Balance of surface energy difference between wetting and dewetting regions for patterning solution-processed organic light-emitting diode

Park, Hea‐Lim; Kang, Sujie; Suh, Jeng-Hun; Lee, Sin‐Doo; Lee, Sin‐Hyung

doi:10.1016/j.orgel.2021.106203

Cited by 5 publications

(2 citation statements)

References 25 publications

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“…Conducting polymers (CPs) are promising candidates for flexible electrodes owing to their high conductivities and superior mechanical flexibilities. − To date, several methods for patterning CP, such as inkjet printing, self-organization, , and micromolding in capillaries (MIMIC), − have been utilized. Among these, MIMIC is a cost-effective and efficient tool for producing organic patterns in a simple manner.…”

Section: Introductionmentioning

confidence: 99%

Organizing Reliable Polymer Electrode Lines in Flexible Neural Networks via Coffee Ring-Free Micromolding in Capillaries

Park

Kim

et al. 2022

ACS Appl. Mater. Interfaces

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With an increase in the demand for smart wearable systems, artificial synapse arrays for flexible neural networks have received considerable attention. A synaptic device with a two-terminal configuration is promising for complex neural networks because of its ability to scale to a crossbar array architecture. To realize practical crossbar arrays with a high density, it is essential to achieve reliable electrode lines that act as signal terminals. However, an effective method to develop intrinsically flexible signal lines in artificial neural networks has not been developed. In this study, we achieved reliable polymer signal lines for flexible neural networks using coffee ring-free micromolding in capillaries (MIMIC). In a typical MIMIC, the outward convective flow of the polymer solution inherently deteriorates the pattern fidelity. To achieve reliable conducting polymer (CP) lines, we precisely controlled the flow of the polymer solution in the MIMIC by inducing the Marangoni force. When the convective and Marangoni flows for the solution were balanced in the MIMIC, the CP line patterns were reliably produced with high fidelity. The developed CP lines exhibited superior conductivity and high mechanical flexibility. Moreover, flexible memristor arrays consisting of CP signal lines demonstrated a high potential for realizing practical neuromorphic systems linked to artificial intelligence.

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Section: Introductionmentioning

confidence: 99%

Organizing Reliable Polymer Electrode Lines in Flexible Neural Networks via Coffee Ring-Free Micromolding in Capillaries

Park

Kim

et al. 2022

ACS Appl. Mater. Interfaces

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“…Organic electronics such as organic light-emitting diodes (OLEDs) and organic field-effect transistors have gained considerable attention owing to their potential applications to flexible electronics. − One of the important processes for fabricating these organic electronics is the patterning of organic semiconducting films . In particular, for virtual reality/augmented reality displays, high-resolution patterns (several micrometers) are required for OLEDs. , For patterning of OLEDs, a fine metal mask (FMM) is primarily used, but FMM suffers from the difficulty of creating high-resolution patterns of several micrometers because of the sagging phenomenon of shadow masks, which results in shadowed areas among the pixels.…”

Section: Introductionmentioning

confidence: 99%

Systematic Investigation of Subtractive Contact Patterning for High-Resolution Organic Electronic Devices

Lee

Park

Lee

et al. 2023

ACS Appl. Electron. Mater.

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We systematically investigated the mechanism of subtractive contact patterning (SCP) and demonstrated high-resolution organic light-emitting diodes (OLEDs) using this SCP process. Owing to the application of the SCP process to various types of organic semiconducting thin films, crystalline thin films (e.g., pentacene) generated patterns via the delamination mechanism and amorphous small molecule thin films (e.g., tris(8-hydroxyquinolinato)aluminum) generated patterns via the diffusion mechanism. In the pattern generation via diffusion, we reported that the higher the processing temperature and the longer the processing time were, the deeper was the pattern depth. In particular, the patterning speed was proportional to the temperature in an exponential function. SCP can be applied to doped small molecule-based thin films and limitedly applied to polymer thin films. Finally, a high-resolution OLED pattern of less than 10 μm wide was fabricated by applying the SCP process without any detrimental effects on the device performance. Furthermore, this SCP process was applied to flexible and curved thin films, which verified its potential use for roll-to-roll processes. This study provides a scientific and technological basis for the fabrication of high-resolution patterns of organic electronic devices such as OLEDs.

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Polymeric gate insulators to induce synaptic photoresponse of organic transistors

Kang

Jeong

et al. 2023

J. Korean Phys. Soc.

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Balance of surface energy difference between wetting and dewetting regions for patterning solution-processed organic light-emitting diode

Cited by 5 publications

References 25 publications

Organizing Reliable Polymer Electrode Lines in Flexible Neural Networks via Coffee Ring-Free Micromolding in Capillaries

Organizing Reliable Polymer Electrode Lines in Flexible Neural Networks via Coffee Ring-Free Micromolding in Capillaries

Systematic Investigation of Subtractive Contact Patterning for High-Resolution Organic Electronic Devices

Polymeric gate insulators to induce synaptic photoresponse of organic transistors

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