Self-Organization of Inkjet-Printed Organic Semiconductor Films Prepared in Inkjet-Etched Microwells
- Self-Organization of Inkjet-Printed Organic Semiconductor Films Prepared in Inkjet-Etched Microwells
- 곽동훈; 임정아; 강보석; 이위형; 조길원
- inkjet; microwell; organic transistor; self-organization
- Issue Date
- Advanced functional materials
- VOL 23, 5224-5231
- The high-precision deposition of highly crystalline organic semiconductors by
inkjet printing is important for the production of printed organic transistors.
Herein, a facile nonconventional lithographic patterning technique is developed
for fabricating banks with microwell structures by inkjet printing solvent
droplets onto a polymer layer, thereby locally dissolving the polymer to form
microwells. The semiconductor ink is then inkjet-printed into the microwells.
In addition to confi ning the inkjet-printed organic semiconductor droplets, the
microwells provide a platform onto which organic semiconductor molecules
crystallize during solvent evaporation. When printed onto the hydrophilic
microwells, the inkjet-printed 6,13-bis(triisopropylsilylethynyl) pentacene
(TIPS_PEN) molecules undergo self-organization to form highly ordered
crystalline structures as a result of contact line pinning at the top corner of
the bank and the outward hydrodynamic fl ow within the drying droplet. By
contrast, small crystallites form with relatively poor molecular ordering in
the hydrophobic microwells as a result of depinning of the contact line along
the walls of the microwells. Because pinning in the hydrophilic microwells
occurred at the top corner of the bank, treating the surfaces of the dielectric
layer with a hydrophobic organic layer does not disturb the formation of the
highly ordered TIPS_PEN crystals. Transistors fabricated on the hydrophilic
microwells and the hydrophobic dielectric layer exhibit the best electrical
properties, which is explained by the solvent evaporation and crystallization
characteristics of the organic semiconductor droplets in the microwell.
These results indicate that this technique is suitable for patterning organic
semi conductor deposits on large-area fl exible substrates for the direct-write
fabrication of high-performance organic transistors.
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