Abstract
We demonstrate a high throughput roll-to-roll process for
preparing organic top gate transistors with metallic
electrodes on a flexible substrate. The source and drain
electrodes are prepared by patterning a roll-to-roll
evaporated silver layer with a printable etchant. The
etching step is done by a screen printing process with a
novel triblock copolymer based etching ink, which enables
etching in just a few seconds at low temperatures. The
method allows 100 µm resolution in the roll process and
can produce thin (35 nm), smooth and nonporous electrodes
with high conductivity. In addition, the process is
independent on the printing direction and area, providing
freedom of design. The polymeric semiconductor and
insulator layers are deposited with roll-to-roll gravure
printing, which allows orientation - and thus performance
- of the semiconducting polymer to be controlled by the
cup size and printing direction. The gate is printed with
rotary screen, using a solvent-free silver paste as the
ink. The properties of the prepared organic transistors
are typical for fully printed devices: mobility of
0.017-0.026 cm2/(V s) and ON/OFF-ratio of 102-103 were
reached and the leakage current was very low (
Original language | English |
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Pages (from-to) | 8-14 |
Journal | Organic Electronics |
Volume | 20 |
DOIs | |
Publication status | Published - 2015 |
MoE publication type | A1 Journal article-refereed |
Keywords
- roll-to-roll
- etching
- gravue printing
- screen printing
- organic transistor