Kyung Hee University · Engineering
Professor Jin Young Oh's research lab specializes in developing skin-like electronic materials and devices with advanced functionalities such as stretchability, self-healing, biocompatibility, and energy autonomy. The lab focuses on creating bioinspired electronics—particularly electronic skin and wearable sensors—by integrating organic semiconductors, conductive polymers like PEDOT:PSS, and 2D nanomaterials such as transition metal dichalcogenides. Key research directions include stretchable and self-healing optoelectronic synapses, wearable energy harvesters (e.g., thermoelectric generators), and solution-processed, deformable electronic systems for next-generation health monitoring and human-machine interfaces. The lab emphasizes practical, scalable fabrication methods to enable real-world applications in smart healthcare and the Internet of Things.
Figures are computed from collected data and may differ slightly.
Emulation of human sensory and motor functions becomes a core technology in bioinspired electronics for next-generation electronic prosthetics and neurologically inspired robotics. An electronic synapse functionalized with an artificial sensory receptor and an artificial motor unit can be a fundamental element of bioinspired soft electronics. Here, we report an organic optoelectronic sensorimotor synapse that uses an organic optoelectronic synapse and a neuromuscular system based on a stretchabl
PSS) into a solution-processed highly deformable viscoelastic polymer is presented. Rapid self-healing of conductivity, customer-designed LEDs with complex micro-patterns, and foldable stretchable LEDs are demonstrated.
A wearable thermoelectric generator, woven on a wristband, consisting of chemically exfoliated n- and p-type transition metal dichalcogenide nanosheets.
Skin-like sensory devices should be stretchable and self-healable to meet the demands for future electronic skin applications. Despite recent notable advances in skin-inspired electronic materials, it remains challenging to confer these desired functionalities to an active semiconductor. Here, we report a strain-sensitive, stretchable, and autonomously self-healable semiconducting film achieved through blending of a polymer semiconductor and a self-healable elastomer, both of which are dynamical
Electronic second skin is touted as the next interface to expand applications of electronics for natural and seamless interactions with humans to enable smart health care, the Internet of Things, and even to amplify human sensory abilities. Thus, electronic materials are now being actively investigated to construct "second skin." Accordingly, electronic devices are desirable to have skin-like properties such as stretchability, self-healing ability, biocompatibility, and biodegradability. This wo
The use of poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) in electrodes and electrical circuits presents a number of challenges that are yet to be overcome, foremost amongst which are its relatively low conductivity, low coatability on hydrophobic substrates, and decreased conductivity at large strains. With this in mind, this study suggests a simple way to simultaneously address all of these issues through the addition of a small amount of a nonionic surfactant (Triton X-10
In spite of the recent successes in transistors and solar cells utilizing poly(3-hexylthiophene) (P3HT) nanofibrils, systematic analysis on the growth kinetics has not been reported due to the lack of analytical tools. This study proposed a simple spectroscopic method to obtain the crystallinity of P3HT in solutions. On the basis of the analytical approach, we found that the crystallinity hysteresis upon temperature is a simple function of the solubility parameter difference (Delta delta) betwee
A desirable vertical phase separation of a bulk-heterojunction was achieved by inserting a P3HT layer between the blend layer and the poly(3,4-ethylenedioxythiophene) poly(styrenesulfonate) (PEDOT:PSS) layer. According to the high (PEDOT:PSS) and low (P3HT) surface energies of substrate, it might be possible to modulate the vertical phase separation in the bulk-heterojunction. The result of vertical phase separation was determined using time-of-flight secondary-ion mass spectroscopy analysis. A
Applying conventional printing technologies to fabricate large-area flexible bulk heterojunction (BHJ) solar cells is of great interest. Achieving this task requires (i) large tolerance of the maximum photoconversion efficiency (PCE) to the film thickness, (ii) fast hole transport in both the thickness and lateral directions of the BHJ layer, and (iii) improved stability against bending and heat. This paper demonstrates that a P3HT:PCBM BHJ layer made of long P3HT nanofibrils of almost 100% crys
In spite of the rapid increase in the power conversion efficiency (PCE) of polymer solar cells (PSCs), the poor stability of the photoactive layer in air under sunlight is a critical problem blocking commercialization of PSCs. This study investigates the photo-oxidation behavior of a bulk-heterojunction (BHJ) photoactive film made of single-crystalline poly(3-hexlythiophene) (P3HT) nanofibrils and fullerene derivatives [phenyl-C61-butyric methyl ester (PCBM), indene-C 60 bisadduct (ICBA)]. Becau
Abstract Stretchable wearable sensors ultimately require low power consumption and high response to physiological signals with skin conformability. However, power‐response tradeoff and strain‐dependent sensing instability remain key challenges for electronic skin (e‐skin) sensors. Herein,an intrinsically stretchable organic subthreshold transistor operating at low voltage (−1 V) is presented, leading to ultralow power consumption (<1 nW) for highly sensitive skin‐like temperature sensory devi
Wearable power sources should be stretchable to provide continuous electricity to devices. In spite of significant progress in the field of wearable electronics, the development of stretchable power sources is still challenging. In this study, we developed a high-performance stretchable thermoelectric generator using multi-dimensional nanocomposites. The thermoelectric power of the metal dichalcogenide (TMD) nanosheet-based active film was significantly enhanced by adding highly conducting singl
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