Recently, it has been demonstrated that solvent-vapor-induced crystallization of triethylsilylethynyl anthradithiophene (TES ADT) thin films can be directed on millimeter length scales along arbitrary paths by controlling local crystal growth rates via pre-patterning the substrate. Here, we study the influence of capillary effects on crystallization along such channels. We first derive an analytical expression for the steady-state growth front velocity as a function of channel width and validate it with numerical simulations. Then, using data from TES ADT guided crystallization experiments, we extract a characteristic channel width, which provides the smallest feature size that can be obtained by this technique.
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A.F. and A.K.H. acknowledge the National Science Foundation for Graduate Research Fellowships under Grant No. DGE 1148900. A.G. acknowledges the Princeton Environmental Institute through the Grand Challenges Program for summer funding. Y.-L.L. and J.E.A. acknowledge NSF funding through the SOLAR Initiative (Nos. DMR-1035217 and DMR-1035257) and Y.-L.L. acknowledges MRSEC funding through the Princeton Center for Complex Materials (No. DMR-0819860).
Fang, Alta; Hailey, Anna K.; Grosskopf, Abigail; Anthony, John E.; Loo, Yueh-Lin; and Haataja, Mikko, "Capillary Effects in Guided Crystallization of Organic Thin Films" (2015). Chemistry Faculty Publications. 32.