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International Journal of Photoenergy
Volume 2013 (2013), Article ID 843410, 6 pages
http://dx.doi.org/10.1155/2013/843410
Research Article

The Effects of Dilute Sulfuric Acid on Sheet Resistance and Transmittance in Poly(3,4-thylenedioxythiophene): Poly(styrenesulfonate) Films

1Department of Electronic Engineering, National Formosa University, Hu-Wei, Yunlin 63201, Taiwan
2Department of Electronic Engineering, Fortune Institute of Technology, Kaohsiung 83160, Taiwan
3Department of Aviation & Communication Electronics, Air Force Institute of Technology, Kaohsiung 82044, Taiwan
4Department of Electnical Engineering, National University of Kaohsiung, Kaohsiung 81148, Taiwan
5Department of Applied Physics, National University of Kaohsiung, Kaohsiung 81148, Taiwan

Received 15 September 2013; Accepted 3 October 2013

Academic Editor: Liang-Wen Ji

Copyright © 2013 Teen-Hang Meen et al. 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.

Abstract

The conductivity of poly(3,4-thylenedioxythiophene): poly(styrenesulfonate) (PEDOT: PSS) films by adding various molar concentrations of sulfuric acid (H2SO4) was improved and studied in this paper. The sheet resistance of the doped PEDOT: PSS film was enhanced with increasing the ratio of H2SO4, but it drops after the maximum sheet resistance. The reason for this phenomenon is resulting from the fact that the H2SO4 preferentially react with the sorbitol which is so-called the pinacol rearrangement. The nonconductive anions of some PSS were substituted by the conductive anions of hydrogen sulfate (HS ) when the residual H2SO4 reacted with PSS. In addition to the substitution reaction, PEDOT chains were increasingly aggregated with increasing the ratio of H2SO4. After doped H2SO4, the sheet resistance of H2SO4-doped PEDOT: PSS film is improved nearly 36%; the surface roughness is reduced from 1.268 nm to 0.822 nm and the transmittance is up to 91.9% in the visible wavelength range from 400 to 700 nm.