Titre complet :
Molecular Engineering of Pi-Conjugated Systems for Organic Electronics: New Donor-Acceptor Building Blocks for Tuning the Band Gap of Materials
Cette conférence sera prononcée par le professeur Pierre Frère de l'Université d'Angers.
Hôte : Professeur William Skene
Résumé:
Thiophene based conjugated materials represent one of the most widely investigated classes of functional pi-conjugated systems, motivated by their potential technological applications as organic semi-conducting materials for the fabrication of (opto)electronic devices such field-effect transistors (OFET), electroluminescent diodes (OLED) and photovoltaic cells. Careful modifications on the conjugated backbone allow to control the energy levels of the HOMO and LUMO frontier orbitals and thus to tune the band gap and the electronic properties of the materials. Among the different strategies for controlling the bandgap of the materials, the D/A approach consisting to insert both donor and acceptor blocks on the conjugated backbone has given rise polymers or oligomers presenting the best performances in organic solar cells.
In this context, we have developed new D/A building blocks in which the D and A groups are grafted on the 3 and 4 positions of a thiophene cycle. The development of new conjugated materials with original properties has been pursued from these building blocks. The different synthetic approaches and the relationship between the electronic properties and the molecular structures of these new materials will be presented.
