3D integration of printed organic dual-gate FETs on a flexible substrate
- Title
- 3D integration of printed organic dual-gate FETs on a flexible substrate
- Authors
- KWON, JIMIN; JUNG, SUNGJUNE; CHO, KIL WON; Shizuo Tokito; Yasunori Takeda; Rei Shiwaku
- Date Issued
- 2018-07-02
- Publisher
- ICSM
- Abstract
- The direct printing of organic thin-film transistors(TFTs) gives us a facile and fast route to fabrication of freeform
electronicapplications on a flexible substrate. However, despite the significantimprovement in the performances of
organic semiconductors, electronics industrystill has not adopted the printed organic TFTs for manufacturing
electronic applications.The low resolution, large feature size, and variation of inkjet printing havelimited the
implementation of organic integrated circuits with reasonabletransistor densities and uniformity. To overcome these
problems, we have developeda robust inkjet design rule optimized for high-yield circuit patterning, and fabricatea
three-dimensional (3D) printed dual-gate (DG) organic TFT where n- and p-typeTFTs are stacked in
transistor-on-transistor manner halving the transistor footprint. In this work, all the functional layers including
electrodes andsemiconductors are fully printed except a parylene dielectric that is formed bychemical vapor
deposition. The design rule has been developed via a systematic study on the influenceof inkjet printing
parameters such as substrate temperature, drop spacing) on theminimum width, smoothness, and reproducibility of
vertically or horizontally printedmetal lines. The stacked DG TFTs showed average carrier mobilities of around
0.2and 0.7 cm2V-1s-1 for the n-type and p-type, respectively,showing exceptional uniformity and long-term stability
at 5 V operation voltage.We successfully demonstrated 7-stage ring-oscillator on a flexible PEN film withthe
maximum frequency of 200 Hz and a gate delay of 340 ms. Our 3D printing approach providesa path for achieving
high transistor density, high yield, high uniformity, andlong-term stability, which are critical for the realization of
printed organic electronicsapplications.
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/94031
- Article Type
- Conference
- Citation
- International Conference on Science and Technology of Synthetic Metals 2018 (ICSM 2018), 2018-07-02
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