Eur. Phys. J. Appl. Phys.
Volume 51, Number 3, September 2010
Focus on Flexible Organic Electronics
|Number of page(s)||5|
|Published online||02 September 2010|
Thienopyrazine-based low-bandgap polymers for flexible polymer solar cells
Dept. Functional Polymer Systems and Physical Research, TITK Research Institute, Breitscheidstr. 97, 07407 Rudolstadt, Germany
2 Ilmenau Technical University, Institute for Physics, Weimarer Str. 32, 98684 Ilmenau, Germany
3 TU Ilmenau, Center for Micro- and Nanotechnologies, Gustav-Kirchhoff-Str. 7, 98693 Ilmenau, Germany
4 TU Ilmenau, Institute of Solid State Electronics, PF 10 05 65, 98684 Ilmenau, Germany
5 Friedrich-Schiller-University of Jena, Institute for Organic Chemistry and Macromolecular Chemistry, Humboldt-Str. 10, 07743 Jena, Germany
6 Jenpolymer Materials Ltd. & Co. KG, Wildenbruchstr. 15, 07745 Jena, Germany
Corresponding author: email@example.com
Accepted: 7 June 2010
Published online: 2 September 2010
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-butanoic acid methyl ester) content in solar cell devices down to 1:2 w/w giving a better than for MDMO-PPV:-PCBM cells (PM-19:-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 -PCBM signals are shifted to lower field related to those of -PCBM and overlap more with the polaron signal of PM-19. The LESR g-factor components of -PCBM 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:-PCBM).
© EDP Sciences, 2010
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