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 journalArticlepeer-review

30 Citations (Scopus)


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
Issue number6
Publication statusPublished - 2011 Nov

Bibliographical note

Funding Information:
This work was supported by the New & Renewable Energy of the Korea Institute of Energy Technology Evaluation and Planning(KETEP) grant funded by the Korea government Ministry of Knowledge Economy (No. 2008-N-PV12-P-09-0-000) .


  • Organic solar cells
  • Sorbitol
  • UPS

ASJC Scopus subject areas

  • General Materials Science
  • General Physics and Astronomy


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