Azeotropic binary solvent mixtures for preparation of organic single crystals
article
Here, a new approach is introduced to prepare large single crystals of π-conjugated organic molecules from solution. Utilizing the concept of azeotropism, single crystals of tri-isopropylsilylethynyl pentacene (TIPS-PEN) with dimensions up to millimeters are facilely self-assembled from homogeneous solutions comprising two solvents with opposing polarities and a positive azeotropic point At solvent compositions close to the azeotropic point, an abrupt transition of morphology from polycrystalline thin-films to large single crystals is found. How to adjust the initial ratio of the binary solvents so that the change in solvent composition during evaporation favors the specific H-aggregation and promotes an efficient self-assembly of TIPS-PEN is explained. The charge-carrier (hole) mobilities are substantially enhanced by a factor of 4 from the morphology of thin-films to large single crystals used as active layer in field-effect transistors. Additionally this approach is extended to other π-π stacked organic molecules to elucidate its broad applicability. © 2009 WILEY-VCH Verlag GmbH & Co. KGaA.
Topics
Abrupt transitionActive LayerAzeotropic pointsBinary solvent mixturesBinary solventsConjugated organic moleculesHomogeneous solutionsIn-fieldNew approachesOrganic moleculesOrganic single crystalsPentacenesPolycrystallineSelf-assembledSolvent compositionBinary mixturesCarrier mobilityField effect transistorsMorphologySolventsTrichloroethyleneSingle crystals
TNO Identifier
279967
ISSN
1616301X
Source
Advanced Functional Materials, 19(22), pp. 3610-3617.
Pages
3610-3617
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