Controlling the surface wettability of the polymer dielectric for improved resolution of inkjet-printed electrodes and patterned channel regions in low-voltage solution-processed organic thin film transistors

Tang, Wei; Feng, Linrun; Jiang, Chen; Yao, Guangyu; Zhao, Jiaqing; Cui, Qingyu; Guo, Xiaojun

doi:10.1039/c4tc00343h

Cited by 30 publications

(21 citation statements)

References 38 publications

(34 reference statements)

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“…Functionalized pentacene with side chains was therefore synthesized to achieve face-to-face molecular stacking [88], [175]. By using TIPS-pentacene blended with PS, Guo et al demonstrated low-voltage organic TFTs with reduced trap density [176]- [178]. These functionalization methods were also applicable to other organic semiconductors, such as BTBT [179], DNTT [180], and dithieno [2,3- [181].…”

Section: ) Reduced Trap Densitymentioning

confidence: 99%

Flexible Ultralow-Power Sensor Interfaces for E-Skin

2019

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Thin-film electronics has hugely benefitted from low-cost processes, large-area processability, and multi-functionality. This has not only stimulated innovation in display and sensor technology, but has also demonstrated great potential for integration of components for human-machine interfaces. For electronics to be deployed as sensor interfaces and signal processing, the quest for low power is compelling due to the inherently limited battery lifetime. This review will present the state-of-the-art in thin film electronics and demonstrate examples of low-cost printable transistors and biosensors that are flexible/stretchable for wearable and other applications. Ultralow power design for thin-film transistors will be discussed from the standpoint of reducing both operating voltage and operating current, taking into account the challenges in meeting frequency requirements. Compact models for circuit design will be reviewed along with new insights into ultralow power transistors and high gain amplifier circuits. Finally, a concept for an integrated system comprising sensors and interfacing circuits will be demonstrated, which has the potential to enable battery-less operation.

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Section: ) Reduced Trap Densitymentioning

confidence: 99%

Flexible Ultralow-Power Sensor Interfaces for E-Skin

2019

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“…Then the contact angle turns to be the only alternatively optimized parameter, which is relevant to surface energy of the substrate and also the material ink. An effective method to modulate the surface wettability of the PVA would be using a fluoroalkyl silanes-trichloro(1H,1H,2H,2H-perfluorooctyl)silane (FOTS) self-assembled monolayers (SAMs) [64]. It can be seen that the PVA surface became much less wettable after FOTS modification with the measured water contact angle increasing from 54° to 118° and ink contact angle from 15° to 52°, respectively, as shown in Figure 4(a).…”

Section: Inkjet-printed Fine Silver Electrodes For Otftsmentioning

confidence: 99%

Printing of Fine Metal Electrodes for Organic Thin‐Film Transistors

Guo¹,

Tang²,

Chen³

et al. 2016

Printed Electronics - Current Trends and Applications

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Attributed to the excellent mechanical flexibility and compatibility with low-cost and high-throughput printing processes, the organic thin-film transistor (OTFT) is a promising technology of choice for a wide range of flexible and large-area electronics applications. Among various printing techniques, the drop-on-demand inkjet printing is one of the most versatile ones to form patterned electrodes with the advantages of mask-less patterning, non-contact, low cost, and scalability to large-area manufacturing. However, the limited positional accuracy of the inkjet printer system and the spreading of the ink droplets on the substrate surface, which is influenced by both the ink properties and the substrate surface energy, make it difficult to obtain fine-line morphologies and define the exact channel length as required, especially for relatively narrow-line and short-channel patterns. This chapter introduces the printing of uniform fine silver electrodes and down scaling of the channel length by controlling ink wetting on polymer substrate. All-solution-processed/printable OTFTs with short channels (<20 µm) are also demonstrated by incorporating fine inkjet-printed silver electrodes into a low-voltage (<3 V) OTFT architecture. This work would provide a commercially competitive manufacturing approach to developing printable lowvoltage OTFTs for low-power electronics applications.

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“…For that purpose, patterning of the channel layer is necessary to eliminate parasitic leakage and reduce crosstalk among neighboring devices. Various patterning techniques have been developed including dry-etching with photoresist mask [6], inkjet printing [7], laser patterning [8] and self-organization [9]. Considering the achievable feature resolution and process accuracy, dry-etching with photolithographic patterned photoresist mask is still a preferred Manuscript choice, which also benefits from the well-established manufacturing facilities in the industry [10].…”

Section: Introductionmentioning

confidence: 99%

Top-Gate Dry-Etching Patterned Polymer Thin-Film Transistors With a Protective Layer on Top of the Channel

Tang

Zhao

Feng

et al. 2015

IEEE Electron Device Lett.

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Abstract-Photolithographic and dry-etching processes are developed to pattern the organic semiconductor (OSC) layer for top-gate organic thin-film transistors (OTFTs). A fluorine polymer layer is used to protect the OSC surface from the patterning processes so that the common photoresist can be used. The ON/OFF current ratios of the patterned OTFTs are improved by about one order of magnitude compared to that of unpatterned devices. However, it is shown that removing the polymer protective layer can cause degraded subthreshold behavior due to increased interface trap density at the semiconductor/dielectric interface. A process without removing the polymer protective layer is thus developed to address this issue, and is shown to be able to provide a reliable route to achieve patterned top-gate OTFTs with high ON/OFF current ratio, small subthreshold swing and negligible hysteresis.

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Controlling the surface wettability of the polymer dielectric for improved resolution of inkjet-printed electrodes and patterned channel regions in low-voltage solution-processed organic thin film transistors

Cited by 30 publications

References 38 publications

Flexible Ultralow-Power Sensor Interfaces for E-Skin

Flexible Ultralow-Power Sensor Interfaces for E-Skin

Printing of Fine Metal Electrodes for Organic Thin‐Film Transistors

Top-Gate Dry-Etching Patterned Polymer Thin-Film Transistors With a Protective Layer on Top of the Channel

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