TY - JOUR
T1 - Azeotropic binary solvent mixtures for preparation of organic single crystals
AU - Li, Xiaoran
AU - Kjellander, B. K.C.
AU - Anthony, John E.
AU - Bastiaansen, Cornelis W.M.
AU - Broer, Dirk J.
AU - Gelinck, Gerwin H.
N1 - Copyright:
Copyright 2010 Elsevier B.V., All rights reserved.
PY - 2009/11/23
Y1 - 2009/11/23
N2 - 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.
AB - 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.
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U2 - 10.1002/adfm.200901353
DO - 10.1002/adfm.200901353
M3 - Article
AN - SCOPUS:72849114720
VL - 19
SP - 3610
EP - 3617
IS - 22
ER -