Article

Characterization of Fluorene - Thiophene Copolymer Layers by the Surface Photovoltage Method

  1. Jiří Toušek1,*,
  2. Petra Pavlačková2,
  3. Věra Cimrová2,
  4. Jana Toušková1

Article first published online: 21 JUL 2008

DOI: 10.1002/masy.200850820

Issue

Macromolecular Symposia

Macromolecular Symposia

Special Issue: Advanced Polymer Materials for Photonics and Electronics

Volume 268, Issue 1, pages 96–99, July 2008

Additional Information

How to Cite

Toušek, J., Pavlačková, P., Cimrová, V. and Toušková, J. (2008), Characterization of Fluorene - Thiophene Copolymer Layers by the Surface Photovoltage Method. Macromol. Symp., 268: 96–99. doi: 10.1002/masy.200850820

Author Information

  1. 1

    Department of Macromolecular Physics, Faculty of Mathematics and Physics, Charles University, V Holešovičkách 2, 180 00 Prague 8, Czech Republic

  2. 2

    Institute of Macromolecular Chemistry, Academy of Sciences of the Czech Republic, Heyrovsky Sq. 2, 162 06 Prague 6, Czech Republic.

*Department of Macromolecular Physics, Faculty of Mathematics and Physics, Charles University, V Holešovičkách 2, 180 00 Prague 8, Czech Republic

Publication History

  1. Issue published online: 21 JUL 2008
  2. Article first published online: 21 JUL 2008

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Keywords:

  • conjugated polymers;
  • diffusion length;
  • fluorene-thiophene;
  • surface photovoltage;
  • thin films

Abstract

Summary: The surface photovoltage method was used for the study of thin polymer layers made of poly{(9,9-dihexylfluorene-2,7-diyl)[-3-(3-methylbutyl)thiophene-2,5-diyl]} prepared by spin-coating on ITO coated glass substrates. The surface photovoltage (SPV) in a thin polymer layer is a result of dissociation of photogenerated free excitons in electric field of the space charge region (SCR) which forms spontaneously at the surface. The photovoltage signal was formed between a transparent electrode capacitively coupled to the surface of the sample and the back ITO electrode. Photovoltaic spectra were measured under illumination both the free surface (SPVfs) and the substrate (SPVITO) side and for various layer thicknesses. The shape of the SPVITO spectrum is very similar to that of the absorption spectrum, whereas the SPVfs spectrum maximum is shifted to longer wavelengths. Fitting theory to the experimental data, the thickness of the space charge region and the diffusion lengths were evaluated. The results are discussed also in relation to photoluminescence study of thin films.

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