A twisted polydiacetylene quantum wire: Influence of conformation on excitons in polymeric quasi-1D systems

Antoine Al Choueiry (1) , Thierry Barisien (1) , Jéremy Holcman (1) , Laurent Legrand (1) , Michel Schott (1) , Gerhardt Weiser (2) , Mirela Balog (3) , Jérôme Deschamps (3) , Sylvain G. Dutremez (3) , Jean-Sébastien Filhol (3)

1 INSP - Institut des Nanosciences de Paris
2 Fachbereich Physik [Marburg]
3 ICGM ICMMM - Institut Charles Gerhardt Montpellier - Institut de Chimie Moléculaire et des Matériaux de Montpellier

Highly luminescent isolated polydiacetylene (PDA) chains in a new diacetylene crystal are studied. The diacetylene crystal structure and theoretical calculations suggest that the chains are not planar and more strongly twisted than any known PDA. Yet the chains behave as quasi perfect quantum wires, showing that this behaviour is generic among PDA, provided crystal order is high enough. The exciton energy, E0, is higher than in any other well ordered PDA providing a relationship between E0 and twist angle. On the other hand the exciton binding energy and Bohr radius are significantly affected as demonstrated in electroabsorption experiments (and developed in a companion paper).

Mots clés: Conjugated polymer; quantum wire; radiative properties

Domaines: Autre [cond-mat.other]

Antoine Al Choueiry, Thierry Barisien, Jéremy Holcman, Laurent Legrand, Michel Schott, et al.. A twisted polydiacetylene quantum wire: Influence of conformation on excitons in polymeric quasi-1D systems. 2009. ⟨hal-00441089⟩