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

• Authors: V. V. Malov , A. R. Tameev , S. V. Novikov , M. V. Khenkin , A. G. Kazanskii , A.V. Vannikov
• Languages of publication: EN

Abstracts

EN

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

EN

photoconductivity; constant photocurrentmethod; organic solar cell; density-of-states; PTB7; PCDTBT; bulk heterojunction

• Publisher: De Gruyter Open
• Journal: Organic Photonics and Photovoltaics
• Year: 2015
• Volume: 3
• Issue: 1

Dates

online

19 - 8 - 2015

accepted

2 - 4 - 2015

received

24 - 9 - 2014

Contributors

author

V. V. Malov

• A.N. Frumkin Institute of Physical
  Chemistry and Electrochemistry of the Russian Academy of Sciences,
  Leninsky prosp. 31, Moscow 119071, Russia

author

A. R. Tameev

• A.N. Frumkin Institute of Physical
  Chemistry and Electrochemistry of the Russian Academy of Sciences,
  Leninsky prosp. 31, Moscow 119071, Russia

author

S. V. Novikov

• 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

author

M. V. Khenkin

• M.V. Lomonosov Moscow State
  University, Faculty of Physics, Leninskie Gory, Moscow 119991 Russia

author

A. G. Kazanskii

• M.V. Lomonosov Moscow State
  University, Faculty of Physics, Leninskie Gory, Moscow 119991 Russia

author

A.V. Vannikov

• A.N. Frumkin Institute of Physical
  Chemistry and Electrochemistry of the Russian Academy of Sciences,
  Leninsky prosp. 31, Moscow 119071, Russia

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Identifiers

DOI

10.1515/oph-2015-0011