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Thienopyrazine-based low-bandgap polymers for flexible polymer solar cells

Published online by Cambridge University Press:  02 September 2010

S. Sensfuss ,
L. Blankenburg ,
H. Schache ,
S. Shokhovets ,
T. Erb ,
A. Konkin ,
A. Herasimovich ,
S. Scheinert ,
M. Shahid  and
S. Sell
...Show all authors
S. Sensfuss*
Affiliation:
Dept. Functional Polymer Systems and Physical Research, TITK Research Institute, Breitscheidstr. 97, 07407 Rudolstadt, Germany
L. Blankenburg
Affiliation:
Dept. Functional Polymer Systems and Physical Research, TITK Research Institute, Breitscheidstr. 97, 07407 Rudolstadt, Germany
H. Schache
Affiliation:
Dept. Functional Polymer Systems and Physical Research, TITK Research Institute, Breitscheidstr. 97, 07407 Rudolstadt, Germany
S. Shokhovets
Affiliation:
Ilmenau Technical University, Institute for Physics, Weimarer Str. 32, 98684 Ilmenau, Germany
T. Erb
Affiliation:
Ilmenau Technical University, Institute for Physics, Weimarer Str. 32, 98684 Ilmenau, Germany
A. Konkin
Affiliation:
TU Ilmenau, Center for Micro- and Nanotechnologies, Gustav-Kirchhoff-Str. 7, 98693 Ilmenau, Germany
A. Herasimovich
Affiliation:
TU Ilmenau, Institute of Solid State Electronics, PF 10 05 65, 98684 Ilmenau, Germany
S. Scheinert
Affiliation:
TU Ilmenau, Institute of Solid State Electronics, PF 10 05 65, 98684 Ilmenau, Germany
M. Shahid
Affiliation:
Friedrich-Schiller-University of Jena, Institute for Organic Chemistry and Macromolecular Chemistry, Humboldt-Str. 10, 07743 Jena, Germany
S. Sell
Affiliation:
Jenpolymer Materials Ltd. & Co. KG, Wildenbruchstr. 15, 07745 Jena, Germany
E. Klemm
Affiliation:
Friedrich-Schiller-University of Jena, Institute for Organic Chemistry and Macromolecular Chemistry, Humboldt-Str. 10, 07743 Jena, Germany Jenpolymer Materials Ltd. & Co. KG, Wildenbruchstr. 15, 07745 Jena, Germany
*
sensfuss@titk.de
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Abstract

The optical gaps of the low-bandgap PPVs (PM-20, PM-19, PM-18) are decreased down to 1.6-1.7 eV compared with that of MDMO-PPV (2.2 eV). The best lateral hole mobility was determined to be 2.1 × 10-3 cm2/V s (PM-18) in field effect transistors and exceeds that of MDMO-PPV (poly-[ 2-methoxy-5-(3'.7'-dimethyloctyloxy)-1.4-phenylenevinylene], 8.5 × 10-4 cm2/V s). This allows to reduce the PCBM ([6.6]-phenyl-C$_{61(71)}$-butanoic acid methyl ester) content in solar cell devices down to 1:2 w/w giving a better $\eta_{\rm AM1.5}$ than for MDMO-PPV:[60]-PCBM cells (PM-19:[60]-PCBM 2.32% on ITO-PET, 2.86% on ITO glass). The charge transfer to PCBM as acceptor occurs quite normally and shows an effective charge separation using light-induced spin resonance spectroscopy (LESR). The [70]-PCBM$^{-\bullet}$ signals are shifted to lower field related to those of [60]-PCBM$^{-\bullet}$ and overlap more with the polaron signal of PM-19. The LESR g-factor components of [70]-PCBM$^{-\bullet}$ are reported for the first time. The external quantum efficiency peak values achieve up to 42% at ~350–400 nm and 26% at ~640 nm (PM-19:[60]-PCBM).

Type
Research Article
Information
The European Physical Journal - Applied Physics , Volume 51 , Issue 3: Focus on Flexible Organic Electronics , September 2010 , 33204
Copyright
© EDP Sciences, 2010

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