Semicrystalline morphology in thin films of poly(3-hexylthiophene) |
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| Authors: | S?Hugger R?Thomann T?Heinzel Email author" target="_blank">T?Thurn-AlbrechtEmail author |
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| Institution: | (1) Physikalisches Institut, Albert-Ludwigs-Universität Freiburg, Hermann-Herder-Str. 3, 79104 Freiburg, Germany;(2) Freiburger Materialforschungszentrum und Institut für Makromolekulare Chemie, Albert-Ludwigs-Universität Freiburg, Stefan-Meier-Str. 21, 79104 Freiburg;(3) Fachbereich Physik, Martin-Luther-Universität Halle-Wittenberg, 06099 Halle, Germany |
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| Abstract: | The thermodynamic phase behavior and the morphology in thin films of poly(3-hexylthiophene) (P3HT) has been studied using calorimetry, X-ray scattering, and scanning force microscopy (AFM). Around 225 °C a phase transition from the crystalline state to a layered, liquid crystalline structure occurs in regioregular P3HT, while the regiorandom counterpart material is disordered at all temperatures and displays a glass transition temperature Tg –3 °C. Regioregular P3HT is semicrystalline and forms needle or plate like crystallites which in solution cast thin films are oriented with respect to the substrate. Films produced by spin coating display a non-equilibrium structure with reduced order and orientation. Annealing of these films in the liquid crystalline state leads to the formation of a morphology similar to the one observed in solution cast films. |
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| Keywords: | Semicrystalline morphology Thin films Poly(3-hexylthiophene) Thermodynamics Phase behavior Morphology Crystals |
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