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JKSPE : Journal of the Korean Society for Precision Engineering

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Optimization of Electrode Interface Control Process of Soft Electronic Devices for Low Energy Consumption
Seojin Moon, Taeheon Kim, Minkyu Park, Hyunseok Shim
J. Korean Soc. Precis. Eng. 2026;43(2):175-181.
Published online February 1, 2026
DOI: https://doi.org/10.7736/JKSPE.025.104
In this study, we demonstrate a well-established strategy for controlling the threshold voltage (Vth) in organic thin-film transistors (OTFTs) by applying uniform gold nanoparticle (AuNP) coatings onto silver nanowire (AgNW) electrodes using a galvanic replacement process in the presence of NaCl. This approach highlights the potential for low-energy consumption operation. The AuNP coatings effectively adjust the work function of the AgNW electrodes to better match that of the organic semiconductor. As a result, the OTFT devices show significantly reduced threshold voltages, enhancing charge injection efficiency and lowering the operating voltage. Additionally, when used as synaptic transistors, the optimized Aucoated AgNW composite electrodes demonstrate superior neuromorphic performance, including a lower maximum drain voltage (VDS), indicating a potential for improved energy efficiency per spike event. This advancement marks a critical step toward developing low-power neuromorphic devices and low-voltage flexible electronics. Our work establishes a practical methodology for quantitatively and reproducibly controlling Vth through precise modulation of metal coating uniformity, providing a solid technological foundation for future optimization of organic electronic devices.
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Emerging Patterning Strategies for Intrinsically Stretchable Conductors: Materials, Architectures, and Device-level Performance
Donghyeon Seo, Seongsik Jeong, Hae-Jin Kim
J. Korean Soc. Precis. Eng. 2025;42(10):789-816.
Published online October 1, 2025
DOI: https://doi.org/10.7736/JKSPE.D.25.00003

Intrinsically stretchable electronics enable seamless integration with dynamic biological tissues and curved surfaces, making them vital for next-generation wearables, biointerfaces, and intelligent robotics. Yet, precise, high-resolution patterning of stretchable electrodes and circuits remains challenging, limiting practical applications. Traditional lithography offers excellent resolution but is hindered by thermal and chemical incompatibilities with soft substrates. Consequently, alternative approaches such as soft lithography, laser-based patterning, printing methods, and electrospray deposition have gained importance. Soft lithography provides an economical, low-temperature option suitable for delicate materials like liquid metals. Laser-based techniques deliver high resolution and design flexibility but require careful parameter tuning for specific substrates. Mask-free printing methods, including direct ink writing and inkjet printing, enable versatile patterning of complex geometries, while electrospray deposition supports precise, non-contact patterning on stretchable surfaces. Collectively, these techniques advance the fabrication of robust stretchable displays, wireless antennas, and bioelectronic interfaces for accurate physiological monitoring. Despite progress, challenges persist, particularly in achieving large-area uniformity, multilayer stability, and sustainable processing. Addressing these issues demands interdisciplinary collaboration across materials science, fluid dynamics, interfacial engineering, and digital manufacturing. This review highlights recent progress and remaining hurdles, offering guidance for future research in stretchable electronics.

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