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Please use this identifier to cite or link to this item: http://hdl.handle.net/1942/4149

Title: Low band gap donor-acceptor conjugated polymers toward organic solar cells applications
Authors: CLEIJ, Thomas
LUTSEN, Laurence
Nguyen, L.H
Neugebauer, Helmut
Sariciftci, Serdar
Aguirre, Aranzazu
Goovaerts, Etienne
Janssen, Griet
Issue Date: 2007
Citation: MACROMOLECULES, 40(1). p. 65-72
Abstract: Mixtures of conjugated polymers and fullerenes command considerable attention for application in organic solar cells. To increase their efficiency, the design of new materials that absorb at longer wavelengths is of substantial interest. We have prepared such low band gap polymers using the donor-acceptor route, which is based on the concept that the interaction between alternating donors and acceptors results in a compressed band gap. Furthermore, for application in photovoltaic devices, sufficient polymer solubility is required. We have prepared four low band gap conjugated polymers, with a bis(1-cyano-2-thienylvinylene)phenylene base structure, and achieved an excellent solubility by the introduction of long alkoxy and alkyl side chains. The polymers were synthesized via an oxidative polymerization. Their electronic properties were determined from electrochemical and optical measurements, which confirm that they indeed have a low band gap. In the blend of such a low band gap polymer with PCBM, evidence for efficient charge transfer was obtained from PL and EPR measurements. However, bulk heterostructure solar cells made of such blends display only low efficiencies, which is attributed to low charge carrier mobilities.
Notes: Hasselt Univ, IMO, B-3590 Diepenbeek, Belgium. IMEC, Div IMOMEC, B-3590 Diepenbeek, Belgium. Johannes Kepler Univ, Linz Inst Organ Solar Cells, A-4040 Linz, Austria. Univ Antwerp, Dept Phys, B-2610 Antwerp, Belgium.VANDERZANDE, D, Hasselt Univ, IMO, Agoralaan,Bldg D, B-3590 Diepenbeek, Belgium.dirk.vanderzande@uhasselt.be
URI: http://hdl.handle.net/1942/4149
DOI: 10.1021/ma061760i
ISI #: 000243156700011
ISSN: 0024-9297
Category: A1
Type: Journal Contribution
Validation: ecoom, 2008
Appears in Collections: Research publications

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