Oblique Incidence Organic Molecular Beam Deposition and Nonlinear Optical Properties of Organic Thin Films with a Stable In-Plane Directional Order

The in-situ alignment of dipolar molecules in an organic thin film is demonstrated here for the first time with organic molecular beam deposition. At elevated temperatures, the supramolecular polymer is degraded into monomers and evaporated from the effusion cell (d in the Figure) at < 10–8 mbar onto the substrate (a) where they polymerize again in a head-to-tail arrangement. Growth rate and film thickness are measured in situ with monolayer sensitivity by the quartz crystal thickness monitor (b) and the ellipsometer (c).