Slot-die coating of sol–gel-based organic–inorganic nanohybrid dielectric layers for flexible and large-area organic thin film transistors

Wang, Rixuan; Kwon, Hyeokjin; Tang, Xiaowu; Ye, Heqing; Park, Jin Young; Kim, Ju‐Young; Kong, Hoyoul; Kim, Se Hyun

doi:10.1016/j.apsusc.2020.147198

Cited by 21 publications

(14 citation statements)

References 39 publications

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“…Leakage current density levels below 10 –8 A cm –2 under a 30 V bias condition was observed in all the cases. As reported in previous studies, − the addition of the cross-linker (FPA-3F) or inorganic components in the polymeric network (AGPTi) led to an advanced dielectric strength in the EHD-printed GI layers. The leakage of current densities in both the GI bilayers (AGPTi+FPVDF and FCOC+FPVDF) further degraded (below 10 –10 A cm –2 under 30 V) due to the formation of advanced insulating layers on the single FPVDF-HFP layer.…”

Section: Resultssupporting

confidence: 64%

“…An electrostatic-force-assisted dispensing technique was utilized for the direct patterning of GI layers via EHD printing. After the fine control of ink formulation, six types of GIs were directly printed using four different dielectric materials(1) poly (vinylidene fluoro-co-hexafluoropropylene) (PVDF-HFP); (2) fluorophenyl azide (FPA)-3F based cross-linked PVDF-HFP (FPVDF-HFP); (3) cyclic olefin copolymer (COC) with FPA-3F (FCOC); (4) organic–inorganic hybrid material named AGPTi. , Covering the gate electrodes using the patterned GIs enabled the fabrication of a single OFET device, memory cells and complementary logic gates. We investigated the effects of various combinations of dielectric materials on the performance of the memory cells, complementary inverters, NAND, and NOR gates, all of which suggested that the selective GI printing technique contributed to a robust switching performance, non-destructive operations, and high gain values.…”

Section: Introductionmentioning

confidence: 99%

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Strategy for Selective Printing of Gate Insulators Customized for Practical Application in Organic Integrated Devices

Tang

Kwon

et al. 2020

ACS Appl. Mater. Interfaces

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Direct drawing techniques have contributed to the ease of patterning soft electronic materials, which are the building blocks of analog and digital integrated circuits. In parallel with the printing of semiconductors and electrodes, selective deposition of gate insulators (GI) is an equally important factor in simplifying the fabrication of integrated devices, such as NAND and NOR gates, and memory devices. This study demonstrates the fabrication of six types of printed GI layers (high/low-k polymer and organic–inorganic hybrid material), which are utilized as GIs in organic field-effect transistors (OFETs), using the electrostatic-force-assisted dispensing printing technique. The selective printing of GIs on the gate electrodes enables us to develop practical integrated devices that go beyond unit OFET devices, exhibiting robust switching performances, non-destructive operations, and high gain values. Moreover, the flexible integrated devices fabricated using this technique exhibit excellent operational behavior. Therefore, this facile fabrication technique can pave a new path for the production of practical integrated device arrays for next-generation devices.

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Section: Resultssupporting

confidence: 64%

Section: Introductionmentioning

confidence: 99%

Strategy for Selective Printing of Gate Insulators Customized for Practical Application in Organic Integrated Devices

Tang

Kwon

et al. 2020

ACS Appl. Mater. Interfaces

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“…Third, slot die coating based methods deposit the organic semiconductor solution onto a moving substrate directly through a coating head at a tunable rate. 67–70 Lin et al demonstrated highly ordered single crystalline TIPS pentacene films by using a roll-to-roll slot die coating method, and reported a mobility of 4.2 cm 2 V −1 s −1 for pristine TIPS pentacene. 71 Xie et al reported a roll-to-roll slot die coating method to fabricate thin film transistors.…”

Section: Introductionmentioning

confidence: 99%

Tailoring the molecular weight of polymer additives for organic semiconductors

Zhang

2022

Mater. Adv.

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“…Therefore, the R2R-based fabrication technique is essential for the low-cost and mass production of flexible pressure sensors. Gravure printing is a good candidate for making conductive patterns in the R2R process because of the long life of its printing roll and its high compatibility with the R2R process [13]. However, the behavior of ink in the printing phase is more complex than that of inkjet printing, spray, and slot-die coating, and several printing factors such as web speed and nip pressure have a major interactive effect on the printing quality, which significantly affects the performance of electronic devices such as thin film transistors and flexible capacitors [14][15][16].…”

Section: Introductionmentioning

confidence: 99%

Resistance Control of an Additively Manufactured Conductive Layer in Roll-to-Roll Gravure Printing Systems

Lee

Kim

et al. 2021

Int. J. of Precis. Eng. and Manuf.-Green Tech.

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Flexible pressure sensors, which are employed in robotic arms and electronic skin, are conventionally prepared using methods such three-dimensional printing, laser scribing, and spray coating. However, they are time-consuming and unsuitable for large-scale production. Thus, to overcome these limitations, roll-to-roll (R2R)-based fabrication techniques have been employed for low-cost mass production of flexible pressure sensors. Gravure printing is a promising R2R based technique, but it faces limitations in terms of ink-flow and printing defects causing short circuit, which may affect the performance of printed electronic devices. In this study, we analyzed the effects of printing conditions, web speed, tension, and nip pressure on the drag-out tail defects and conductance in the gravel printing process. We statistically optimized the optimal conditions to obtain minimum drag-out tail defects and conductance using a Box-Behnken design. We also fabricated two flexible pressure capacitive sensors using the conductive patterns to verify optimal conditions. Our results showed that the resistance decreased with increasing web speed, tension, and nip pressure, whereas the drag-out tail increased with increasing tension and nip pressure and decreasing web speed. Additionally, under the optimal conditions, the resistance and drag-out tail severity were improved by 74% and 53%, respectively, over those of the conventionally printed pattern. Finally, using the two flexible pressure capacitive sensors, we showed that the sensor using the conductive pattern had a higher sensitivity after optimization.

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Slot-die coating of sol–gel-based organic–inorganic nanohybrid dielectric layers for flexible and large-area organic thin film transistors

Cited by 21 publications

References 39 publications

Strategy for Selective Printing of Gate Insulators Customized for Practical Application in Organic Integrated Devices

Strategy for Selective Printing of Gate Insulators Customized for Practical Application in Organic Integrated Devices

Tailoring the molecular weight of polymer additives for organic semiconductors

Resistance Control of an Additively Manufactured Conductive Layer in Roll-to-Roll Gravure Printing Systems

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