Title
Azeotropic binary solvent mixtures for preparation of organic single crystals
Author
Li, X.
Kjellander, B.K.C.
Anthony, J.E.
Bastiaansen, C.W.M.
Broer, D.J.
Gelinck, G.H.
TNO Industrie en Techniek
Publication year
2009
Abstract
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.
Subject
Abrupt transition
Active Layer
Azeotropic points
Binary solvent mixtures
Binary solvents
Conjugated organic molecules
Homogeneous solutions
In-field
New approaches
Organic molecules
Organic single crystals
Pentacenes
Polycrystalline
Self-assembled
Solvent composition
Binary mixtures
Carrier mobility
Field effect transistors
Morphology
Solvents
Trichloroethylene
Single crystals
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DOI
https://doi.org/10.1002/adfm.200901353
TNO identifier
279967
ISSN
1616-301X
Source
Advanced Functional Materials, 19 (22), 3610-3617
Document type
article