Effect of sorbitol doping in PEDOT: PSS on the electrical performance of organic photovoltaic devices

Sungeun Park, Sung Ju Tark, Donghwan Kim

Research output: Contribution to journalArticle

29 Citations (Scopus)

Abstract

Organic photovoltaic cells have important advantages, such as low cost and mechanical flexibility. The conducting polymer poly(3,4 ethylenedioxy-thiophene) :poly(styrene sulfonate) (PEDOT:PSS) has been widely used as an interfacial layer or a polymer electrode in polymer electronic devices, such as photovoltaic devices and light-emitting diodes. In this report, we discuss the direct current (DC) conductivity of PEDOT:PSS films containing various weight ratios of sorbitol dopant. The work function is shown to steadily decrease with increasing dopant content. With different dopant contents, illuminated current-voltage photovoltaic characteristics were observed. Ultraviolet photoelectron spectroscopy (UPS) analysis revealed that the work function of the PEDOT:PSS was affected by its sorbitol content. The morphologies of the doped PEDOT:PSS films were characterized by atomic force microscopy (AFM). For the device fabrication, we made organic photovoltaic cells by a spin-coating process and Al deposition by thermal evaporation. The sorbitol dopant is able to improve the efficiency of the device.

Original languageEnglish
Pages (from-to)1299-1301
Number of pages3
JournalCurrent Applied Physics
Volume11
Issue number6
DOIs
Publication statusPublished - 2011 Nov 1

    Fingerprint

Keywords

  • Organic solar cells
  • PEDOT:PSS
  • Sorbitol
  • UPS

ASJC Scopus subject areas

  • Materials Science(all)
  • Physics and Astronomy(all)

Cite this