Abstract
In order to control both molecular and film structures simultaneously during film growth, we investigated organic molecular beam deposition in a photon field using KrF excimer laser ( λ = 248 nm). The preparation of bis(ethynylstyryl)benzene (BESB) films was carried out by this new method. The BESB films of trans-trans isomer were prepared by the sublimation of the cis-cis isomer and the following cis-to-trans photo-isomerization upon the laser irradiation. The laser-irradiation after or during deposition at the substrate temperature of 25°C yielded amorphous films. In contrast, the growth of the well-oriented crystalline films of the trans-trans isomer was achieved upon the laser-irradiation during deposition at the substrate temperature of 60°C. It can be explained that this crystal growth proceeded by the deposition of only the movable trans-trans isomer on the substrate surface. Thus it was found that organic molecular beam deposition combined with a photo-chemical reaction is effective for the control of molecular and film structures.
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