Review
Chemistry, Multidisciplinary
Xiankun Zhang, Yanzhe Zhang, Huihui Yu, Hang Zhao, Zhihong Cao, Zheng Zhang, Yue Zhang
Summary: As silicon-based electronic devices face challenges of material performance decrease and interface quality degradation, ultrathin 2D materials are considered as potential candidates in future electronics due to their atomically flat surfaces and excellent immunity to short-channel effects. By freely stacking and forming high-quality heterostructure interfaces, all-2D electronics based on 2D van der Waals (vdW) interfaces can exhibit more comprehensive functionality and better performance. However, improving the compatibility of 2D material devices with silicon-based industrial technology remains a critical challenge.
ADVANCED MATERIALS
(2023)
Article
Nanoscience & Nanotechnology
Leihao Feng, Xi Zhang, Quan Zheng, Ya Nie, Gang Xiang
Summary: The structural and electronic properties of a two-dimensional SiAs2/GeAs2 van der Waals heterostructure and its applications have been investigated by first-principles calculations and Silvaco Atlas simulations. The stable heterostructure exhibits an indirect bandgap of 0.99 eV in type II band alignment, making it suitable for light detection and energy harvesting. By applying an appropriate electric field, it can exhibit a direct bandgap up to 0.66 eV. The results show that the band alignment of the heterostructure can be tuned between type II and type I for various applications.
Review
Chemistry, Multidisciplinary
Hui-Lei Hou, Cosimo Anichini, Paolo Samori, Alejandro Criado, Maurizio Prato
Summary: In the past 15 years, 2D materials have revolutionized materials science and become powerful components for high-performance chemical sensors. By forming van der Waals heterostructures (VDWHs), the individual drawbacks of 2D materials can be overcome, leading to superior sensitivities, selectivity, and stability. This review discusses the latest developments in chemical sensors based on VDWHs of 2D materials, including sensing mechanisms and future directions with potential impact in environmental sciences and biomedical applications.
ADVANCED FUNCTIONAL MATERIALS
(2022)
Article
Chemistry, Physical
Bi Luo, Peng Wu, Jiafeng Zhang, Liang Cao, Chunhui Wang, Bin Lu, Bao Zhang, Xing Ou
Summary: A two-dimensional space confined strategy is proposed to construct van der Waals heterostructures for superior potassium-ion battery (PIB) anodes. The synergistic effects in the 2D heterostructure greatly enhance electron transportation and ions diffusion, while inhibiting polysulfide dissolution for increased structural durability. As a result, the synthesized C/MoS2/G anode demonstrates remarkable K-storage performance with high reversible capacity, excellent rate capability, and superior long-cycling stability.
Article
Chemistry, Multidisciplinary
Zhouxiaosong Zeng, Cuihuan Ge, Kai Braun, Martin Eberle, Yufan Wang, Biyuan Zheng, Chenguang Zhu, Xingxia Sun, Lanyu Huang, Ziyu Luo, Ying Chen, Huigao Duan, Shuangyin Wang, Dong Li, Fei Gao, Anlian Pan, Xiao Wang
Summary: In this study, van der Waals heterostructure photodetectors based on MoS2/WSe2 p-n and n-n junctions were constructed and the picosecond photoresponse was manipulated by combining photovoltaic and photothermoelectric effects. The experiments showed that a TRPC peak at zero time delay was observed in the n-n junction device with a short decay time, while a TRPC dip was observed in the p-n junction and pure WSe2 devices, indicating opposite current polarities between PV and PTE. By modulating the ultrafast photocurrent, a transition from a peak to a dip was realized, and detailed carrier transport dynamics were analyzed.
ADVANCED FUNCTIONAL MATERIALS
(2022)
Article
Chemistry, Multidisciplinary
Fan Ye, Arnob Islam, Teng Zhang, Philip X-L Feng
Summary: This study demonstrates atomically thin MoS2-graphene vdW heterostructure nanoelectromechanical resonators with ultrawide frequency tuning, achieving the largest tuning range to date. The 2D Young's moduli of the constituent crystals play a crucial role in determining the tuning range, with materials having lower 2D moduli showing wider tuning ranges.
Article
Chemistry, Physical
Dan Yang, Chunhui Lu, Jingyao Ma, Mingwei Luo, Qiyi Zhao, Yanping Jin, Xinlong Xu
Summary: The nonlinear optical properties of type-III van der Waals heterostructures are often neglected, but this study successfully identified and confirmed the band alignment of a Bi2S3/MoS2 vdWH. The saturable absorption response of Bi2S3/MoS2 was found to be significantly enhanced compared to pure Bi2S3 and MoS2, with potential applications in nonlinear optoelectronics.
APPLIED SURFACE SCIENCE
(2021)
Article
Chemistry, Multidisciplinary
Wanhan Su, Sen Zhang, Chang Liu, Qianlei Tian, Xingqiang Liu, Kenli Li, Yawei Lv, Lei Liao, Xuming Zou
Summary: This study demonstrates a 2D PVK and ReS2 heterostructure with high sensitivity and broad spectral response. The strong interlayer coupling and large type-II band offsets contribute to the improved performance of the heterostructure, making it a promising candidate for self-driven photodetectors.
Article
Nanoscience & Nanotechnology
Huabin Zhou, Haojie Lai, Xiao Sun, Ning Zhang, Yuee Wang, Pengyi Liu, Yang Zhou, Weiguang Xie
Summary: Researchers have developed a van der Waals heterostructure composed of few-layer 2D perovskite/MoS2 nanoflakes, which exhibits high-sensitivity detection performance over a broad spectral region, including the near-infrared wavelength. The sensitive and ultrafast photoresponse at the near-infrared wavelength is attributed to the strong interlayer transition of sub-band-gap photons and the rapid separation of photogenerated carriers.
ACS APPLIED MATERIALS & INTERFACES
(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
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)
Review
Chemistry, Multidisciplinary
Iosif Tantis, Smita Talande, Vasileios Tzitzios, Georgia Basina, Vishal Shrivastav, Aristides Bakandritsos, Radek Zboril
Summary: This review focuses on recent advances in electrochemical energy storage (EES) technologies related to 2D crystals originating from non-layered 3D solids (non-van der Waals; nvdW) and their influence on the materials' features. The methods and challenges in top-down and bottom-up strategies towards nvdW 2D sheets and their applications in EES are discussed. Moreover, the opportunities and challenges of nvdW 2D systems in various applications are highlighted.
ADVANCED FUNCTIONAL MATERIALS
(2023)
Review
Chemistry, Multidisciplinary
Xiantong Yu, Xin Wang, Feifan Zhou, Junle Qu, Jun Song
Summary: 2D van der Waals heterojunctions are a novel type of metamaterial that are flexible, adjustable, and easy to assemble. By combining different 2D materials and stacking methods, they can exhibit more abundant optical properties and have made significant progress in the field of nanophotonic devices.
ADVANCED FUNCTIONAL MATERIALS
(2021)
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
Physics, Applied
Hui Zou, Jiangling Pan, Fangping Ouyang
Summary: The structural and electronic properties of the C3N/antimonene van der Waals heterostructure are investigated, showing that it has potential for applications in multifunctional optoelectronic devices. The heterostructure exhibits a tunable band gap and can prevent recombination of electron-hole pairs. By applying strain or electric field, its band alignment and semiconductor-metal transitions can be controlled.
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2022)
Review
Physics, Condensed Matter
Kasun Premasiri, Xuan P. A. Gao
JOURNAL OF PHYSICS-CONDENSED MATTER
(2019)
Review
Nanoscience & Nanotechnology
Chieh-Wen Liu, Zhenhua Wang, Richard L. J. Qiu, Xuan P. A. Gao
Article
Chemistry, Physical
Javier Taboada-Gutierrez, Gonzalo alvarez-Perez, Jiahua Duan, Weiliang Ma, Kyle Crowley, Ivan Prieto, Andrei Bylinkin, Marta Autore, Halyna Volkova, Kenta Kimura, Tsuyoshi Kimura, M. -H. Berger, Shaojuan Li, Qiaoliang Bao, Xuan P. A. Gao, Ion Errea, Alexey Y. Nikitin, Rainer Hillenbrand, Javier Martin-Sanchez, Pablo Alonso-Gonzalez
Article
Chemistry, Physical
Kyle Crowley, Kevin Pachuta, Santosh Kumar Radha, Halyna Volkova, Alp Sehirlioglu, Emily Pentzer, Marie-Helene Berger, Walter R. L. Lambrecht, Xuan P. A. Gao
JOURNAL OF PHYSICAL CHEMISTRY C
(2020)
Article
Physics, Applied
Santosh Kumar Radha, Kyle Crowley, Brian A. Holler, Xuan P. A. Gao, Walter R. L. Lambrecht, Halyna Volkova, Marie-Helene Berger, Emily Pentzer, Kevin G. Pachuta, Alp Sehirlioglu
Summary: This article discusses the fundamental properties of 2D oxides and their preparation methods, as well as the effects on phonons, electronic band structures, and electronic screening. It also considers electronic structure theory and the importance of surface in ultrathin materials.
JOURNAL OF APPLIED PHYSICS
(2021)
Article
Chemistry, Inorganic & Nuclear
Mingze Li, Zhenhua Wang, Dan Han, Xudong Shi, Tingting Li, Xuan P. A. Gao, Zhidong Zhang
Summary: The coexistence of bulk electronic band gap and gapless surface states in topological insulators (TIs) offers new opportunities for optoelectronic devices. In this study, we synthesized vertical Sb2Te3 nanoplate film on n-type Si substrates and demonstrated its photodetection response. The small bulk bandgap and surface states conduction of Sb2Te3 lead to effective light absorption and photocarrier transport, resulting in significant photoresponse over a wide spectral range.
JOURNAL OF SOLID STATE CHEMISTRY
(2022)
Article
Nanoscience & Nanotechnology
Roshan Jesus Mathew, Kai-Hsiang Cheng, Christy Roshini Paul Inbaraj, Raman Sankar, Xuan P. A. Gao, Yit-Tsong Chen
Summary: In this study, novel anti-ambipolar transistors (AATs) with gate tunable rectifiers were investigated for their optoelectronic applications in cryogenic conditions. A p-SnS/n-MoSe2 cryo-phototransistor was presented, exhibiting unique anti-ambipolar characteristics and cryogenic-enhanced optoelectronic performance. The cryo-phototransistor showed a sharp and highly symmetric anti-ambipolar transfer curve at 77 K, with high responsivity and detectivity in the spectral range of 250-900 nm.
ADVANCED ELECTRONIC MATERIALS
(2023)
Article
Physics, Multidisciplinary
Arvind Shankar Kumar, Chieh-Wen Liu, Shuhao Liu, Xuan P. A. Gao, Alex Levchenko, Loren N. Pfeiffer, Kenneth W. West
Summary: We report an unusual magnetoresistance in a dilute two-dimensional hole system in GaAs/AlGaAs quantum wells, where the magnetoresistance strengthens with increasing temperature even at the Fermi energy. This positive magnetoresistance at high temperatures is attributed to the viscous transport of the 2D hole fluid in the hydrodynamic regime. These findings provide insights into the collective transport of strongly interacting carriers and offer new possibilities for high-temperature magnetoresistance.
PHYSICAL REVIEW LETTERS
(2023)
Article
Engineering, Electrical & Electronic
YiTaek Choi, Yongwook Seok, Hanbyeol Jang, Arvind Shankar Kumar, Kenji Watanabe, Takashi Taniguchi, Xuan P. A. Gao, Kayoung Lee
Summary: By conducting four-terminal measurements, we investigated the transport properties and scattering mechanisms of high-mobility InSe nanosheets encapsulated by hBN. The conducted conductivities increased as temperature decreased, exhibiting metallic behavior.
ACS APPLIED ELECTRONIC MATERIALS
(2021)
Article
Materials Science, Multidisciplinary
Arvind Shankar Kumar, Kasun Premasiri, Min Gao, U. Rajesh Kumar, Raman Sankar, Fang-Cheng Chou, Xuan P. A. Gao
Article
Chemistry, Physical
Tianqi Liu, Xinyu Liu, Souvik Bhattacharya, Zhipeng Ye, Rui He, Xuan P. A. Gao, Rohan Akolkar, R. Mohan Sankaran
ACS APPLIED ENERGY MATERIALS
(2019)
Article
Chemistry, Multidisciplinary
Kasun Premasiri, Wei Zheng, Biao Xu, Tao Ma, Lin Zhou, Yue Wu, Xuan P. A. Gao
