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Improved Performance of Polymer:Polymer Solar Cells by Doping Electron-Accepting Polymers with an Organosulfonic Acid

  1. Sungho Nam1,
  2. Minjung Shin1,4,
  3. Hwajeong Kim1,*,
  4. Chang-Sik Ha2,
  5. Moonhor Ree3,
  6. Youngkyoo Kim1,*

Article first published online: 22 SEP 2011

DOI: 10.1002/adfm.201101215

Issue

Advanced Functional Materials

Advanced Functional Materials

Volume 21, Issue 23, pages 4527–4534, December 6, 2011

Additional Information

How to Cite

Nam, S., Shin, M., Kim, H., Ha, C.-S., Ree, M. and Kim, Y. (2011), Improved Performance of Polymer:Polymer Solar Cells by Doping Electron-Accepting Polymers with an Organosulfonic Acid. Adv. Funct. Mater., 21: 4527–4534. doi: 10.1002/adfm.201101215

Author Information

  1. 1

    Organic Nanoelectronics Laboratory, Department of Chemical Engineering, Kyungpook National University, Daegu 702-701, S. Korea

  2. 2

    Department of Polymer Science and Engineering, Pusan National University, Busan 609-735, S. Korea

  3. 3

    Division of Advanced Materials Science, Department of Chemistry, Center for Electro-Photo Behaviors in Advanced Molecular Systems, BK School of Molecular Science, and Polymer Research Institute, Pohang University of Science and Technology (POSTECH), Pohang 790-784, S. Korea

  4. 4

    Solar Cell Business Team, LG Innotek, Gyeonggi-do 447-705, S. Korea

*Organic Nanoelectronics Laboratory, Department of Chemical Engineering, Kyungpook National University, Daegu 702-701, S. Korea.

Publication History

  1. Issue published online: 30 NOV 2011
  2. Article first published online: 22 SEP 2011
  3. Manuscript Revised: 21 JUL 2011
  4. Manuscript Received: 27 MAY 2011

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Keywords:

  • Polymer Solar Cells;
  • Electron-Accepting Polymers;
  • Organosulfonic Acids;
  • Doping;
  • Electron Mobility

Abstract

The performance of polymer:polymer solar cells that are made using blend films of poly(3-hexylthiophene) (P3HT) and poly(9,9-dioctylfluorene-co- benzothiadiazole (F8BT) is improved by doping the F8BT polymer with an organosulfonic acid [4-ethylbezenesulfonic acid (EBSA)]. The EBSA doping of F8BT, to form F8BT-EBSA, is performed by means of a two-stage reaction at room temperature and 60°C with various EBSA weight ratios. The X-ray photoelectron spectroscopy measurement reveals that both sulfur and nitrogen atoms in the F8BT polymer are affected by the EBSA doping. The F8BT-EBSA films exhibit huge photoluminescence quenching, ionization potential shift toward lower energy, and greatly enhanced electron mobility. The short-circuit current density of solar cells is improved by ca. twofold (10 wt.% EBSA doping), while the open-circuit voltage increases by ca. 0.4 V. Consequently, the power conversion efficiency was improved by ca. threefold, even though the optical density of the P3HT:F8BT-EBSA blend film is reduced by 10 wt.% EBSA doping due to the nanostructure and surface morphology change.

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