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Organic Photonics and Photovoltaics

Editor-in-Chief: Facchetti, Antonio

Ed. by Ponomarenko, Sergei

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Photoconductivity of Low-Bandgap Polymer and Polymer: Fullerene Bulk Heterojunction Studied by Constant Photocurrent Method

V. V. Malov
  • Corresponding author
  • A.N. Frumkin Institute of Physical Chemistry and Electrochemistry of the Russian Academy of Sciences, Leninsky prosp. 31, Moscow 119071, Russia
/ A. R. Tameev
  • Corresponding author
  • A.N. Frumkin Institute of Physical Chemistry and Electrochemistry of the Russian Academy of Sciences, Leninsky prosp. 31, Moscow 119071, Russia
/ S. V. Novikov
  • Corresponding author
  • A.N. Frumkin Institute of Physical Chemistry and Electrochemistry of the Russian Academy of Sciences, Leninsky prosp. 31, Moscow 119071, Russia
  • National Research University Higher School of Economics, Myasnitskaya Str. 20, Moscow 101000, Russia
/ M. V. Khenkin
  • Corresponding author
  • M.V. Lomonosov Moscow State University, Faculty of Physics, Leninskie Gory, Moscow 119991 Russia
/ A. G. Kazanskii
  • Corresponding author
  • M.V. Lomonosov Moscow State University, Faculty of Physics, Leninskie Gory, Moscow 119991 Russia
/ A.V. Vannikov
  • Corresponding author
  • A.N. Frumkin Institute of Physical Chemistry and Electrochemistry of the Russian Academy of Sciences, Leninsky prosp. 31, Moscow 119071, Russia
Published Online: 2015-08-19 | DOI: https://doi.org/10.1515/oph-2015-0011

Abstract

Optical and photoelectric properties of modern photosensitive polymers are of great interest due to their prospects for photovoltaic applications. In particular, an investigation of absorption and photoconductivity edge of these materials could provide valuable information. For these purpose we applied the constant photocurrent method which has proved its efficiency for inorganic materials. PCDTBT and PTB7 polymers were used as objects for the study as well as their blends with a fullerene derivative PC71BM. The measurements by constant photocurrent method (CPM) show that formation of bulk heterojunction (BHJ) in the blends increases photoconductivity and results in a redshift of the photocurrent edge in the doped polymers compared with that in the neat polymers. Obtained from CPM data, spectral dependences of absorption coefficient were approximated using Gaussian distribution of density-of-states within HOMO (highest occupied molecular orbital) and LUMO (lowest unoccupied molecular orbital) bands. The approximation procedure allowed us to evaluate rather optical than electrical bandgaps for the studied materials. Moreover, spectra of polymer:PC71BM blends were fitted well by the sum of two Gaussian peaks which reveal both the transitions within the polymer and the transitions involving charge transfer states at the donor-acceptor interface in the BHJ.

Keywords: photoconductivity; constant photocurrent method; organic solar cell; density-of-states; PTB7; PCDTBT; bulk heterojunction

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About the article

Received: 2014-09-24

Accepted: 2015-04-02

Published Online: 2015-08-19



Citation Information: Organic Photonics and Photovoltaics, ISSN (Online) 2299-3177, DOI: https://doi.org/10.1515/oph-2015-0011. Export Citation

© 2015 V. V. Malov et al.. This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License. (CC BY-NC-ND 3.0)

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