Jump to main content
Jump to site search

Issue 38, 2016
Previous Article Next Article

n-Doping of organic semiconductors for enhanced electron extraction from solution processed solar cells using alkali metals

Author affiliations

Abstract

To improve charge carrier injection into or extraction from organic optoelectronic devices, electrically doped layers are often employed. Whereas n-doping of organic semiconductors has been widely used in vacuum processed optoelectronic devices, adequate solution processes to enable future device printing are underdeveloped. In this work, we study n-doping of 1,3,5-tris(1-phenyl-1H-benzimidazol-2-yl)benzene (TPBi) in a solution process, using sodium as the electron donor. Upon addition of elementary sodium to a clear TPBi/toluene solution, we observed a change in color, indicating charge carrier transfer between sodium and TPBi. The optical and electrical properties of doped and undoped TPBi were characterized in solution and in the corresponding thin-films. Electron Paramagnetic Resonance (EPR) measurements revealed an increase of the number of unpaired spins upon doping, indicating the presence of doping-induced charge carriers. Implementing TPBi : Na as electron extraction layers in organic solar cells, we found almost the same device performance as compared to state-of-the-art solar cells comprising zinc oxide electron extraction layers.

Graphical abstract: n-Doping of organic semiconductors for enhanced electron extraction from solution processed solar cells using alkali metals

Back to tab navigation

Publication details

The article was received on 07 Jun 2016, accepted on 24 Aug 2016 and first published on 13 Sep 2016


Article type: Paper
DOI: 10.1039/C6TA04770J
Citation: J. Mater. Chem. A, 2016,4, 14703-14708
  • Open access: Creative Commons BY license
  •   Request permissions

    n-Doping of organic semiconductors for enhanced electron extraction from solution processed solar cells using alkali metals

    T. Schneider, J. Czolk, D. Landerer, S. Gärtner, A. Puetz, M. Bruns, J. Behrends and A. Colsmann, J. Mater. Chem. A, 2016, 4, 14703
    DOI: 10.1039/C6TA04770J

    This article is licensed under a Creative Commons Attribution 3.0 Unported Licence. Material from this article can be used in other publications provided that the correct acknowledgement is given with the reproduced material.

    Reproduced material should be attributed as follows:

    • For reproduction of material from NJC:
      [Original citation] - Published by The Royal Society of Chemistry (RSC) on behalf of the Centre National de la Recherche Scientifique (CNRS) and the RSC.
    • For reproduction of material from PCCP:
      [Original citation] - Published by the PCCP Owner Societies.
    • For reproduction of material from PPS:
      [Original citation] - Published by The Royal Society of Chemistry (RSC) on behalf of the European Society for Photobiology, the European Photochemistry Association, and RSC.
    • For reproduction of material from all other RSC journals:
      [Original citation] - Published by The Royal Society of Chemistry.

    Information about reproducing material from RSC articles with different licences is available on our Permission Requests page.

Search articles by author

Spotlight

Advertisements