Article
Engineering, Electrical & Electronic
Peian Li, Xu Zhang, Wing Cheung Chong, Kei May Lau
Summary: A monolithic thin film red LED micro-display driven by a CMOS driver has been successfully fabricated, delivering high brightness and image quality. This work also lays the foundation for hybrid integration with blue/green LEDs to achieve full-color LED micro-displays.
IEEE PHOTONICS TECHNOLOGY LETTERS
(2021)
Article
Optics
Longheng Qi, Peian Li, Xu Zhang, Ka Ming Wong, Kei May Lau
Summary: A prototype of full-color micro-LED micro-display with a pixel density of 391 ppi is demonstrated using InGaN/AlGaInP heterogeneous integration. This display shows the feasibility and prospects of high brightness, good color performance, and high-resolution micro-LED micro-displays in future metaverse applications.
LIGHT-SCIENCE & APPLICATIONS
(2023)
Article
Engineering, Electrical & Electronic
Xu Zhang, Longheng Qi, Wing Cheung Chong, Peian Li, Chak Wah Tang, Kei May Lau
Summary: An active matrix monolithic micro-LED full-color micro-display with a pixel density of 317 ppi is demonstrated, fabricated from large-scale and low-cost GaN-on-Si epilayers. The monolithic 64 x 36 blue micro-LED arrays are transformed into full-color micro-displays by applying a photo-patternable color conversion layer, showing feasible manufacturability and potential for volume production.
JOURNAL OF THE SOCIETY FOR INFORMATION DISPLAY
(2021)
Article
Engineering, Electrical & Electronic
Xiaoxiao Ji, Fei Wang, Haojie Zhou, Kefeng Wang, Luqiao Yin, Jianhua Zhang
Summary: With the development of display technology and high-speed communication, augmented reality (AR) and virtual reality (VR) have become emerging display platforms for human-machine interactions. This article presents the design and fabrication of a 0.39-inch 1024 x 768 blue and green active-matrix Micro-LED display with a pixel size of 5.5 μm and a pixel pitch of 7.5 μm. The blue and green Micro-LED displays demonstrate excellent electrical and optical characteristics, including low forward voltage and high brightness. The control of PWM frame generated by the FPGA board allows vivid display of 8-bit grayscale images and videos. This method is expected to pave the way for high-performance Micro-LED displays for AR and smart glasses.
IEEE TRANSACTIONS ON ELECTRON DEVICES
(2023)
Article
Materials Science, Multidisciplinary
Chanju Park, Junyeong Kim, Heonbang Lee, Junmi Lee, Md Mobaidul Islam, Hansol Jeong, Jin Jang
Summary: This study presents a biaxially stretchable AM micro-LED display with liquid metal interconnects. The display can operate both in relaxed and stretched states up to 24%, and successfully displays characters A, D, R, and C through AM driving.
ADVANCED MATERIALS TECHNOLOGIES
(2023)
Article
Chemistry, Multidisciplinary
Ayush Pandey, Jungwook Min, Maddaka Reddeppa, Yakshita Malhotra, Yixin Xiao, Yuanpeng Wu, Kai Sun, Zetian Mi
Summary: By developing nanowire excitonic LEDs, the challenge of reduced efficiency in quantum well LEDs at small dimensions can be overcome. A submicron scale green-emitting LED with an external quantum efficiency of 25.2% and a wall-plug efficiency of 20.7% was achieved, the highest values reported for LEDs of this size to our knowledge. Critical factors for achieving excitonic micro-LEDs were identified, including epitaxy of nanostructures for strain relaxation, utilization of semipolar planes to minimize polarization effects, and formation of nanoscale quantum confinement to enhance electron-hole wave function overlap. This work provides a viable path to break the efficiency bottleneck of nanoscale optoelectronics.
Article
Chemistry, Multidisciplinary
Matthew B. Donnelly, Joris G. Keizer, Yousun Chung, Michelle Y. Simmons
Summary: The study demonstrates the tunability of tunnel junction conductance in Si:P by using vertically separated top-gates and introduces a monolithic 3D epitaxial top-gate technology that increases capacitive coupling, allowing tunability of tunnel barrier height. By combining multiple gated junctions in series, the technology is extended to implement nanoscale logic circuits including AND and OR gates.
Review
Optics
Abdur Rehman Anwar, Muhammad T. Sajjad, Muhammad Ali Johar, Carlos A. Hernandez-Gutierrez, Muhammad Usman, S. P. Lepkowski
Summary: The demand for high-performance displays is increasing due to their wide applications. Micro-LED display shows potential to replace traditional displays, but faces challenges in mass transfer and manufacturing cost. Another option is using color conversion medium for full-color display.
LASER & PHOTONICS REVIEWS
(2022)
Review
Crystallography
Shenghao Zhang, Hua Zheng, Lv Zhou, Huadan Li, Yuanrui Chen, Chenchen Wei, Tao Wu, Wei Lv, Geng Zhang, Shaoqiang Zhang, Zheng Gong, Baohua Jia, Han Lin, Zhiwen Gao, Wei Xu, Honglong Ning
Summary: This paper discusses the key technologies involved in Micro-LED display technology, including chip technology, mass transfer, full-color display, bonding, and driving technology. It emphasizes the wavelength uniformity, current density, and defect control for chip epitaxy technology, and discusses the challenges brought by miniaturization for chip process. It also summarizes several mainstream technical schemes for chip integration, full-color display, backplane bonding, and driving. Finally, it introduces chip detection and repair technologies and commercial applications.
Article
Chemistry, Multidisciplinary
Jaehyung Yu, Ce Liang, Myungjae Lee, Soumik Das, Andrew Ye, Fauzia Mujid, Preeti K. Poddar, Baorui Cheng, Nicholas L. Abbott, Jiwoong Park
Summary: This study reports a method for the fabrication and dynamical imaging of freely floating MoS2 solids on water, minimizing extrinsic interactions between the solid and water. By introducing photoswitchable surfactants, spatial and temporal control of the floating MoS2 is achieved, demonstrating a variety of reversible shape changes in two-dimensional mechanical systems.
Article
Multidisciplinary Sciences
Yue Shi, Takaaki Taniguchi, Ki-Nam Byun, Daiki Kurimoto, Eisuke Yamamoto, Makoto Kobayashi, Kazuhito Tsukagoshi, Minoru Osada
Summary: In this study, a method for manufacturing 2D material devices using LED lithography is introduced. The advantage of this method lies in its mild photolithography process, which combines an optical microscope and a LED projector. This method offers maskless, damage-free photolithography, particularly suitable for 2D materials that are sensitive to conventional lithography.
SCIENTIFIC REPORTS
(2023)
Article
Computer Science, Hardware & Architecture
Daeun Park, Younghoon Jeong, YoungSu Moon, YungKyung Park
Summary: This study compares a high-dynamic range (HDR) micro LED display with a low-luminance LCD to determine the relationship between HDR and image quality evaluation factors. The experiments were conducted with general consumers using a Micro LED 4K (110 in.) and an LCD 8K (85 in.). The Micro LED display showed enhanced texture analysis and clear image quality, especially for microscopic images. Increased vividness due to Micro LED's color gamut extension significantly impacted the evaluation of image details. HDR was found to be an important factor comparable to the high resolution of the 8K display, and Micro LED exhibited the widest HDR among commercialized displays, promising clear, high-quality images.
Article
Nanoscience & Nanotechnology
Sumin Hwangbo, Luhing Hu, Anh Tuan Hoang, Jae Yong Choi, Jong-Hyun Ahn
Summary: This paper presents a novel fabrication method for the integration of transition metal dichalcogenides with compound semiconductors, which is compatible with a batch microfabrication process. The authors demonstrate the synthesis of a thin film of molybdenum disulfide on a gallium-nitride-based epitaxial wafer, which is then used to form a thin film transistor array. This transistor array is subsequently integrated with micro-light-emitting-diode devices to create an active matrix micro-LED display. The authors also show a simple approach for obtaining red and green colors through the printing of quantum dots on a blue micro-LED, enabling the scalable fabrication of full-color micro-LED displays.
NATURE NANOTECHNOLOGY
(2022)
Article
Multidisciplinary Sciences
Lutao Li, Junjie Yao, Juntong Zhu, Yuan Chen, Chen Wang, Zhicheng Zhou, Guoxiang Zhao, Sihan Zhang, Ruonan Wang, Jiating Li, Xiangyi Wang, Zheng Lu, Lingbo Xiao, Qiang Zhang, Guifu Zou
Summary: A colloid-driven low supersaturation crystallization strategy is used to successfully grow atomically thin Cs3Bi2Br9. This approach leverages the colloid solution to induce initial heterogeneous nucleation in a low-concentration supersaturation state. The results demonstrate the growth of atomically thin Cs3Bi2Br9 from monolayered to six-layered structures. This work provides a novel method for growing halide perovskite crystals with non-van der Waals structures and shows potential applications for atomically thin single crystal growth with strong electronic coupling between adjacent layers.
NATURE COMMUNICATIONS
(2023)
Article
Physics, Multidisciplinary
John Cenker, Bevin Huang, Nishchay Suri, Pearl Thijssen, Aaron Miller, Tiancheng Song, Takashi Taniguchi, Kenji Watanabe, Michael A. McGuire, Di Xiao, Xiaodong Xu
Summary: In this study, two-dimensional magnons were directly observed in atomically thin CrI3 using magneto-Raman spectroscopy, revealing optical selection rules and magnetic properties. The phonon magnon mode in monolayers exhibited strict selection rules, while the optical magnon modes in bilayers and bulk materials were influenced by layer index. Additionally, two degenerate optical magnon modes with opposite angular momentum and conjugate optical selection rules were resolved in layered antiferromagnetic states.
Article
Multidisciplinary Sciences
Weisheng Li, Xiaoshu Gong, Zhihao Yu, Liang Ma, Wenjie Sun, Si Gao, Cagil Koroglu, Wenfeng Wang, Lei Liu, Taotao Li, Hongkai Ning, Dongxu Fan, Yifei Xu, Xuecou Tu, Tao Xu, Litao Sun, Wenhui Wang, Junpeng Lu, Zhenhua Ni, Jia Li, Xidong Duan, Peng Wang, Yuefeng Nie, Hao Qiu, Yi Shi, Eric Pop, Jinlan Wang, Xinran Wang
Summary: By hybridizing with semi-metallic antimony (0112) through strong van der Waals interactions, the electrical contact of monolayer molybdenum disulfide is improved, meeting the requirements for the development of next-generation electronics.
Article
Nanoscience & Nanotechnology
Hongkai Ning, Zhihao Yu, Qingtian Zhang, Hengdi Wen, Bin Gao, Yun Mao, Yuankun Li, Ying Zhou, Yue Zhou, Jiewei Chen, Lei Liu, Wenfeng Wang, Taotao Li, Yating Li, Wanqing Meng, Weisheng Li, Yun Li, Hao Qiu, Yi Shi, Yang Chai, Huaqiang Wu, Xinran Wang
Summary: A duplex device structure based on a ferroelectric field-effect transistor and an atomically thin MoS2 channel was developed, enabling a universal in-memory computing architecture for in situ learning. The device exhibited excellent performance in endurance, retention, speed, and energy consumption. It can be integrated with silicon circuitry to provide a hardware solution for general edge intelligence.
NATURE NANOTECHNOLOGY
(2023)
Review
Instruments & Instrumentation
Wei Li, Dabing Li, Lipeng He, Yage Wang, De Wang, Lu Qiao
Summary: Valve-less piezoelectric pumps have been widely applied in fields such as fuel supply, chemical analysis, biological fields, drug injection, lubrication, and irrigation due to their advantages of small size, low power consumption, no wear, and reliable performances. The various forms and working processes of valve-less pumps are discussed, along with the advantages and disadvantages of pump characteristics under different driving conditions. The applications and future development of valve-less pumps are also analyzed. This work provides guidance for enhancing output performances and applications.
REVIEW OF SCIENTIFIC INSTRUMENTS
(2023)
Article
Physics, Multidisciplinary
Hang Zang, Zhiming Shi, Mingrui Liu, Yuping Jia, Ke Jiang, Jianwei Ben, Yang Chen, Shunpeng Lv, Xiaojuan Sun, Dabing Li
Summary: In this study, the atomic structure of Al1-xScxN and its effect on its piezoelectric and ferroelectric properties were investigated using first-principles calculations. It was found that Al1-xScxN with a phase separation feature was more stable than the corresponding wurtzite structure. The piezoelectric response of Al1-xScxN depended strongly on the atomic arrangements, with different structures exhibiting positive and negative piezoelectric coefficients.
SCIENCE CHINA-PHYSICS MECHANICS & ASTRONOMY
(2023)
Article
Chemistry, Multidisciplinary
Kai Chen, Tao Tao, Wenxiao Hu, Yucong Ye, Kaiwen Zheng, Jiandong Ye, Ting Zhi, Xiwei Wang, Bin Liu, Rong Zhang
Summary: High-quality polycrystalline diamond films with highly ordered (100) orientation were prepared using microwave plasma chemical vapor deposition. The effects of growth parameters on the microstructure, quality, and residual stress of diamond films were investigated. Optimized growth parameters of 2% methane concentration, 250 Torr pressure, and 1050 degrees Celsius temperature resulted in high growth rate and narrow Raman peak width, indicating high crystal quality. This method shows promise for rapid growth of high-quality diamond films, essential for cost-effective improvements in diamond-related applications.
Review
Materials Science, Multidisciplinary
Zhibin Zhang, Stiven Forti, Wanqing Meng, Sergio Pezzini, Zehua Hu, Camilla Coletti, Xinran Wang, Kaihui Liu
Summary: Two-dimensional (2D) materials have garnered extensive research attention due to their intriguing physical properties and potential applications in electronics and optoelectronics. This review provides an in-depth analysis of the growth and applications of 2D materials, focusing on single crystals. The review covers growth strategies for monolayer and multilayer single crystals, as well as their use in electronic and optoelectronic devices.
Article
Multidisciplinary Sciences
Zhongzhong Luo, Xiangxiang Song, Xiaolong Liu, Xiangqian Lu, Yu Yao, Junpeng Zeng, Yating Li, Daowei He, Huijuan Zhao, Li Gao, Zhihao Yu, Wei Niu, Huabin Sun, Yong Xu, Shujuan Liu, Wei Qin, Qiang Zhao
Summary: Understanding the interaction between magnetic metals and organic semiconductors at interfaces is crucial for realizing the potential of organic materials in spintronic applications. In this study, we demonstrate atomically smooth metal/molecule interfaces using nondestructive transfer of magnetic electrodes onto epitaxially grown single-crystalline organic films. By investigating spin injection in spin-valve devices based on organic films of different layers, we find that the molecular packing plays a key role in spin polarization. Our findings provide promising strategies for designing interfaces in organic spintronic devices.
Article
Nanoscience & Nanotechnology
Long-Bing He, Lei Shangguan, Yu-Tian Gao, Sen Yang, Ya-Ting Ran, Zi-Yu Lu, Jiong-Hao Zhu, Bin-Jie Wang, Li-Tao Sun
Summary: In this paper, a piston-cylinder-configured nano-motor prototype is designed and fabricated, in which nanometer-sized Te segments are electrically controlled to reciprocate inside the carbon cylinder serving as nano pistons. With bias control, a circulating rate of 0-4.3 counts per second has been achieved. This prototype is the smallest piston cylinder-type nano-motor that has ever been reported and can provide new insights into investment casting-assisted nano electromechanical device fabrication.
ACS APPLIED NANO MATERIALS
(2023)
Article
Nanoscience & Nanotechnology
Lei Shangguan, Long-Bing He, Ya-Ting Ran, Hua Hong, Jiong-Hao Zhu, Yu-Tian Gao, Li-Tao Sun
Summary: In this study, hydrothermally synthesized Te nanosheets were investigated at different growth stages using transmission electron microscopy and electrical tests. Three main types of Te nanosheets and their variations were identified. Different types of Te nanosheets dominated at different reaction stages, suggesting a sequential growth scenario. The growth kinetics were co-determined by surfactants and surface energy, while crystallographic attachments resulted in specifically included angles in V-shaped Te nanosheets. The fractions of different types of Te nanosheets, as well as their crystalline structures, interfaces, and preferential growth orientations, were statistically tracked. Additionally, the electrical properties of the Te nanosheets showed an interface-related feature. These findings provide new insights into the synthesis and properties of low-dimensional Te functional materials.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Biotechnology & Applied Microbiology
Huibin Shi, Taotao Li, Manchun Su, Huihui Wang, Qiao Li, Xia Lang, Youji Ma
Summary: In this study, the distribution characteristics of copy number variations (CNVs) in Tibetan sheep were investigated using whole-genome resequencing. The results showed a large number of CNV events in Tibetan sheep, which were associated with their adaptability and complex traits. Functional enrichment analysis revealed that these CNV regions were related to organ development, neural regulation, immune regulation, digestion, and metabolism. In addition, some CNV regions overlapped with quantitative trait loci (QTLs) associated with body weight and growth traits in sheep. Furthermore, significant differences were observed between different breeds, indicating that CNVs may play an important role in population differences in sheep.
Article
Chemistry, Analytical
Tingting Liu, Kaiwen Zheng, Tao Tao, Wenxiao Hu, Kai Chen, Ting Zhi, Yucong Ye, Zili Xie, Yu Yan, Bin Liu, Rong Zhang
Summary: This paper investigates diamond substrates with nanostructures to address the issue of heat aggregation in GaN-based power devices. Simulation results confirm the enhanced performance of the device with diamond nanostructures, and the fabrication of such a diamond substrate is demonstrated. The diamond substrate with square nanopillars 2000 nm in height exhibits optimal heat dissipation performance, reducing the temperature from 121 degrees C to 114 degrees C.
Article
Crystallography
Wenxiao Hu, Xinxin Yu, Tao Tao, Kai Chen, Yucong Ye, Jianjun Zhou, Zili Xie, Yu Yan, Bin Liu, Rong Zhang
Summary: In this paper, high quality diamond film with atomically flat surface was grown by microwave plasma chemical vapor deposition. A high growth rate of 7 μm/h was achieved without nitrogen doping, and the surface roughness was reduced from 0.92 nm to 0.18 nm by pre-etched process. H-terminated diamond MOSFETs fabricated on a high-quality epitaxial diamond layer showed enhanced saturated current density, reduced hysteresis of the transfer curve, and reduced shift of the threshold voltage.
Article
Materials Science, Multidisciplinary
Hang Zang, Zhiming Shi, Jianwei Ben, Ke Jiang, Yang Chen, Shanli Zhang, Mingrui Liu, Tong Wu, Yuping Jia, Xiaojuan Sun, Dabing Li
Summary: III-nitride materials like AlN, GaN, and InN have promising applications in the semiconductor industry, but the high defect densities resulting from the growth process can impact device performance. In this study, a first-principles investigation was conducted to understand the growth and electronic properties of stacking mismatch boundaries (SMBs) in III-nitride materials. The study revealed that SMBs can be categorized into three types based on the terrace edge of the coalescent normal and stacking-fault regions, and the type can be controlled by varying the chemical potential and initial nucleation size during growth. It was also found that SMBs produce in-gap states with various properties, such as itinerant magnetism and optical transition.
Review
Chemistry, Multidisciplinary
Tiange Zhao, Jiaxiang Guo, Taotao Li, Zhen Wang, Meng Peng, Fang Zhong, Yue Chen, Yiye Yu, Tengfei Xu, Runzhang Xie, Pingqi Gao, Xinran Wang, Weida Hu
Summary: The fabrication of large-area two-dimensional (2D) materials is crucial for their industrial applications, and chemical vapor deposition (CVD) is a promising method for producing high-quality films at scale. Recent advances in epitaxial growth of large-area single-crystalline graphene, hexagonal boron nitride, and transition-metal dichalcogenides have emphasized the importance of substrate engineering in terms of lattice orientation, surface steps, and energy considerations. This review focuses on the current strategies and underlying mechanisms, and discusses future directions in epitaxial substrate engineering for wafer-scale integration of 2D materials in electronics and photonics.
CHEMICAL SOCIETY REVIEWS
(2023)
