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Sensitizer Effects on the Transport Properties of Polymer:Sensitizer Organic Blend

Published online by Cambridge University Press:  21 March 2013

Karina Aleman ,
Svetlana Mansurova ,
Andrey Kosarev ,
Ponciano Rodriguez ,
Klaus Meerholz  and
Sebastian Koeber
Karina Aleman
Affiliation:
National Institute for Astrophysics, Optics and Electronics, AP 51 y 216, Puebla, 72000, Mexico
Svetlana Mansurova
Affiliation:
National Institute for Astrophysics, Optics and Electronics, AP 51 y 216, Puebla, 72000, Mexico
Andrey Kosarev
Affiliation:
National Institute for Astrophysics, Optics and Electronics, AP 51 y 216, Puebla, 72000, Mexico
Ponciano Rodriguez
Affiliation:
National Institute for Astrophysics, Optics and Electronics, AP 51 y 216, Puebla, 72000, Mexico
Klaus Meerholz
Affiliation:
University of Cologne, Insitute of Physical Chemistry, Luxemburger Str. 116, Cologne, D-50939, Germany
Sebastian Koeber
Affiliation:
University of Cologne, Insitute of Physical Chemistry, Luxemburger Str. 116, Cologne, D-50939, Germany
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Abstract

In this work we studied the effect of sensitizer concentration on a mobility-lifetime product μτ, on photoconductivity response time ph τph, and on drift mobility μ of the majority carriers in an organic polymer:sensitizer blend. The intensity modulated photocurrent and photo-EMF technique were used as experimental tools for this purpose. The studied material consists of a mixture of the novel non-conjugated main chain hole-transporting polymer PFO6:PDA (Poly(N,N'-bis(4-hexyloxyphenyl)-N'-(4-(9-phenyl-9H-fluoren-9-yl)phenyl)phenylen-1,4- diamine) sensitized with the highly soluble C60 derivative PCBM (phenyl-C61-butyric acid methyl ester) in the range from Z = 1 to 40 wt.-%. It was experimentally observed that (1) at the increasing sensitizer concentration the overall photoconductivity increases; (2) the majority carrier type switches from holes to electrons at approximately 2:1 polymer:sensitizer ratio; (3) the holes response time becomes shorter at the decreasing polymer fraction, while the electrons lifetime is only slightly dependent on sensitizer concentration; (4) the hole mobility-lifetime product decreases at the decreasing concentration of hole transporting component (polymer), while the electrons mobility-lifetime product increases at the increasing concentration of the electron transporting component (sensitizer); (5) the same is true for the carriers mobilities.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1270: Symposia GG/HH/II – Organic Photovoltaics and Related Electronics-From Excitons to Devices , 2010 , 1270-II09-19
Copyright
Copyright © Materials Research Society 2010

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References

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