Face-on oriented bilayer of two discotic columnar liquid crystals for organic donor-acceptor heterojunction.
In this work, we report the achievement of a homeotropically (or face-on) oriented bilayer formed by a pair of discotic materials designed with specific properties: selective solubility, adjusted transition temperatures, and room temperature hexagonal columnar liquid-crystalline phase. The homeotropic orientation of the bilayer which is only a few hundred nanometers thick is performed by solution-processed deposition followed by thermal annealing in the geometry of open supported films and is evidenced by X-ray scattering. This represents the first proof of principle of an organic heterojunction based on two oriented columnar liquid crystal layers.
Thiebaut
Olivier
O
Centre de Recherche Paul-Pascal, CNRS-Université de Bordeaux, 115 Avenue Schweitzer, 33600 Pessac, France.
Bock
Harald
H
Grelet
Eric
E