Films of 6-dibutylamino-1,3,5-triazine-2,4-dithiol (DB) were formed on the metal substrate by the conventional vacuum deposition method. The metal substrates were treated by baking and unbaking under ultra high vacuum condition to remove adsorbed gases. Adsorption probability, desorption, and molecular structures of DB were investigated using ellipsometry and XPS about the influence of substrate cleanliness for adsorption gases. The results showed that the adsorption probability of DB was small

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... on the baked substrate cornpared the with the unbaked substrate within a few nm thickness of the film, and the desorption of DB did not occur easily on the surface of the unbaked substrate. The structure characterized with XPS showed DB molecules formed easily disulfide bonds and mercaptide bonds on the unbaked substrate surface. It is suggested that adsorbed gases on metal substrates originated polymerization of DB and chemical adsorption to the metal surface.