Article
Chemistry, Multidisciplinary
Huije Ryu, Yangjin Lee, Hyun-Jung Kim, Seoung-Hun Kang, Yoongu Kang, Kangwon Kim, Jungcheol Kim, Blanka E. Janicek, Kenji Watanabe, Takashi Taniguchi, Pinshane Y. Huang, Hyeonsik Cheong, In-Ho Jung, Kwanpyo Kim, Young-Woo Son, Gwan-Hyoung Lee
Summary: This study discusses the characteristics of phase transition in 2D materials, demonstrates the phase transition properties of MoTe2 at different layers, and explores how to control the vertical and lateral phase transitions of MoTe2 by inserting graphene layers and controlling the thickness of heterostructures.
ADVANCED FUNCTIONAL MATERIALS
(2021)
Article
Nanoscience & Nanotechnology
Yuchuan Pan, Xiaochi Liu, Junqiang Yang, Won Jong Yoo, Jian Sun
Summary: Two-dimensional transition-metal dichalcogenide (TMDC) based semiconducting van der Waals (vdW) heterostructures have unique and tunable properties, and controlling carrier type and band alignment is crucial for desired performances. In this study, carrier type and band alignment in a vertical MoTe2/MoS2 heterojunction are controlled via thickness engineering and surface charge transfer doping, leading to the realization of multifunctional diodes that are universal and applicable to emerging nanoelectronics based on 2D materials.
ACS APPLIED MATERIALS & INTERFACES
(2021)
Article
Chemistry, Multidisciplinary
Xuan Ji, Zongqi Bai, Fang Luo, Mengjian Zhu, Chucai Guo, Zhihong Zhu, Shiqiao Qin
Summary: The research team successfully fabricated MoTe2-MoS2 van der Waals heterostructure photodetectors with great performance, operating without bias voltage, high photocurrent on/off ratio, and high photoresponsivity.
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
Chemistry, Analytical
Do-Hyun Park, Hyo Chan Lee
Summary: The development of short-wave infrared photodetectors based on different 2D materials operating at room temperature has attracted attention. Van der Waals heterostructures of 2D materials with type-II band alignment have potential for use in photodetectors, but high photoresponsivity is essential. In this study, we investigated the photogating of graphene using a monolayer-MoS2/monolayer-MoTe2 van der Waals heterostructure. By stacking MoS2/MoTe2 on graphene, a broadband photodetector with high photoresponsivity (>100 mA/W) and low dark current (60 nA) across a wide wavelength range (488-1550 nm) was fabricated.
Article
Chemistry, Multidisciplinary
Jialing Wen, Wenhui Tang, Zhuo Kang, Qingliang Liao, Mengyu Hong, Junli Du, Xiankun Zhang, Huihui Yu, Haonan Si, Zheng Zhang, Yue Zhang
Summary: This study introduces a new memory design using 2D graphdiyne as the charge-trapping layer, achieving a bilayer memory GDY/MoS2 with a large memory window and high degree of modulation. It demonstrates data storage capability in different operating modes, showcasing the potential for high-performance dielectric-free electronics and applications such as optical memories and artificial synaptic.
Article
Nanoscience & Nanotechnology
Zhiying Dan, Baoxiang Yang, Qiqi Song, Jianru Chen, Hengyi Li, Wei Gao, Le Huang, Menglong Zhang, Mengmeng Yang, Zhaoqiang Zheng, Nengjie Huo, Lixiang Han, Jingbo Li
Summary: In recent years, the development of 2D nonlayered Bi2O2Se-based electronics and optoelectronics has attracted great attention due to their high electron mobility, stability, and narrow band gaps. However, conventional Bi2O2Se-based photodetectors suffer from issues such as high dark current, slow response speed, and persistent photoconductivity effect, limiting their applications in fast-response imaging sensors and low-power broadband detection. In this study, a Bi2O2Se/2H-MoTe2 van der Waals heterostructure is reported, which shows improved performance in terms of responsivity, detectivity, and conversion efficiency. The proposed heterostructure is considered a promising candidate for integrated circuits, image sensors, and low-power detection.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Nanoscience & Nanotechnology
Yang Xiao, Wenbo Li, Xiankai Lin, Yi Ji, Zhilong Chen, Yanping Jiang, Qiuxiang Liu, Xingui Tang, Qijie Liang
Summary: This article presents a memristor synaptic device that utilizes the ion migration properties of the MoTe2/MoS2-xOx heterojunction interface. The device demonstrates exceptional linearity, dynamic regulation, and bidirectional independently controllable synaptic plasticity under bimodal regulation. In addition, a deep learning framework is constructed to evaluate the reliability of the devices in neuromorphic computation.
ADVANCED ELECTRONIC MATERIALS
(2023)
Article
Chemistry, Physical
Yecheng Ma, Shan Lu, Xiaolei Dong, Gaorong Han, Zongping Chen, Yong Liu
Summary: In this study, the researchers analyzed the optical parameters of graphene/MoS2 vdW heterostructure using spectroscopic ellipsometry (SE) and investigated the influence of interlayer coupling on its photoelectric properties. The results provide valuable insights into the optical parameters and potential applications of vdW heterostructures in optoelectronics.
APPLIED SURFACE SCIENCE
(2022)
Article
Multidisciplinary Sciences
Long Zhang, Fengcheng Wu, Shaocong Hou, Zhe Zhang, Yu-Hsun Chou, Kenji Watanabe, Takashi Taniguchi, Stephen R. Forrest, Hui Deng
Summary: Controlling matter-light interactions with cavities is crucial in modern science and technology. By integrating MoSe2-WS2 heterobilayers in a microcavity, cooperative coupling between moire-lattice excitons and microcavity photons has been established, providing versatile control of both matter and light. This moire polariton system combines strong nonlinearity and microscopic-scale tuning of matter excitations, offering a platform to study collective phenomena from tunable arrays of quantum emitters.
Article
Nanoscience & Nanotechnology
Jongtae Ahn, Ji-Hoon Kyhm, Hee Kyoung Kang, Namhee Kwon, Hong-Kyu Kim, Soohyung Park, Do Kyung Hwang
Summary: In this study, a MoTe2/ReS2 heterostructure was proposed for a high performance photodiode with linearly polarized photodetection function. The optical properties and energy band diagram of this heterostructure were investigated through spectroscopy measurements, showing a rectification ratio of 10(4), a broad spectral response up to 1310 nm, a responsivity of 0.54 A/W, and rapid photoswitching with a cutoff frequency exceeding 100 kHz. Additionally, the photodiode demonstrated linear polarization dependent characteristics due to the asymmetric crystal structure of ReS2.
Article
Materials Science, Multidisciplinary
S. Samaneh Ataei, Ali Sadeghi
Summary: This paper presents the prediction and underlying mechanism of band edge alignment in two-dimensional van der Waals heterostructures. First-principles calculations reveal charge transfer between layers in the heterostructure, which is responsible for the alignment. It is found that lattice mismatch and interfacial polarization do not affect the alignment, but the heterostructures show weak sensitivity to external strain or electric field.
Article
Materials Science, Multidisciplinary
Yilin Sun, Yingtao Ding, Dan Xie, Mengxing Sun, Jianlong Xu, Pengfei Yang, Yanfeng Zhang, Tianling Ren
Summary: In this study, a reconfigurable optical memory based on MoS2/quantum dots mixed-dimensional heterostructure is demonstrated to achieve high programming/erasing ratio, long retention time, and stable operation cycles that can be gate-tunable. Multi-level optical data storage with ten different states is realized by applying a series of programmable optical signals. The proposed optical memory transistor in low-dimensional system shows promising potential for exploring photoelectric conversion and developing high-performance optoelectronics for various applications.
Article
Chemistry, Multidisciplinary
Xianbo Yu, Guangyu Zhao, Chao Liu, Canlong Wu, Huihuang Huang, Junjie He, Naiqing Zhang
Summary: By constructing van der Waals heterostructures (MoS2/G VH) with graphene monolayers intercalating into MoS2, migration energy barriers of Li+ and Mg2+ were significantly reduced, leading to superior electrochemical performance in Li+/Mg2+ hybrid-ion batteries.
ADVANCED FUNCTIONAL MATERIALS
(2021)
Article
Chemistry, Multidisciplinary
Iwan Susanto, Chi-Yu Tsai, Yen-Teng Ho, Ping-Yu Tsai, Ing-Song Yu
Summary: Van der Waals epitaxial GaN thin films were successfully grown on c-sapphire substrates with a sp(2)-bonded two-dimensional MoS2 buffer layer. Higher substrate temperatures during molecular beam epitaxy (MBE) growth led to improved crystallinity and optical properties of the GaN films, as well as smoother surface morphology and stable chemical composition. Exfoliation of the GaN/MoS2 heterostructure was also examined, revealing the largest granular structures with good crystallinity in films grown at 700 degrees C.
