Journal
THIN SOLID FILMS
Volume 515, Issue 4, Pages 2085-2090Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.tsf.2006.07.005
Keywords
polymers; PEDOT; ozone; surface composition; work function; photoelectron spectroscopy; XPS; UPS
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We describe a simple method to increase the work function of poly(3,4-ethylenedioxy-thiophene)-poly(perfluoroethylene sulfonic acid), PEDOT-PFESA, and poly(3,4-ethylenedioxy-thiophene)-poly(styrene sulfonic acid), PEDOT-PSS, by short exposure to ultraviolet light and ozone. The creation of carbonyl groups in the surface region forms a dipole layer shifting the vacuum level with a followed increase in work function. It has been shown that the work function of PEDOT-PFESA can be increased by as much as similar to 0.4 eV to the absolute value of 6.3 eV and by at least similar to 0.2 eV for PEDOT-PSS to the absolute value of 5.4 eV. The increase in work function has also proven to be time dependent with the largest increasing rate occurring for short exposure times. Upon ozone treatment, both PEDOT and PSS are oxidized whereas PFESA seems to be unaffected. (c) 2006 Published by Elsevier B.V.
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