylene] (MEH-PPV), has recently attracted much attention. The MEH-PPV thin films were deposited at different drying temperature (anneal temperature) using spin-coating technique. The spin coating technique was used to produce uniform film onto large area. The MEH-PPV was dissolved in toluene solution to exhibits different optical and electrical properties. The absorption coefficient and bandgap was measured using UV-Visible-NIR (UV-VIS-NIR). The bandgap of MEH-PPV was effect by the thickness of thin films. For electrical properties, two-point probe was used to characterize the current-voltage measurement. The current-voltage measurement shows that the MEH-PPV thin films become more conductive at high temperature. This study will provide better performance and suitable for optoelectronic device especially OLEDs applications.

Authors:
; ; ;  [1]; ;  [2];  [1];  [3]
  1. NANO-ElecTronic Centre, Faculty of Electrical Engineering, Universiti Teknologi MARA (UiTM), 40450 Shah Alam, Selangor (Malaysia)
  2. Research Chair of Targeting and Treatment of Cancer Using Nanoparticles Department of Biochemistry, College of Science, King Saud University (KSU), 245 Riyadh 11454 (Saudi Arabia)
  3. (UiTM), Shah Alam, Selangor (Malaysia)
Publication Date:
OSTI Identifier:
22608599
Resource Type:
Journal Article
Resource Relation:
Journal Name: AIP Conference Proceedings; Journal Volume: 1733; Journal Issue: 1; Conference: IC-NET 2015: International conference on nano-electronic technology devices and materials 2015, Selangor (Malaysia), 27 Feb - 2 Mar 2015; Other Information: (c) 2016 Author(s); Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; ABSORPTION; DRYING; ELECTRIC POTENTIAL; ELECTRICAL PROPERTIES; LIGHT EMITTING DIODES; OPTICAL PROPERTIES; OPTOELECTRONIC DEVICES; POLYMERS; SPIN; SPIN-ON COATING; TEMPERATURE DEPENDENCE; THICKNESS; THIN FILMS; TOLUENE

Citation Formats

Azhar, N. E. A., E-mail: najwaezira@yahoo.com, Affendi, I. H. H., E-mail: irmahidayanti.halim@gmail.com, Shafura, A. K., E-mail: shafura@ymail.com, Shariffudin, S. S., E-mail: sobihana@gmail.com, Alrokayan, Salman A. H., E-mail: dr.salman@alrokayan.com, Khan, Haseeb A., E-mail: khan-haseeb@yahoo.com, Rusop, M., E-mail: rusop@salam.uitm.edu.my, and NANO-SciTech Centre, Institute of Science, Universiti Teknologi MARA. Drying temperature effects on electrical and optical properties of poly[2-methoxy-5-(2’-ethyl-hexyloxy)-1,4-phenylene vinylene] (MEH-PPV) thin film. United States: N. p., 2016. Web. doi:10.1063/1.4948861.
Azhar, N. E. A., E-mail: najwaezira@yahoo.com, Affendi, I. H. H., E-mail: irmahidayanti.halim@gmail.com, Shafura, A. K., E-mail: shafura@ymail.com, Shariffudin, S. S., E-mail: sobihana@gmail.com, Alrokayan, Salman A. H., E-mail: dr.salman@alrokayan.com, Khan, Haseeb A., E-mail: khan-haseeb@yahoo.com, Rusop, M., E-mail: rusop@salam.uitm.edu.my, & NANO-SciTech Centre, Institute of Science, Universiti Teknologi MARA. Drying temperature effects on electrical and optical properties of poly[2-methoxy-5-(2’-ethyl-hexyloxy)-1,4-phenylene vinylene] (MEH-PPV) thin film. United States. doi:10.1063/1.4948861.
Azhar, N. E. A., E-mail: najwaezira@yahoo.com, Affendi, I. H. H., E-mail: irmahidayanti.halim@gmail.com, Shafura, A. K., E-mail: shafura@ymail.com, Shariffudin, S. S., E-mail: sobihana@gmail.com, Alrokayan, Salman A. H., E-mail: dr.salman@alrokayan.com, Khan, Haseeb A., E-mail: khan-haseeb@yahoo.com, Rusop, M., E-mail: rusop@salam.uitm.edu.my, and NANO-SciTech Centre, Institute of Science, Universiti Teknologi MARA. 2016. "Drying temperature effects on electrical and optical properties of poly[2-methoxy-5-(2’-ethyl-hexyloxy)-1,4-phenylene vinylene] (MEH-PPV) thin film". United States. doi:10.1063/1.4948861.
@article{osti_22608599,
title = {Drying temperature effects on electrical and optical properties of poly[2-methoxy-5-(2’-ethyl-hexyloxy)-1,4-phenylene vinylene] (MEH-PPV) thin film},
author = {Azhar, N. E. A., E-mail: najwaezira@yahoo.com and Affendi, I. H. H., E-mail: irmahidayanti.halim@gmail.com and Shafura, A. K., E-mail: shafura@ymail.com and Shariffudin, S. S., E-mail: sobihana@gmail.com and Alrokayan, Salman A. H., E-mail: dr.salman@alrokayan.com and Khan, Haseeb A., E-mail: khan-haseeb@yahoo.com and Rusop, M., E-mail: rusop@salam.uitm.edu.my and NANO-SciTech Centre, Institute of Science, Universiti Teknologi MARA},
abstractNote = {Temperature effects on electrical and optical properties of a representative semiconducting polymer, poly[2-methoxy-5-(2’-ethyl-hexyloxy)-1,4-phenylene vinylene] (MEH-PPV), has recently attracted much attention. The MEH-PPV thin films were deposited at different drying temperature (anneal temperature) using spin-coating technique. The spin coating technique was used to produce uniform film onto large area. The MEH-PPV was dissolved in toluene solution to exhibits different optical and electrical properties. The absorption coefficient and bandgap was measured using UV-Visible-NIR (UV-VIS-NIR). The bandgap of MEH-PPV was effect by the thickness of thin films. For electrical properties, two-point probe was used to characterize the current-voltage measurement. The current-voltage measurement shows that the MEH-PPV thin films become more conductive at high temperature. This study will provide better performance and suitable for optoelectronic device especially OLEDs applications.},
doi = {10.1063/1.4948861},
journal = {AIP Conference Proceedings},
number = 1,
volume = 1733,
place = {United States},
year = 2016,
month = 7
}
  • In this paper we investigate the causes of the chromatic alteration observed in chloroform solutions of poly (2-methoxy-5-(2'-ethyl-hexyloxy)-1,4-phenylene vinylene) (MEH-PPV) after gamma ray irradiation. Structural and chemical changes were analyzed by gel permeation chromatography, fourier transform infrared spectroscopy, and proton nuclear magnetic resonance techniques and complemented by electronic structure calculations. The results indicate chlorine incorporation in the polymer structure and main chain scission after irradiation. Based on our findings we propose that the main mechanism for the blue-shifts, observed in the UV-Vis absorption spectra of MEH-PPV after irradiation, is the result of a radical attack on the polymer main chain.more » Gamma rays generate radicals, Cl and CHCl{sub 2} from chloroform radiolysis that attack preferentially the vinyl double bonds of the polymer backbone, breaking the electronic conjugation and eventually the chain. Our results indicate that oxygen does not play a major role in the effect. Electronic spectra simulations were performed based on these assumptions reproducing the UV-Vis experimental results.« less
  • We present a quantitative analysis of the absorption and field-induced absorption (electroabsorption) spectra of dilute blends of the conjugated polymer poly[2-methoxy,5-(2{prime}-ethyl-hexoxy)-{ital p}-phenylene vinylene] (MEH-PPV) oriented in ultrahigh-molecular-weight polyethylene (PE). Because of the orientation, the enhanced order and the dilution of the MEH-PPV conjugated polymer in the polyethylene matrix, the MEH-PPV/PE blend is an ideal system in which to investigate the intrinsic linear and nonlinear optical properties of oriented conjugated polymer chains; the absorption is directly proportional to the imaginary part of {chi}{sup (1)}({omega}) and the electroabsorption is directly proportional to the imaginary part of {chi}{sup (3)}({omega},0,0) of the oriented, orderedmore » MEH-PPV {pi}-electron system. The optical data obtained from the oriented blends are, therefore, directly relevant to theoretical models which describe the intrinsic electronic structure of the conjugated polymer, i.e., models which do not account for disorder. Using a model based on the continuum version of the Su-Schrieffer-Heeger theory, we simultaneously fit to the absorption and electroabsorption spectra, and demonstrate that the intrinsic optical line shape of MEH-PPV oriented in polyethylene is highly asymmetric, and can be modeled accurately in terms of a Gaussian-broadened one-dimensional square-root singularity in the joint density of states.« less
  • We present measurements of the optical absorption and emission properties of poly({ital p}-phenylene vinylene) (PPV) -related materials focusing on the differences between molecules isolated by dispersion in an inert host and concentrated molecular films. Optical absorption spectra, photoluminescence (PL) spectra, PL efficiency, and time-resolved PL spectra of dilute blends of PPV oligomers with 2{endash}5 phenylene-phenyl rings are compared with those of dense oligomer and polymer films. In dilute oligomer-poly(methyl methacrylate) (PMMA) blends with high PL efficiency, the PL decay is exponential, independent of both temperature and oligomer length. This implies that the fundamental radiative lifetime of PPV oligomers is essentiallymore » independent of oligomer length. Concentrated spin-cast oligomer films and polymers have a faster and strongly temperature-dependent PL decay that approaches that of the dilute oligomer results at low temperature. The differences in PL decay correspond to changes in PL efficiency. The efficiency of the oligomer-PMMA blend is high and only weakly temperature dependent, whereas that of concentrated films is lower and strongly temperature dependent, decreasing by more than a factor of 3 from 10 to 350 K. The quenching of the PL efficiency in concentrated films is due to migration to extrinsic, impurity related centers as opposed to an intrinsic intermolecular recombination process. The PL spectrum of a dilute oligomer blend redshifts substantially, both as the excitation energy is decreased and as the emission time increases. This spectral redshift is due to disorder-induced site-to-site variation and not to diffusion to lower-energy sites. In contrast, no spectral shift with excitation energy or emission time was observed for dense oligomer films. {copyright} {ital 1996 The American Physical Society.}« less
  • We have studied the interface formed on polyparaphenylene-vinylene (PPV) thin film by chromium layer deposited by thermal evaporation. Comparison of attenuated total reflection infra-red spectra obtained in pristine and covered PPV films shows that new absorption bands emerge at 687, 1026 and 1392 cm{sup {minus}1} upon chromium deposition. The Cr 3d valence distributions obtained by electron induced x-ray emission spectroscopy with covered sample is shifted towards higher binding energies with regards to metallic chromium. The features found in both experiments are interpreted as the characteristics of a compound in the chromium on polymer interface. {copyright} {ital 1996 American Institute ofmore » Physics.}« less
  • We discuss cooperative and stimulated emissions and separate their respective contributions to the emission spectral narrowing in thin films and solutions of poly(p-phenylene-vinylene) derivatives. Whereas cooperative radiation is favored in films with poor optical confinement, directional stimulated emission is dominant in dilute solutions and thin films with superior optical confinement. Spectral narrowing in the latter case could be achieved by increasing either the excitation length or excitation intensity, from which we determined the optical gain and loss coefficients at the 0-1 emission band assuming a simple amplified spontaneous emission model. We found that the threshold excitation intensity for stimulated emissionmore » in neat films is mainly determined by self-absorption and that the gain saturates at emission intensities of about 10{sup 7}W/cm{sup 2}. {copyright} {ital 1998} {ital The American Physical Society}« less