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Dielectric Function of Undoped and Doped Poly2-methoxy-5-(3 `,7 `-dimethyloctyloxy)-1,4-phenylene-vinylene] by Ellipsometry in a Wide Spectral Range

Gasiorowski, Jacek and Hingerl, Kurt and Menon, Reghu and Plach, Thomas and Neugebauer, Helmut and Wiesauer, Karin and Yumusak, Cigdem and Sariciftci, Niyazi S (2013) Dielectric Function of Undoped and Doped Poly2-methoxy-5-(3 `,7 `-dimethyloctyloxy)-1,4-phenylene-vinylene] by Ellipsometry in a Wide Spectral Range. In: JOURNAL OF PHYSICAL CHEMISTRY C, 117 (42). pp. 22010-22016.

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Official URL: http://dx.doi.org/10.1021/jp4061957


Ellipsometric measurements in a wide spectral range (from 0.05 to 6.5 eV) have been carried out on the organic semiconducting polymer, poly2-methoxy-5-(3',7'-dimethyloctyloxy)-1,4-phenylene-vinylene] (MDMO-PPV), in both undoped and doped states. The real and imaginary parts of the dielectric function and the refractive index are determined accurately, provided that the layer thickness is measured independently. After doping, the optical properties show the presence of new peaks, which could be well-resolved by spectroscopic ellipsometry. Also for the doped material, the complex refractive index, with respect to the dielectric function, has been determined. The broadening of the optical transitions is due to the delocalization of polarons at higher doping level. The detailed information about the dielectric function as well as refractive index function obtained by spectroscopic ellipsometry allows not only qualitative but also quantitative description of the optical properties of the undoped/doped polymer. For the direct characterization of the optical properties of MDMO-PPV, ellipsometry turns out to be advantageous compared to conventional reflection and transmission measurements.

Item Type: Journal Article
Additional Information: copyright for this article belongs to American Chemical Society,
Department/Centre: Division of Physical & Mathematical Sciences > Physics
Date Deposited: 09 Jan 2014 08:28
Last Modified: 09 Jan 2014 08:32
URI: http://eprints.iisc.ac.in/id/eprint/47972

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