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Low energy ion scattering and X-ray photoelectron spectroscopy were used to study the surface of thin spin-coated poly(3-hexylthiophene) (P3HT) films on silica. We found that the composition of the outermost surface differs from that of the bulk due to the surface molecular structure: the sulphur atoms are screened from being at the outermost surface, presumably by the hexyl side-chains. The influence...
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