All-Solution-Processed Metal-Oxide-Free Flexible Organic Solar Cells with Over 10% Efficiency

Wei Song, Xi Fan, Bingang Xu, Feng Yan, Huiqin Cui, Qiang Wei, Ruixiang Peng, Ling Hong, Jiaming Huang, Ziyi Ge

Research output: Journal article publicationJournal articleAcademic researchpeer-review

167 Citations (Scopus)


All-solution-processing at low temperatures is important and desirable for making printed photovoltaic devices and also offers the possibility of a safe and cost-effective fabrication environment for the devices. Herein, an all-solution-processed flexible organic solar cell (OSC) using poly(3,4-ethylenedioxythiophene):poly-(styrenesulfonate) electrodes is reported. The all-solution-processed flexible devices yield the highest power conversion efficiency of 10.12% with high fill factor of over 70%, which is the highest value for metal-oxide-free flexible OSCs reported so far. The enhanced performance is attributed to the newly developed gentle acid treatment at room temperature that enables a high-performance PEDOT:PSS/plastic underlying substrate with a matched work function (≈4.91 eV), and the interface engineering that endows the devices with better interface contacts and improved hole mobility. Furthermore, the flexible devices exhibit an excellent mechanical flexibility, as indicated by a high retention (≈94%) of the initial efficiency after 1000 bending cycles. This work provides a simple route to fabricate high-performance all-solution-processed flexible OSCs, which is important for the development of printing, blading, and roll-to-roll technologies.

Original languageEnglish
Article number1800075
JournalAdvanced Materials
Issue number26
Publication statusPublished - 27 Jun 2018


  • all-solution-processing
  • flexible organic solar cells
  • ITO-free
  • low-temperature

ASJC Scopus subject areas

  • General Materials Science
  • Mechanics of Materials
  • Mechanical Engineering


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