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In this paper we report X-ray diffraction measurements and UV-visible spectra of thin film of 8T oligothiophene grown at two substrate temperatures 25 and 175 o C. We also report the scanning electron microscopy pictures of 8T films deposited at different temperatures (25, 120, 150 and 175 o C). These experimental results account for a different structural organization of organic molecules...
Thin film transistors were made with vacuum evaporated sexithiophene and octithiophene. Scanning electron microscopy shows that the films are polycrystalline, with a grain size that increases when the temperature of the substrate is increased. The carrier mobility of the film increases with grain size. It is thermally activated for small grains, but becomes temperature independent for larger grains...
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