Seoul National University · Engineering
Professor In-Suk Choi's research lab specializes in the development of stretchable and flexible electronic systems with a focus on mechanical reliability and electrical performance under dynamic deformation. The lab pioneers innovative material design and structural engineering strategies—such as patterned substrates, nanohole integration, and computational wrapping techniques—to enable conformal electronics on complex curved surfaces and to enhance the fatigue resistance of electrodes and batteries. Their work bridges materials science, mechanical engineering, and device physics, emphasizing intrinsic material compatibility and geometric design for next-generation wearable and implantable electronics.
Figures are computed from collected data and may differ slightly.
Abstract It remains a fundamental challenge in the development of stretchable electronics to understand how mechanical strain changes the electrical properties of materials. Although the piezoresistive behavior of poly(3,4‐ethylene‐ dioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) has been observed, its intrinsic origin is not yet fully understood because there are many extrinsic contributing factors and an experimental platform with which to assess such behavior has not been established. Here
This study starts from the counterintuitive question of how we can render conventional stiff, nonstretchable, and even brittle materials sufficiently conformable to fully wrap curved surfaces, such as spheres, without failure. Here, we extend the geometrical design method of computational origami to wrapping. Our computational wrapping approach provides a robust and reliable method for fabricating conformal devices for arbitrary curved surfaces with a computationally designed nonpolyhedral devel
Design and fabrication of reliable electrodes is one of the most important challenges in flexible devices, which undergo repeated deformation. In conventional approaches, mechanical and electrical properties of continuous metal films degrade gradually because of the fatigue damage. The designed incorporation of nanoholes into Cu electrodes can enhance the reliability. In this study, the electrode shows extremely low electrical resistance change during bending fatigue because the nanoholes suppre
A direct integration scheme for a Li-ion battery on a polymer substrate is successfully implemented. As a proof of concept, the bendable Li-ion battery is fabricated using a nano-hairy Si anode, which exhibits a much longer cycle life and a higher capacity on various C-rates compared to a Si thin film electrode on a pristine PI. In the cyclic bending test, with a bending radius of 16 mm, over 3000 cycles are measured without a voltage drop. As a service to our authors and readers, this journal p
A rugged lithium‐ion battery (LIB) can be realized without any new material development through selective material matching based on localized deformation of a substrate induced by its well‐designed pattern. In particular, an auxetic cut flexible substrate accommodates various complex deformations and adaptive conformations through the hinge joints because the external force is highly localized in the hinges while the segmented motifs remain almost undeformed. The embedded LIB cells in undeforme
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