Abstract
An inkjet printing method for directional crystallization
was proposed that employs difference in surface energy to induce film
growth with higher crystallinity and orderliness. Inkjet printing
of 6,13-bis(triisopropyl- silylethynyl) pentacene, a small-molecule
semiconductor was performed as a single-line film with the starting
point set on a patch of Au film, which had been surface-treated to
have a slightly higher dispersive surface energy than the dielectric
substrate. A larger dispersive surface energy on the metal resulted
in advanced contact-line pinning thereof between the liquid and the
substrate and induced film growth along the printing direction. With
the influence of the differential surface energy, larger grain size
as well as more convergent crystalline microstructure was obtained,
which is beneficial to the fabrication of organic thin-film transistors
with improved electrical performance and device-to-device uniformity.
© 2015 IEEE
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