New quinoxaline and pyridopyrazine-based polymers for solution-processable photovoltaics
Artikel i vetenskaplig tidskrift, 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

Författare

Renee Kroon

Chalmers, Kemi- och bioteknik, Polymerteknologi

R. Gehlhaar

Interuniversity Micro-Electronics Center at Leuven

Timothy Steckler

Chalmers, Kemi- och bioteknik, Polymerteknologi

Patrik Henriksson

Chalmers, Kemi- och bioteknik, Polymerteknologi

Christian Müller

Chalmers, Kemi- och bioteknik, Polymerteknologi

J. Bergqvist

Linköpings universitet

A. Hadipour

Interuniversity Micro-Electronics Center at Leuven

P. Heremans

Interuniversity Micro-Electronics Center at Leuven

Mats Andersson

Chalmers, Kemi- och bioteknik, Polymerteknologi

Solar Energy Materials and Solar Cells

0927-0248 (ISSN)

Vol. 105 280-286

Ämneskategorier

Kemi

DOI

10.1016/j.solmat.2012.06.029