Azeotropic binary solvent mixtures for preparation of organic single crystals

X. Li, B.K.C. Kjellander, J.E. Anthony, C.W.M. Bastiaansen, D.J. Broer, G.H. Gelinck

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Abstract

Here, a new approach is introduced to prepare large single crystals of p-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 p–p stacked organic molecules to elucidate its broad applicability.
Original languageEnglish
Pages (from-to)3610-3617
Number of pages8
JournalAdvanced Functional Materials
Volume19
Issue number22
DOIs
Publication statusPublished - 2009

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