https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/173 2026-07-24T13:39:07Z 2026-07-24T13:39:07Z Cho, Juhyeong Choi, Minwoo Kim, Ick-Jun Yang, Sunhye Bansal, Neetu Salunkhe, Rahul R. Ahn, Heejoon https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/218427 2026-07-08T11:00:30Z 2026-10-01T00:00:00Z

Title: Sulfonated polydopamine–engineered SWCNT hosts with guided Ag nucleation for stabilized lithium metal anodes Authors: Cho, Juhyeong; Choi, Minwoo; Kim, Ick-Jun; Yang, Sunhye; Bansal, Neetu; Salunkhe, Rahul R.; Ahn, Heejoon Abstract: Lithium metal anodes suffer from unstable Li nucleation, dendritic growth, and interfacial instability. Here, we report a molecularly engineered three-dimensional host composed of sulfonated polydopamine–modified single-walled carbon nanotubes (SPDA@SWCNTs) incorporating Ag nanoparticles. Sulfonation moderates dopamine polymerization, thereby forming a thin, conformal SPDA layer that improves SWCNT dispersion, enhances network uniformity, and increases electrolyte wettability. Catechol/quinone-mediated in situ reduction generates ∼6 nm Ag nanoparticles that assemble into 10–27 nm features and serve as lithiophilic nucleation sites. The resulting Ag@SPDA@SWCNT host exhibits a reduced Li nucleation overpotential (17 mV) and improved Coulombic efficiency (95.9%) in half cells, together with compact Li deposition at an areal capacity of 5 mAh cm−2. In symmetric cells, stable cycling is maintained for over 750 h with a polarization of approximately 15 mV, accompanied by relatively low SEI and charge-transfer resistances. When paired with NCM811 cathodes, the full cell achieves 87.46% capacity retention at 50 cycles and 56.73% after 100 cycles, with an average CE of 98.9%. These results suggest that integrating tailored surface chemistry with lithiophilic nanoparticle incorporation provides an effective approach for improving Li nucleation behavior and interfacial stability in lithium metal anodes.

2026-10-01T00:00:00Z Lee, Yoonsu Oh, Sangkeun Song, Yu-Jin Jang, Ji-un Lee, Joo Hyung Won, Seoyeon Yoo, Joohwan Eom, Youngho Shin, Han-Kyun Zhang, Huanan Zhou, Qian Kim, Shi Hyeong Kim, Jung Han Lim, Taehwan https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/219060 2026-07-10T07:30:38Z 2026-08-01T00:00:00Z

Title: Liquid metal particles enabled ultrahigh isotropic thermal conductivity in soft thermal interface materials for biochips packaging Authors: Lee, Yoonsu; Oh, Sangkeun; Song, Yu-Jin; Jang, Ji-un; Lee, Joo Hyung; Won, Seoyeon; Yoo, Joohwan; Eom, Youngho; Shin, Han-Kyun; Zhang, Huanan; Zhou, Qian; Kim, Shi Hyeong; Kim, Jung Han; Lim, Taehwan Abstract: Semiconductor bioelectronics increasingly integrate on-device AI, the resulting power density however demands thermal interface materials (TIMs) that are simultaneously soft, electrically insulating, thermally conductive, and biocompatible. Conventional epoxy filler TIMs rarely satisfy all of these requirements because of limited biocompatibility, high stiffness, and relatively low through plane heat transport. Here we report a liquid metal particles (LMPs)-based epoxy (LPE) composite in which amine functionalized gallium based LMPs initiate epoxy curing on their own surfaces, forming conformal insulating shells and a controllable nano insulating gap between neighboring LMPs. By treating this shell as excluded volume, we derive a packing with shells model that sets a practical upper limit of approximately 60 vol% for LMPs loading, which we validate by visual measurements. At this optimum, LPE60 reaches nearly isotropic thermal conductivities (7.49 W m−1 K−1 in plane and 4.38 W m−1 K−1 through plane) while maintaining electrical insulation and tissue like softness (Young's modulus 7.96 kPa). LPE60 also shows approximately 100% cell viability at 72 h, less than 10% stress decay after 1000-time tensile cycles, and strong adhesion. Device level tests on an LED module and on a flexible PI heater platform show that LPE60 lowers steady state operating temperatures more effectively than a commercial thermal epoxy and keeps this performance under thermal cycling and bending. These results identify LPE60 as a versatile TIM platform for soft, biocompatible, high-power biochips and flexible semiconductor packaging.

2026-08-01T00:00:00Z Jee, Min Hun Kim, Myeong In Kang, Min Gyu Lee, Sumin Jung, In Hwan Woo, Han Young https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/212893 2026-06-01T00:30:34Z 2026-07-01T00:00:00Z

Title: Recent advances in photodiode-type organic photodetectors: From polymer design to applications Authors: Jee, Min Hun; Kim, Myeong In; Kang, Min Gyu; Lee, Sumin; Jung, In Hwan; Woo, Han Young Abstract: Organic photodetectors (OPDs) offer intrinsic advantages over their inorganic counterparts, including<br /> mechanical flexibility, lightweight and deformable device architectures compatible with wearable and stretchable electionics, and broad tunability of optoelectronic properties enabled by molecular-level de-sign. These feanres position OPDs as versatile and complementary photodetection platforms for both broadband and qolor-selective light sensing. This review presents a focused overview of polymer-based OPDs, with partiqular emphasis on photodiode-type devices based on p-n heterojunction (HJ) and photo-multiplication (PM)-type OPDs, which have experienced especially rapid progress in recent years, achiev-ing substantial improvements in sensitivity, noise characteristics, and response speed. We first summarize the fundamental operating principles and key figures of merit governing both static and dynamic OPD performance. For HJ-type OPDs, recent advances in molecular design strategies enabling visible, near-infrared (NIR), and short-wave infrared (SWIR) photodetection are discussed, with particular attention to polymer modkication approaches that realize color-selective absorption and improved device perfor-mance. We then review recent developments in high-gain PM-type OPDs, focusing on polymer host de-sign and charge-apping modulation strategies for PM. Finally, current challenges and future perspectives for next-generation OPDs are discussed, with an outlook toward their integration into advanced optoelec-<br /> tronic systems. (c) 2026 Elsevier Ltd. All rights are reserved, including those for text and data mining. Al training, and<br /> similar technologies.

2026-07-01T00:00:00Z Jeong, Jinju Park, Sang Wook Kim, Jaehun Lee, Dong Gyu Ahn, Hyungju Lee, Tae Kyung Lee, Seungjin https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/212731 2026-05-18T00:30:30Z 2026-07-01T00:00:00Z

Title: Control over seed framework enables oriented 3D nanocrystalline perovskite films for light-emitting diodes Authors: Jeong, Jinju; Park, Sang Wook; Kim, Jaehun; Lee, Dong Gyu; Ahn, Hyungju; Lee, Tae Kyung; Lee, Seungjin Abstract: Crystallographic features strongly influence the luminescence and charge-transport properties of metal halide perovskite films; however, uncontrolled crystallization remains a major obstacle to developing efficient and stable perovskite light-emitting diodes (PeLEDs). Here we introduce a Lewis acid–base passivation strategy that modulates the formation of initial seed structures during film growth, enabling control over the crystallographic dimensionality, orientation, defect density, and grain size of the resulting films. By systematically investigating ligand-seed interactions, we demonstrate that careful tuning of ligand protophilicity induces additional coordination to the precursor species, thereby stabilizing desired seed configurations and guiding subsequent crystal growth. This strategy yields preferentially oriented and phase-pure three-dimensional (3D) nanocrystalline films while effectively suppressing defect-assisted nonradiative recombination through surface passivation. As a result, the films exhibit a photoluminescence quantum yield of 76%, a hole mobility of 2.22 × 10–4 cm2 V–1 s–1, and a reduced trap density of 3.09 × 1016 cm–3, along with enhanced thermal phase stability at 100 °C. PeLEDs based on these films achieve a maximum external quantum efficiency of 22.1% with minimal efficiency roll-off, maintaining an external quantum efficiency above 20% at 10,000 cd m–2.

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