Control of the coffee ring effect during R2R gravure printing for minimizing threshold voltage variation in printed carbon nanotube-based thin film transistors

Parajuli, Sajjan; Tiara, A.M.; Moon, Hyeokgyun; Shrestha, Sagar; Yang, Hao; Park, Jinhwa; Jung, Younsu; Lee, Jinkee; Cho, Gyoujin

doi:10.1016/j.mtadv.2023.100385

Cited by 2 publications

(1 citation statement)

References 47 publications

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“…A detailed description is provided in a later section. In the drying section, the thickness of the functional layer is affected by the coffee ring effect, in which the solvent is concentrated on the edge of the droplet as the solvent evaporates, as well as the CMD and MD temperature deviations of the web inside the dryer [ 30 , 31 ]. In the rewinding section, the web is wound in a tension profile that gradually decreases with time.…”

Section: Theoretical Backgroundmentioning

confidence: 99%

Control of Meniscus Formation Using an Electrohydrodynamics Module in Roll-to-Roll Systems for the Stable Coating of Functional Layers

Kim,

Jo,

Noh

et al. 2024

Polymers

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In fabricating functional layers, including thin-film transistors and conductive electrodes, using roll-to-roll (R2R) processing on polymer-based PET film, the instability of the slot-die coating meniscus under a high-speed web impedes functional layer formation with the desired thickness and width. The thickness profiles of the functional layers significantly impact the performance of the final products. In this study, we introduce an electrohydrodynamic (EHD)-based voltage application module to a slot-die coater to ensure the uniformity of the cross-machine direction (CMD) thickness profile within the functional layer and enable a stable, high-speed R2R process. The module can effectively control the spreadability of the meniscus by utilizing variations in the surface tension of the ink. The effectiveness of the EHD module was experimentally verified by applying a high voltage to a slot-die coater while keeping other process variables constant. As the applied voltage increases, the CMD thickness deviation reduces by 64.5%, and the production rate significantly increases (up to 300%), owing to the formation of a stable coated layer. The introduction of the EHD-based application module to the slot-die coater effectively controlled the spreadability of the meniscus, producing large-area functional layers.

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Section: Theoretical Backgroundmentioning

confidence: 99%

Control of Meniscus Formation Using an Electrohydrodynamics Module in Roll-to-Roll Systems for the Stable Coating of Functional Layers

Kim,

Jo,

Noh

et al. 2024

Polymers

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High Mobility Amorphous Polymer‐Based 3D Stacked Pseudo Logic Circuits through Precision Printing

Kim,

Ryu,

Nam

et al. 2024

Adv Funct Materials

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Direct printing of conjugated polymer thin‐film transistors enables the fabrication of deformable devices with low cost, high throughput, and large area. However, a relatively poor device performance of printed devices remains a major obstacle to their application in high‐end display backplanes and integrated circuits. In this study, high‐performance and highly stackable printed organic transistors is developed, arrays, and circuits using a near‐amorphous polymer, indacenodithiophene‐co‐benzothiadiazole (IDT‐BT). The printed devices exhibited high saturation mobility (>1 cm2 V−1 s−1), high on/off ratio (>107), and low subthreshold slope (245 mV dec−1). In addition, 16 × 16 printed IDT‐BT arrays achieved 100% fabrication yield, with excellent device‐to‐device uniformity and low variations of mobility (9.55%) and threshold voltage (4.51%), and good operational and environmental stability (>365 days). Furthermore, five stacked 3D transistors are demonstrated with an excellent 3D uniformity without compromising device performance due to a low required thermal budget for processing amorphous IDT‐BT. Finally, a new concept of 3D universal logic gate with high voltage gain (33.91 V/V) and record density (100 printed transistors per cm2) is proposed and fabricated, which is relevant for the commercialization of low‐cost printed display backplanes and high‐density integrated circuits based on highly processable polymeric semiconductors.

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Control of the coffee ring effect during R2R gravure printing for minimizing threshold voltage variation in printed carbon nanotube-based thin film transistors

Cited by 2 publications

References 47 publications

Control of Meniscus Formation Using an Electrohydrodynamics Module in Roll-to-Roll Systems for the Stable Coating of Functional Layers

Control of Meniscus Formation Using an Electrohydrodynamics Module in Roll-to-Roll Systems for the Stable Coating of Functional Layers

High Mobility Amorphous Polymer‐Based 3D Stacked Pseudo Logic Circuits through Precision Printing

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