Article
Nanoscience & Nanotechnology
Shubing Li, Ming Li, Li Chen, Xionghu Xu, Anyang Cui, Xin Zhou, Kai Jiang, Liyan Shang, Yawei Li, Jinzhong Zhang, Liangqing Zhu, Zhigao Hu, Junhao Chu
Summary: Flexible memory and wearable electronics based on the STSe phase change material exhibit excellent thermal stability, mechanical reliability, and performance. The STSe-based phase change memory shows remarkable reversible phase change ability and the flexible device can monitor and respond to human activities, demonstrating its reusability and potential as wearable electronics. The STSe device also shows outstanding working reliability, with durability over 100 seconds and long retention over 100 hours.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Chemistry, Multidisciplinary
Weigao Sun, Lingfei Ji, Zhenyuan Lin, Jincan Zheng, Zhiyong Wang, Litian Zhang, Tianyang Yan
Summary: In this research, a one-step laser lift-off (LLO) process for patterned gallium nitride (GaN) film and GaN-based light-emitting diode (LED) device was achieved using 355 nm picosecond laser irradiation. The required laser fluence for separation was much lower than that of current LLO methods. The separated GaN film showed minimal residual stress and had an ultra-smooth surface. The technique ensured the flexibility of the separated LED device without affecting its performance. This research provides a promising strategy for the industrial fabrication of flexible GaN-based electronics, achieving low energy consumption, high controllability, and high efficiency.
ADVANCED FUNCTIONAL MATERIALS
(2022)
Article
Materials Science, Multidisciplinary
Dongliang Guo, Jinghui Ling, Yizhuo Huang, Wennan Xiong, Yixuan Xu, Yunzhao Bai, Kan Li, Fan Zhang, YongAn Huang
Summary: This study presents a strategy of recrystallization-induced laser lift-off to overcome the challenge of high-temperature annealing in metal-based flexible thermal sensors on polymer substrates. The approach effectively reduces manufacturing defects and improves the sensitivity of the sensors. It provides valuable insights into the modulation of interface adhesion and the detachment of the sensor, opening a new route for fabricating high-temperature annealed sensors on flexible substrates.
ADVANCED MATERIALS TECHNOLOGIES
(2023)
Article
Multidisciplinary Sciences
Jingon Jang, Seonghoon Jang, Sanghyeon Choi, Gunuk Wang
Summary: By implementing additional filter evaluation and a simple run-off election-based decision rule in artificial neural network systems, confusion is reduced and training and inference performance is improved, leading to increased classification accuracy of the data set.
SCIENTIFIC REPORTS
(2021)
Article
Engineering, Electrical & Electronic
Rajkumar Dey, Shamima Hussain, A. K. Pal
Summary: Cellulose nano-fibers were used to fabricate a flexible paper and a simple Ag/CdS/Au Schottky diode was successfully created on it. Characterization and testing were conducted to evaluate the quality of the diode.
MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
(2022)
Article
Chemistry, Physical
Qinghua Zhao, Peng Chen, Dan Zheng, Tao Wang, Andres Castellanos-Gomez, Riccardo Frisenda
Summary: This study demonstrates a multifunctional device based on the van der Waals semiconductor Indium Selenide (InSe), which can function as a high-quality Schottky diode and a memory. By depositing the InSe channel onto graphite and platinum electrodes and implementing air passivation treatment, the device exhibits adjustable Schottky barrier height and photovoltaic parameters. This multifunctional behavior is attributed to trap state modulation.
Article
Chemistry, Multidisciplinary
Ruizhe Yang, Matthew Benner, Zipeng Guo, Chi Zhou, Jun Liu
Summary: Dynamic Schottky direct-current (DC) generators show great potential for energy harvesting, but the lack of understanding of DC generation in conducting polymer-based generators has hindered their applications. A high-performance, flexible Schottky DC generator demonstrated large current density and scaled-up DC output, inheriting flexibility from the long-chain polymer concept and showing promise for next-generation wearable devices.
ADVANCED FUNCTIONAL MATERIALS
(2021)
Review
Materials Science, Multidisciplinary
Fangcheng Wang, Qiang Liu, Jianwen Xia, Mingqi Huang, Xuefan Wang, Wenxue Dai, Guoping Zhang, Daquan Yu, Jinhui Li, Rong Sun
Summary: This article mainly discusses the application and challenges of laser lift-off (LLO) technology in ultra-thin electronic devices. By elaborating the laser-material interactions and related effects, it explores the latest progress of LLO technology in fields such as wafer level packaging, displays, energy harvesters, sensors, and memories.
ADVANCED MATERIALS TECHNOLOGIES
(2023)
Article
Engineering, Electrical & Electronic
Qi Wei, Feng Zhou, Weizong Xu, Fangfang Ren, Dong Zhou, Dunjun Chen, Rong Zhang, Youdou Zheng, Hai Lu
Summary: In this study, crack-free GaN films were successfully transferred from sapphire substrate to conductive silicon wafer using eutectic bonding and laser lift-off techniques. The resulting GaN Schottky barrier diodes exhibited high performance and excellent electrothermal ruggedness, demonstrating great potential for high-power and high-efficiency applications.
IEEE JOURNAL OF THE ELECTRON DEVICES SOCIETY
(2022)
Article
Chemistry, Physical
Hongcheng Xu, Weihao Zheng, Yuejiao Wang, Dandan Xu, Ningjuan Zhao, Yuxin Qin, Yangbo Yuan, Zhengjie Fan, Xueli Nan, Qikai Duan, Weidong Wang, Yang Lu, Libo Gao
Summary: This study developed an integrated sensor patch (ISP) that can sense both strain and pressure, and is insensitive to off-axis deformations. The patch has independent tensile strain and out-of-plane pressure sensing capabilities, making it suitable for applications in human-machine interfaces and virtual reality.
Article
Multidisciplinary Sciences
Rohit Abraham John, Nimesh Shah, Sujaya Kumar Vishwanath, Si En Ng, Benny Febriansyah, Metikoti Jagadeeswararao, Chip-Hong Chang, Arindam Basu, Nripan Mathews
Summary: The study explores the use of one-dimensional halide perovskite memristors to design security primitives for key generation and device authentication, offering a new solution to the challenge of efficient roots of trust for resource-constrained hardware.
NATURE COMMUNICATIONS
(2021)
Article
Chemistry, Multidisciplinary
Namju Kim, Seung-Bae Jeon, Byung Chul Jang
Summary: With the advancement of IoT, security concerns are growing due to the increased number of connected devices. Hardware intrinsic PUFs, which exploit inherent randomness, are a potential solution for security issues. However, achieving low power consumption in PUFs remains a challenge.
Article
Materials Science, Ceramics
Lisha Liu, Yuanyuan Cai, Xin Chen, Zhen Liu, Guoliang Yuan, Yaojin Wang
Summary: With the explosion of information data, there has been a rapid surge in the research of nonvolatile memory. This work proposes an unprecedented flexible multi-state data storage strategy based on antiferroelectric film, which shows exceptional durability and flexibility. These findings provide new pathways for the development of the next-generation multi-state memory in smart wearable devices or flexible display screens.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2022)
Article
Engineering, Electrical & Electronic
Adam M. Weidling, Vikram S. Turkani, Vahid Akhavan, Kurt A. Schroder, Sarah L. Swisher
Summary: The photonic lift-off (PLO) process can rapidly separate polymer films from rigid carriers, enabling the fabrication of flexible electronics.
NPJ FLEXIBLE ELECTRONICS
(2022)
Article
Chemistry, Multidisciplinary
Yongxu Hu, Lei Zheng, Jie Li, Yinan Huang, Zhongwu Wang, Xueying Lu, Li Yu, Shuguang Wang, Yajing Sun, Shuaishuai Ding, Deyang Ji, Yong Lei, Xiaosong Chen, Liqiang Li, Wenping Hu
Summary: Researchers have synthesized a phase-changeable and high-mobility organic semiconductor that can reversibly modulate its molecular conformation using an electric field and ultraviolet irradiation. Based on the distinct charge transport properties resulting from slight differences in molecular conformation, a high-performance organic phase-change memory transistor has been constructed. This work presents a new molecule design concept for organic semiconductors and opens a path for memory devices and other functional applications.
Article
Engineering, Biomedical
Jae Hee Lee, Yuri Ahn, Han Eol Lee, You Na Jang, A. Yeon Park, Shinho Kim, Young Hoon Jung, Sang Hyun Sung, Jung Ho Shin, Seung Hyung Lee, Sang Hyun Park, Ki Soo Kim, Min Seok Jang, Beom Joon Kim, Sang Ho Oh, Keon Jae Lee
Summary: A wearable surface-lighting micro-LED (S mu LED) photostimulator is reported for skin care and cosmetic applications. The S mu LEDs maximize photostimulation effectiveness on the skin surface by uniform irradiation, high flexibility, and thermal stability, and its anti-melanogenic effect is confirmed through experiments.
ADVANCED HEALTHCARE MATERIALS
(2023)
Article
Multidisciplinary Sciences
Jiho Shin, Hyunseok Kim, Suresh Sundaram, Junseok Jeong, Bo-In Park, Celesta S. Chang, Joonghoon Choi, Taemin Kim, Mayuran Saravanapavanantham, Kuangye Lu, Sungkyu Kim, Jun Min Suh, Ki Seok Kim, Min-Kyu Song, Yunpeng Liu, Kuan Qiao, Jae Hwan Kim, Yeongin Kim, Ji-Hoon Kang, Jekyung Kim, Doeon Lee, Jaeyong Lee, Justin S. Kim, Han Eol Lee, Hanwool Yeon, Hyun S. Kum, Sang-Hoon Bae, Vladimir Bulovic, Ki Jun Yu, Kyusang Lee, Kwanghun Chung, Young Joon Hong, Abdallah Ougazzaden, Jeehwan Kim
Summary: Researchers have developed a full-color, vertically stacked micro-LED (mu LED) with the highest array density and smallest size reported so far. This was achieved using a two-dimensional materials-based layer transfer technique, enabling the growth of RGB LEDs with submicron thickness on two-dimensional material-coated substrates, followed by stacking and top-down fabrication. This technology not only opens up new possibilities for full-color mu LED displays in augmented and virtual reality applications, but also provides a generalizable platform for other three-dimensional integrated devices.
Article
Nanoscience & Nanotechnology
Upendra Kumar, Vipin Kumar, Ajay Kumar Kushwaha, Sung Beom Cho
Summary: This study investigates the behavior of bulk and surface state of topological insulators under a high frequency electromagnetic field, revealing the presence of Floquet oscillation. The Floquet approximation is validated through numerical simulation.
PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES
(2023)
Article
Chemistry, Physical
Hyunseok Song, Jongmoon Jang, Mahesh Peddigari, Srinivas Pattipaka, Yuho Min, Kwi-Il Park, Chang Kyu Jeong, Han Eol Lee, Jung Hwan Park, Ho-Yong Lee, Woon-Ha Yoon, Jungho Ryu, Geon-Tae Hwang
Summary: In this study, Pb(Mg1/3Nb2/3)O-3-Pb(Zr,Ti)O-3 (PMN-PZT) single crystals doped with hardener Mn were used to develop a high-output magneto-mechano-electric (MME) generator. By doping with 0 to 0.8 mol% hardener Mn, the dielectric constant and dielectric loss of the PMN-PZT crystal gradually decreased. The Mn-modified MME device achieved an improved magnetoelectric coefficient of 783.09 V per cm center dot Oe and a root mean square output power of 3.3 mW when an alternating current magnetic field of 8 Oe was applied, which is 1.8 times higher than that of the MME generator without Mn-doping.
JOURNAL OF MATERIALS CHEMISTRY A
(2023)
Article
Materials Science, Multidisciplinary
Tengfei Cao, Guodong Ren, Ding -Fu Shao, Evgeny Y. Tsymbal, Rohan Mishra
Summary: The recent observation of ferroelectricity in binary metal oxides, such as HfO2, ZrO2, Hf0.5Zr0.5O2, and Ga2O3, has attracted much attention. Hole doping is proposed to play a key role in stabilizing polar phases in these oxides. First-principles calculations demonstrate that holes mainly occupy one of the oxygen sublattices and their localization enhances the electrostatic energy of the system, making the polar phase more stable at high concentrations. The electrostatic mechanism is responsible for the stabilization of the ferroelectric phase in HfO2 doped with elements that introduce holes to the system.
PHYSICAL REVIEW MATERIALS
(2023)
Review
Nanoscience & Nanotechnology
Ilpyo Roh, Seok Hyeon Goh, Yuan Meng, Justin S. Kim, Sangmoon Han, Zhihao Xu, Han Eol Lee, Yeongin Kim, Sang-Hoon Bae
Summary: Epitaxy technology has limitations due to lattice matching constraints, but emerging techniques such as remote and van der Waals epitaxy offer potential solutions for creating freestanding nanomembranes. This review article provides an overview of the mechanisms and fundamentals of van der Waals and remote epitaxy, highlighting the unique advantages of these growth strategies. Original applications and the limitations of current techniques are discussed, along with possible solutions and future directions for nanomembrane-based advanced heterogeneous integration.
Article
Chemistry, Physical
TaeHyun Hong, Hyeon Woo Kim, Yoon-Seo Kim, Hyun-Jun Jeong, Sung Beom Cho, Jin-Seong Park
Summary: In this study, a computational workflow based on DFT was used to design metastable materials, and PEALD was found to be a profitable method for synthesizing the target material. The CAH-IZO material, with its superior electrical properties, was identified as a promising candidate for thin-film transistor (TFT) applications.
CHEMISTRY OF MATERIALS
(2023)
Article
Chemistry, Physical
Min Sung Kang, Hyunseok Ko, Seokhee Lee, Sung Beom Cho
Summary: Hydrovoltaic is a promising energy harvesting technology that generates energy through the direct interaction of water and material. The distribution of ions plays a key role in improving the voltage output, with a higher gradient of ions' concentration leading to stronger potential differences. The presence of salt ions significantly affects the electrical performance, making it highly sensitive to substrate porosity but less sensitive to relative humidity.
JOURNAL OF PHYSICAL CHEMISTRY C
(2023)
Article
Chemistry, Physical
Hyunsu Choi, Srinivas Pattipaka, Yong Hoon Son, Young Min Bae, Jung Hwan Park, Chang Kyu Jeong, Han Eol Lee, Sung-Dae Kim, Jungho Ryu, Geon-Tae Hwang
Summary: In this study, the structural, microstructural, dielectric, and energy storage properties of Nd and Mn co-doped Ba0.7Sr0.3TiO3 ceramics were investigated. The defect dipole engineering method was used to enhance the breakdown electric field and energy storage performances. The results showed that the complex defect dipoles improved the domain formation energy and domain wall energy, leading to high energy storage density and efficiency.
Article
Nanoscience & Nanotechnology
Giulio Fatti, Alessandra Ciniero, Hyunseok Ko, Han Uk Lee, Yujin Na, Chang Kyu Jeong, Sang-Geul Lee, Dongyub Kwak, Kwi-Il Park, Sung Beom Cho, Daniele Dini
Summary: The lack of theoretical understanding of triboelectrification has hindered the development of energy harvesting technologies like triboelectric nanogenerators. A model predictive of the triboelectric behavior of polytetrafluoroethylene is formulated, driving the development of improved nanogenerators. By using a combined computational-experimental approach, it is shown that defluorination enhances the triboelectric charging of polytetrafluoroethylene at the nanoscale, leading to a one-order-of-magnitude output increase in triboelectric nanogenerators.
ADVANCED ELECTRONIC MATERIALS
(2023)
Article
Nanoscience & Nanotechnology
Jeong Hyeon Kim, Daniel J. Joe, Han Eol Lee
Summary: Human-machine interface is a significant technology in smart applications, enabling direct communication between humans and machines. Wearable electronic skins, particularly those with a free form factor, have gained attention for their excellent adherence to rough and wrinkled surfaces like human skin and organs. However, existing e-skins often have drawbacks in terms of mechanical instability and accumulation of by-products at the human-device interface. This study presents a mechanically stable e-skin with a unique eye pattern, which effectively dissipates mechanical stress and strain. The e-skin also demonstrates superior permeability to sweat and real-time monitoring of body temperature.
MICRO AND NANO SYSTEMS LETTERS
(2023)
Article
Materials Science, Multidisciplinary
Han Eol Lee, Chang Kyu Jeong
Summary: A new inorganic-based laser lift-off (ILLO) process using a BaTiO3 (BTO) sacrificial layer was developed for producing flexible thin-film micro-light-emitting diodes (mu LEDs). The process was optimized through theoretical simulations and experiments, including laser conditions and carrier substrate types. The successful application of the BTO sacrificial layer in the ILLO process was confirmed by material analyses. Vertically structured flexible mu LEDs were successfully fabricated using BTO-based delamination, demonstrating the potential of this method for next-generation electronics.
MRS COMMUNICATIONS
(2023)
Article
Multidisciplinary Sciences
Xin Li, Yu Yun, Arashdeep Singh Thind, Yuewei Yin, Qiang Li, Wenbin Wang, Alpha T. N'Diaye, Corbyn Mellinger, Xuanyuan Jiang, Rohan Mishra, Xiaoshan Xu
Summary: This study investigates the electrical modulation of magnetic states in single-phase multiferroic materials using domain-wall magnetoelectric (ME) coupling. Results show that the domain-wall ME effect is dramatically enhanced when the separation between ferroelectric (FE) domain walls shrinks below the characteristic width of the antiferromagnetic (AFM) domain walls. These findings suggest that the domain-wall ME effect is capable of electrical control of magnetization.
SCIENTIFIC REPORTS
(2023)
Article
Chemistry, Physical
Sungyoon Jung, Tengfei Cao, Rohan Mishra, Pratim Biswas
Summary: This study investigates the effect of CO2 concentration in the feed stream on CH4 oxidation in oxy-combustion systems. Experimental results show that an increase in CO2 concentration leads to a higher rate of CO2 generation and complete CH4 oxidation. Theoretical calculations suggest that a high surface coverage of CO2 on Pd reduces the activation energy for CH4 dissociation and subsequent oxidation reactions. These findings indicate the beneficial role of a CO2-rich environment in reducing oxygen content in exhaust gases.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2023)
Article
Multidisciplinary Sciences
Sang Hyun Park, Tae Jin Kim, Han Eol Lee, Boo Soo Ma, Myoung Song, Min Seo Kim, Jung Ho Shin, Seung Hyung Lee, Jae Hee Lee, Young Bin Kim, Ki Yun Nam, Hong-Jin Park, Taek-Soo Kim, Keon Jae Lee
Summary: The micro-vacuum assisted selective transfer is a promising method for assembling micro-sized inorganic semiconductors onto unconventional substrates, offering ultrahigh adhesion switchability and without the need for additional adhesives or chip damage.
NATURE COMMUNICATIONS
(2023)