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: firstname.lastname@example.org
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
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.