CINaM - Centre Interdisciplinaire de Nanoscience de Marseille


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jeudi 10 Janvier 2019 à 14H00
CINaM - Salle Raymond Kern
Prof. Wouter Maes
UHasselt, Institute for Materials Research (IMO-IMOMEC), Design & Synthesis of Organic Semiconductors (DSOS), Agoralaan 1, 3590 Diepenbeek, Belgium
On the ‘True’ Structure of Push-Pull Type Low Bandgap Polymers for Organic Electronics

Donor-acceptor or push-pull type conjugated polymers have become a dominating class of active materials in the field of organic electronics. Their adjustable light-harvesting, charge transfer and charge transport characteristics have been beneficially applied in organic photovoltaics, photodetectors and thin-film transistors. The conventional synthetic approach toward these push-pull polymers is based on Suzuki or (mostly) Stille cross-coupling of complementary functionalized heterocyclic precursors. In the ideal world, this should give rise to a perfect alternation of the employed building blocks throughout the polymer backbone and this alternation of electron rich (donor/push) and electron deficient (acceptor/pull) moieties leads to a substantial decrease of the bandgap. In recent years, however, it has become increasingly clear that the ‘real’ structure of the resulting alternating copolymers is often quite different from the projected one [1]. Structural imperfections can for instance result from homocoupling of two identical building blocks. Furthermore, the end groups of these donor-acceptor copolymers are often also not those expected or targeted.

In this contribution, recent results from our group will be presented, providing insights on the impact of homocoupling ‘defects’ on the device characteristics of organic solar cells [2-4]. Additionally, different types of end groups were identified via MALDI-TOF mass spectrometry.


[1] Pirotte G, Verstappen P, Vanderzande D, Maes W, Advanced Electronic Materials, 1700481 (2018); [2] Vangerven T, Verstappen P, Drijkoningen J, Dierckx W, Himmelberger S, Salleo A, Vanderzande D, Maes W, Manca JV, Chemistry of Materials, 27, 3726 (2015); [3] Vangerven T, Verstappen P, Patil N, D’Haen J, Cardinaletti I, Benduhn J, Van den Brande N, Defour M, Lemaur V, Beljonne D, Lazzaroni R, Champagne B, Vandewal K, Andreasen JW, Adriaensens P, Breiby DW, Van Mele B, Vanderzande D, Maes W, Manca J, Chemistry of Materials, 28, 9088 (2016); [4] Pirotte G, Kesters J, Cardeynaels T, Verstappen P, D’Haen J, Lutsen L, Champagne B, Vanderzande D, Maes W, Macromolecular Rapid Communications, 39, 1800086 (2018).

Invitation : Gabriel Canard - Entrée libre