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The thermal deposition and transfer Printing method had been used to producepentacene thin-films on SiO2/Si and plastic substrates (PMMA and PVP),respectively. X-ray diffraction patterns of pentacene thin films showedreflections associated with highly ordered polycrystalline films and acoexistence of two polymorph phases classified by their d-spacing, d(001): 14.4and 15.4 A.The dependence of the c-axis correlation length and the phasefraction on the film thickness and printing temperature were measured. Atransition from the 15.4 A phase towards 14.4 A phase was also observed withincreasing film thickness. An increase in the c-axis correlation length ofapproximately 12% ~16% was observed for Pn films transfer printed onto a PMMAcoated PET substrate at 100~120 C as compared to as-grown Pn films on SiO2/Sisubstrates. The transfer printing method is shown to be an attractive for thefabrication of pentacene thin-film transistors on flexible substrates partlybecause of the resulting improvement in the quality of the pentacene film.Comment: 5 pages, 5 figure

The effect of transfer printing on pentacene thin-film crystal structure