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

Authors

  • Tae-Woo Lee,

    Corresponding author
    1. Display Device and Processing Laboratory, Samsung Advanced Institute of Technology, Mt. 14-1, Nongseo-dong, Giheung-gu, Yongin-si, Gyeonggi-do, 446-712 (Korea)
    • Display Device and Processing Laboratory, Samsung Advanced Institute of Technology, Mt. 14-1, Nongseo-dong, Giheung-gu, Yongin-si, Gyeonggi-do, 446-712 (Korea).
    Search for more papers by this author
  • Youngsu Chung

    1. Analytical Engineering Center, Samsung Advanced Institute of Technology, Mt. 14-1, Nongseo-dong, Giheung-gu, Yongin-si, Gyeonggi-do, 446-712 (Korea)
    Search for more papers by this author

  • The authors thank Ms. Y. Kwon for helpful technical support of atomic force microscopy.

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.

Ancillary