Applied Physics A

, Volume 79, Issue 1, pp 31–35

Low bandgap alternating polyfluorene copolymers in plastic photodiodes and solar cells

  • O. Inganäs
  • M. Svensson
  • F. Zhang
  • A. Gadisa
  • N.K. Persson
  • X. Wang
  • M.R. Andersson
Article

DOI: 10.1007/s00339-003-2498-5

Cite this article as:
Inganäs, O., Svensson, M., Zhang, F. et al. Appl. Phys. A (2004) 79: 31. doi:10.1007/s00339-003-2498-5

Abstract

We report a comparative study of plastic photodiodes using four different copolymers of fluorene, with a variation of alkyl side chain length and chemical structure. Photodiode materials are formed by blending the polymers with a fullerene derivative and spincoating the blend solution. A photovoltage of 1 V is obtained in devices, where the anode is a doped polymer and the cathode is LiF/Al. Monochromatic quantum efficiencies are better than 40% over most of the absorption range, and under solar light AM 1.5 simulation, we reach energy efficiencies beyond 2%. The high fill factors obtained in some of the devices indicate that these are of interest for more elaborate optimisation. Reasons for the benign electrical transport are discussed.

Copyright information

© Springer-Verlag 2004

Authors and Affiliations

  • O. Inganäs
    • 1
  • M. Svensson
    • 2
  • F. Zhang
    • 1
  • A. Gadisa
    • 1
  • N.K. Persson
    • 1
  • X. Wang
    • 1
  • M.R. Andersson
    • 2
  1. 1.Biomolecular and organic electronics, IFMLinköpings UniversitetLinköpingSweden
  2. 2.Materials and Surface ChemistryChalmers University of TechnologyGöteborgSweden