Control of the Surface Composition of a Conducting‐Polymer Complex Film to Tune the Work Function

Abstract

Control of surface composition of a hole‐injecting conducting polymer complex, poly(3,4‐ethylenedioxy thiophene) (PEDOT) doped with a polystyrene sulfonate (PSS) has been conducted in the spin‐cast films. We found that the work function of the polymeric complex films formed via single spin‐coating can be greatly increased up to 5.44 eV by increasing the surface concentration of the PSS dopant. As a result, we improved the device efficiency and the lifetime of green emitting polymer light‐emitting diodes (PLEDs). This implies that the PSS surface layer of the films spin‐cast from the conducting polymer complexes plays a key role in making high performance PLEDs.

The Morphological Power of Soap: How Surfactants Lower the Sheet Resistance of PEDOT:PSS by Strong Impact on Inner Film Structure and Molecular Interface Orientation

“…Pure PEDOT:PSS is known to form a capping layer of PSS on top of the fi lm [ 17 ] which, however, is removed by the EG post-treatment. [ 16 ] Since our multilayer samples are EG posttreated before applying additional layers, the PSS layer is removed from the surface prior to the following coating cycle.…”

Construction of Redispersible Polypyrrole Core–Shell Nanoparticles for Application in Polymer Electronics

“…However, this statement requires further experimental and theoretical attention, and alternative explanations can be found in the recent literature. [25] We are currently investigating this in more detail and will report on the matter in due course.…”

Comparison of dimethyl sulfoxide treated highly conductive poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) electrodes for use in indium tin oxide-free organic electronic photovoltaic devices

“…This corresponds to decreases of 12% and 40% in the PSS component of the near-surface region for PEDOT:PSS ADD and PEDOT:PSS IMM electrodes respectively. The information depth was estimated to be $8 nm, given the inelastic mean free path of 27 Å for S 2p electrons through the material, and the 90 degree take-off angle (with respect to the surface plane) employed in this work [33]. This complements the UV-Vis spectra (inset Fig.…”