Buffer and anode-integrated WO3-doped In2O 3 electrodes for PEDOT:PSS-free organic photovoltaics

Jun Ho Kim, Sin Bi Kang, Ju Hyun Lee, Yong Hee Shin, Hyun Su Shin, Dae Gyeon Kwon, Tae Yeon Seong, Yongsup Park, Seok In Na, Han Ki Kim

Research output: Contribution to journalArticlepeer-review

21 Citations (Scopus)


We developed PEDOT:PSS-free organic solar cells (OSCs) using WO3 and In2O3 (IWO) mixed electrodes acting as a buffer hole injection layer (HIL) and anode simultaneously. Through the co-sputtering and rapid thermal annealing (RTA) of WO3 and In2O3, we achieved buffer and anode-integrated transparent electrodes with a sheet resistance of 17 Ohm/square, a transmittance of 90.32%, and a work function of 4.83 eV, all of which are comparable to values obtained with a conventional ITO anode. Due to the existence of WO3 in the In2O3 matrix, OSCs fabricated on an IWO electrode with no acidic PEDOT:PSS buffer layer showed a PCE of 2.87%. Therefore, a transparent IWO electrode simultaneously acting as an HIL and anode layer can be considered a promising transparent electrode for cost-efficient and reliable OSCs because it could eliminate the use of acidic PEDOT:PSS buffer layer.

Original languageEnglish
Pages (from-to)1305-1312
Number of pages8
JournalOrganic Electronics
Issue number5
Publication statusPublished - 2013 May


  • Organic solar cells
  • PEDOT:PSS free
  • Transparent electrodes

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Biomaterials
  • Chemistry(all)
  • Condensed Matter Physics
  • Materials Chemistry
  • Electrical and Electronic Engineering


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