posted on 2017-10-23, 00:00authored byYebyeol Kim, Jaehyun Bae, Hyun Woo Song, Tae Kyu An, Se Hyun Kim, Yun-Hi Kim, Chan Eon Park
Electrohydrodynamic-jet
(EHD-jet) printing provides an opportunity to directly assembled amorphous
polymer chains in the printed pattern. Herein, an EHD-jet printed
amorphous polymer was employed as the active layer for fabrication
of organic field-effect transistors (OFETs). Under optimized conditions,
the field-effect mobility (μFET) of the EHD-jet printed
OFETs was 5 times higher than the highest μFET observed
in the spin-coated OFETs, and this improvement was achieved without
the use of complex surface templating or additional pre- or post-deposition
processing. As the chain alignment can be affected by the surface
energy of the dielectric layer in EHD-jet printed OFETs, dielectric
layers with varying wettability were examined. Near-edge X-ray absorption
fine structure measurements were performed to compare the amorphous
chain alignment in OFET active layers prepared by EHD-jet printing
and spin coating.