New quinoxaline and pyridopyrazine-based polymers for solution-processable photovoltaics
Journal article, 2012
The recently published quinoxaline/thiophene-based polymer TQ1 has been modified on its acceptor unit, either altering the acceptor strength by incorporating a pyridopyrazine, substitution of the acceptor-hydrogens by fluorine, or substitution of the alkoxy side chain by alkyl. The changes in physical, electronic and device properties are discussed. For the polymers incorporating the stronger acceptors a decreased performance is found, where in both cases the current in the devices is compromised. Incorporation of the pyridopyrazine-based acceptor seems to result in more severe or additional loss mechanisms compared to the polymer that incorporates the fluorine atoms. A similar performing material is obtained when changing the alkoxy side chain in TQ1 to an alkyl, where the solar cell performance is mainly improved on the fill factor. It is demonstrated that the standard TQ1 structure is easily modified in a number of ways, showing the versatility and robustness of the standard TQ1 structure and synthesis.
performance
Conjugated polymers
Organic electronics
bandgap polymers
charge-transfer states
photogeneration
open-circuit
films
Photovoltaic devices
Solar cells
blends
voltage
Polymeric materials
molecular-weight
heterojunction solar-cells
fullerene
Author
Renee Kroon
Chalmers, Chemical and Biological Engineering, Polymer Technology
R. Gehlhaar
Interuniversity Micro-Electronics Center at Leuven
Timothy Steckler
Chalmers, Chemical and Biological Engineering, Polymer Technology
Patrik Henriksson
Chalmers, Chemical and Biological Engineering, Polymer Technology
Christian Müller
Chalmers, Chemical and Biological Engineering, Polymer Technology
J. Bergqvist
Linköping University
A. Hadipour
Interuniversity Micro-Electronics Center at Leuven
P. Heremans
Interuniversity Micro-Electronics Center at Leuven
Mats Andersson
Chalmers, Chemical and Biological Engineering, Polymer Technology
Solar Energy Materials and Solar Cells
0927-0248 (ISSN)
Vol. 105 280-286Subject Categories
Chemical Sciences
DOI
10.1016/j.solmat.2012.06.029