Regensburg 2010 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 9: Crystallization and Self Assembly II
CPP 9.5: Vortrag
Montag, 22. März 2010, 15:00–15:15, H48
Novel method for the growth of highly crystalline P3HT thin films — •Shabi Thankaraj Salammal1, Martin Brinkmann2, Patrick Pingel3, Ullrich Pietsch1, Nils Koenen4, and Ullrich Scherf4 — 1Solid State Physics, University of Siegen — 2Institute Charles Sadron, Strasbourg. — 3Soft Matter Physics, University of Potsdam. — 4Macromolecular Chemistry, University of Wuppertal.
Role of growth temperature in crystallinity of P3HT thin films have been demonstrated here. Films were prepared at RT and -30°C above the OTS treated SiO2 substrate. X-ray diffracted intensity of -30°C grown film gained by the factor of 3 while comparing the films prepared on with and without OTS treated substrates. The degree of preferential orientation has been quantified via Chi scan, where incident and detector angle were fixed under specular condition of (100) Bragg peak. The OTS treated substrate provides a higher number of oriented crystallites than the non OTS treated one; it could be due to the possible interdigitation of OTS and P3HT polymer side chains. Diffracted intensity of -30°C grown film has one order of magnitude higher than the RT grown one. 2D x-ray diffraction pattern envisage the presence of flat and edge-on-orientation in RT grown film but flat-on-orientation is completely absent at -30°C casted one. X-ray diffraction has been confirmed by electron diffraction as well. HRTEM image envisage the presence of flat-on orientation in spin coated film. The luminescence intensity gained by the factor of two and mobility gained by one order of magnitude while comparing -30°C casted with RT, those results will be correlated with increase in conjugation length of the polymer.