Article
Chemistry, Physical
Shijie Wang, Guangyu Geng, Yang Sun, Sen Wu, Xiaodong Hu, Enxiu Wu, Jing Liu
Summary: In this study, a bipolar memory based on MoTe2/h-BN/graphene heterostructure was developed, which has non-volatile and dynamically tunable polarity. This memory operates in a non-volatile bipolar mode, with integration of both n- and p-type memories in a single 2D heterostructure.
Article
Physics, Applied
Jiacheng Li, Hui Gao, Guoliang Zhou, Yan Li, Ye Chai, Guolin Hao
Summary: Atomically thin molybdenum ditelluride (MoTe2) has unique properties, leading to its intensive study for applications in electronics and optoelectronics. Achieving a controllable growth of pure 1T', 2H MoTe2, and 1T'-2H mixed-phase MoTe2 was successfully demonstrated through growth temperature and time adjustments. The experimental results provide insights into realizing phase transitions of two-dimensional materials for future electronic and optoelectronic devices.
JOURNAL OF APPLIED PHYSICS
(2022)
Article
Engineering, Electrical & Electronic
Jing Chen, Ping Li, Junqiang Zhu, Xiao-Ming Wu, Ran Liu, Jing Wan, Tian-Ling Ren
Summary: Transition metal dichalcogenides (TMDs) have outstanding physical and electrical properties, making them a promising platform for future electronic devices. MoTe2, with a bandgap close to silicon, shows potential for next-generation integrated circuits. By utilizing the ambipolar conduction property in MoTe2, high-quality polarity-controllable MoTe2 transistors (PCMTs) were successfully fabricated in our work, demonstrating their promise as building blocks for MoTe2 logic ICs.
IEEE TRANSACTIONS ON ELECTRON DEVICES
(2021)
Article
Chemistry, Multidisciplinary
Eunji Ji, Jong Hun Kim, Wanggon Lee, June-Chul Shin, Hyungtak Seo, Kyuwook Ihm, Jin-Woo Park, Gwan-Hyoung Lee
Summary: Transition metal dichalcogenides (TMDs) are promising candidates for the semiconductor industry due to their superior electrical properties. This study demonstrates the XeF2-mediated surface oxidation of 2H-MoTe2 to form a thin and uniform oxidized layer, which helps reduce contact resistance and improve field-effect hole mobility. The work provides a straightforward and effective method for 2D electronics.
NANOSCALE ADVANCES
(2022)
Article
Chemistry, Physical
Seung Gi Seo, Jinheon Jeong, Seung Yeob Kim, Ajit Kumar, Sung Hun Jin
Summary: This article introduces transition metal dichalcogenides as an alternative to scaling down Si technology and discusses the application of counter doping technology in TMDC field-effect transistors. The counter doping mechanism is systematically investigated using various characterization techniques, and complementary inverters achieved through specific treatments are demonstrated.
Article
Chemistry, Multidisciplinary
Ling Lan, Ying-Jie Sun, Xiao-Yang Jin, Li-Jun Xie, Li Liu, Liang Cheng
Summary: The study presented the design, synthesis, computational, and experimental evaluation of the first photo-activatable small-molecule methyltransferase agonist, which demonstrated spatial and temporal control of biological effects through the use of a photo-removable protecting group. The results indicated rapid release of the active compound from the caged molecule upon short UV light exposure in cells, leading to significant hypermethylation of m(6)A modification in transcriptome RNAs and validating the concept of photo-activatable small organic molecules in RNA epigenetic research.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2021)
Article
Nanoscience & Nanotechnology
Geun Woo Baek, Seung Gi Seo, Donghyo Hahm, Wan Ki Bae, Jeonghun Kwak, Sung Hun Jin
Summary: The study demonstrates the operation of QLEDs controlled by MoTe2 TFTs, molecular doping with PLL achieves outstanding type conversion of the TFTs and surface ligand modification improves QLED performance, resulting in enhanced current efficiency and longer lifetimes. Additionally, MoTe2 TFTs show their capabilities to drive QLEDs for potential applications with decent switching properties and operation stability.
ADVANCED ELECTRONIC MATERIALS
(2021)
Article
Materials Science, Multidisciplinary
Raphael Boeckle, Masiar Sistani, Boris Lipovec, Darius Pohl, Bernd Rellinghaus, Alois Lugstein, Walter M. Weber
Summary: Conventional FET concepts are limited by steep doping requirements, while RFETs allow dynamic device operation. Ge is seen as a promising material for reducing power consumption, but its use has been restricted to simulations and basic demonstrations.
ADVANCED MATERIALS TECHNOLOGIES
(2022)
Article
Chemistry, Multidisciplinary
Byung Min Ko, Muhammad Farooq Khan, Ghulam Dastgeer, Gyu Nam Han, Muhammad Asghar Khan, Jonghwa Eom
Summary: In this study, the Fermi level of MoTe2 was controlled by deep ultraviolet light illumination in different gaseous environments. The reconfigurable carrier type and photoresponse of MoTe2 under different treatments were investigated. These findings provide potential for wider applications of MoTe2 in optoelectronic devices.
NANOSCALE ADVANCES
(2022)
Article
Nanoscience & Nanotechnology
Taekham Kim, Doohyeok Lim, Jaemin Son, Kyoungah Cho, Sangsig Kim
Summary: This study demonstrates reconfigurable n- and p-channel operations in a tri-top-gate field-effect transistor made of a p(+)-i-n(+) silicon nanowire. The device features simple design and high performance, allowing control of both operation modes on the same device.
Article
Chemistry, Physical
Cuixiu Xiong, Liu Chao, Biao Zeng, Kuan Wu, Min Li, Banxian Ruan, Baihui Zhang, Enduo Gao, Hongjian Li
Summary: A five-step coupled pyramid-shaped monolayer graphene metamaterial is proposed, with a dynamically controllable PIT featuring four transparency peaks predicted for the first time. Tunable multi-switch and good slow light effect are expected, with a maximum modulation depth of 16.89 dB.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2021)
Article
Optics
Ting Jiang, Yiru Wang, Wanxin Huang, Haifeng Ling, Guofeng Tian, Yunfeng Deng, Yanhou Geng, Deyang Ji, Wenping Hu
Summary: This study introduces carboxyl groups into polymer dielectrics to achieve high device mobility and optical figures of merit at a low operating voltage. It also improves image sensing and memory capabilities.
LIGHT-SCIENCE & APPLICATIONS
(2023)
Article
Physics, Applied
Ruijie Li, Haixia Liu, Peng Xu, Jiaqi Han, Long Li
Summary: This paper presents a new approach for a light-controlled metasurface with a controllable modulation range of reflection phase. Each unit of the metasurface can be independently programmed optically, simplifying the difficulty of array expansion in large-scale designs. The feasibility of the proposed design is verified through simulations and experiments.
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2022)
Article
Multidisciplinary Sciences
Qinglong Shi, Meichen Xu, Rui Chang, Devenderan Ramanathan, Beatriz Penin, Ignacio Funes-Ardoiz, Juntao Ye
Summary: A metal-free platform using peptide- or sugar-derived chiral thiols and deuterium oxide enables asymmetric open-shell deuteration at non-benzylic positions. This approach allows for multiple types of deuterofunctionalization reactions of exocyclic olefins and achieves high levels of enantioselectivity and deuterium incorporation.
NATURE COMMUNICATIONS
(2022)
Article
Materials Science, Multidisciplinary
Gun-Woo Lee, Jae-Hyeok Oh, Sung-Nam Lee
Summary: This study demonstrates the achievement of full-color monolithic LEDs using hexagonal epitaxial lateral overgrowth and pulse modulation modes. By reducing crystal defects and controlling indium incorporation, the LEDs emit red, green, and blue light with the same intensity, leading to the development of high-performance multifunctional lighting sources.
ADVANCED OPTICAL MATERIALS
(2023)
Article
Physics, Multidisciplinary
Yi-Di Pang, En-Xiu Wu, Zhi-Hao Xu, Xiao-Dong Hu, Sen Wu, Lin-Yan Xu, Jing Liu
Summary: This study investigates the impact of graphene and metal contacts on the performance of multi-layered WSe2 FETs, revealing that graphene contact can lower the contact barrier, reduce charge scattering, and induce a metal-insulator transition phenomenon. Additionally, it is found that graphene contact enables modulation of the Fermi level to match that of the channel material, contributing to improved carrier mobility under different temperatures.
Article
Chemistry, Multidisciplinary
Chunhua An, Fengmin Nie, Rongjie Zhang, Xinli Ma, Dahao Wu, Yang Sun, Xiaodong Hu, Dong Sun, Li Pan, Jing Liu
Summary: A flexible photodetector with strong self-healing capability and stable performance under large deformation is developed in this article. The photodetector shows stable photoresponse and even increases under small tensile strain, with a large-area 2D material self-healing photodetection array designed for pattern recognition.
ADVANCED FUNCTIONAL MATERIALS
(2021)
Article
Physics, Applied
Yuan Xie, Enxiu Wu, Guangyu Geng, Daihua Zhang, Xiaodong Hu, Jing Liu
Summary: In this study, a gate-tunable MoTe2/WTe2 heterostructure was developed, which exhibited a reversible and widely tunable rectification ratio and a tunable self-excited photocurrent. The MoTe2/WTe2 heterostructure also showed excellent photo-response, enabling its usage in multifunctional devices for photovoltaic and logic applications.
APPLIED PHYSICS LETTERS
(2021)
Article
Nanoscience & Nanotechnology
Guangyu Geng, Enxiu Wu, Linyan Xu, Xiaodong Hu, Xiaopu Miao, Jing Zou, Sen Wu, Jing Liu, Yang Liu, Zhongdu He
Summary: This study develops a method to manipulate the dielectric properties of two-dimensional boron nitride (h-BN) through ion implantation and successfully constructs MoTe2 heterojunction by controlling the dielectric properties of h-BN. By modulating the dielectric properties of h-BN, stable anti-ambipolar behavior can be achieved, and a ternary inverter based on anti-ambipolar transistor has been preliminarily implemented.
Article
Chemistry, Physical
Shijie Wang, Guangyu Geng, Yang Sun, Sen Wu, Xiaodong Hu, Enxiu Wu, Jing Liu
Summary: In this study, a bipolar memory based on MoTe2/h-BN/graphene heterostructure was developed, which has non-volatile and dynamically tunable polarity. This memory operates in a non-volatile bipolar mode, with integration of both n- and p-type memories in a single 2D heterostructure.
Article
Multidisciplinary Sciences
Wei Lu, Zipu Fan, Yunkun Yang, Junchao Ma, Jiawei Lai, Xiaoming Song, Xiao Zhuo, Zhaoran Xu, Jing Liu, Xiaodong Hu, Shuyun Zhou, Faxian Xiu, Jinluo Cheng, Dong Sun
Summary: This study reveals the transient photothermoelectric response of Dirac semimetallic Cd3As2, namely the photo-Seebeck effect and photo-Nernst effect, by studying the terahertz emission from the transient photocurrent induced by these effects. The response clearly indicates an order of magnitude enhancement on transient photothermoelectric current generation when a weak magnetic field is applied. These results highlight the enhancement of thermoelectric performance can be achieved in topological Dirac semimetals based on the Nernst effect.
NATURE COMMUNICATIONS
(2022)
Article
Nanoscience & Nanotechnology
Xinli Ma, Jinxi Zhang, Yang Sun, Chen Wu, Guangyu Geng, Jing Zhang, Enxiu Wu, Linyan Xu, Sen Wu, Xiaodong Hu, Jing Liu
Summary: Defect engineering is a promising method to create patterns and achieve unconventional properties on two-dimensional materials. This study systematically investigates line defects formed by introducing oxygen during CVD growth and demonstrates the controllable density of line defects by controlling the oxygen concentration. This work is expected to inspire the development of patterned functional 2D materials by defect engineering.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Nanoscience & Nanotechnology
Jinxi Zhang, Chen Wu, Qiankun Zhang, Jing Liu
Summary: This work proposes a surface acoustic wave (SAW) device as a controllable strain modulation platform for 2D materials with sub-micro scale resolution. The platform utilizes a piezoelectric material (LiNbO3) as the substrate and interdigitated transducers (IDT) to generate SAW on the surface. The SAW causes surface deformation, which is transferred to the 2D materials on the substrate. The platform demonstrates the tunability of physical properties and acousto-electric coupling between SAW and 2D materials.
Article
Nanoscience & Nanotechnology
Xuesong Zhu, Dahao Wu, Shengzhi Liang, Jing Liu
Summary: This article presents a strain insensitive flexible photodetector based on a MoS2/MoTe2 heterostructure on a polyimide substrate. The device demonstrates excellent flexibility and mechanical endurance, and the proposed configuration cancels the effects of strain on device performance.
Article
Chemistry, Multidisciplinary
Sunyingyue Geng, Shuangqing Fan, Hangfei Li, Yashuai Qi, Chunhua An, Enxiu Wu, Jie Su, Jing Liu
Summary: Artificial neuromuscular system can enhance sensorimotor coordination and interactivity of advanced robots and interactive systems. A triboelectric nano-generator, SnErOx neuromorphic transistors, and a signal-converting system are used to mimic the sensing, processing, and manipulation of neuromuscular information. The system can implement multiple operation modes of muscle and demonstrate real-time gesture recognition and robotic manipulation.
ADVANCED FUNCTIONAL MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Shuangqing Fan, Enxiu Wu, Minghui Cao, Ting Xu, Tong Liu, Lijun Yang, Jie Su, Jing Liu
Summary: Designing low-power and flexible artificial neural devices with artificial neural networks is a promising avenue for creating brain-computer interfaces (BCIs). Herein, we report the development of flexible In-Ga-Zn-N-O synaptic transistors (FISTs) that can simulate essential and advanced biological neural functions. These FISTs are optimized to achieve ultra-low power consumption under a super-low or even zero channel bias, making them suitable for wearable BCI applications. The effective tunability of synaptic behaviors promotes the realization of associative and non-associative learning, facilitating Covid-19 chest CT edge detection. Importantly, FISTs exhibit high tolerance to long-term exposure under an ambient environment and bending deformation, indicating their suitability for wearable BCI systems. We demonstrate that an array of FISTs can classify vision-evoked EEG signals with up to 87.9% and 94.8% recognition accuracy for EMNIST-Digits and MindBigdata, respectively. Thus, FISTs have enormous potential to significantly impact the development of various BCI techniques.
MATERIALS HORIZONS
(2023)
