Journal
COLLOID AND POLYMER SCIENCE
Volume 282, Issue 8, Pages 932-938Publisher
SPRINGER
DOI: 10.1007/s00396-004-1100-9
Keywords
semicrystalline morphology; thin films; poly(3-hexylthiophene); thermodynamics; phase behavior; morphology; crystals
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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 degreesC 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 T(g)approximate to-3 degreesC. 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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