Article
Nanoscience & Nanotechnology
N. Wang, X. Pan, P. Wang, Y. Wang, H. He, Y. -j. Zeng, L. Zhang, Y. Li, F. Wang, B. Lu, J. Huang, Z. Ye
Summary: This study provides clear evidence that epitaxy on mica is not always of the van der Waals type, but a new epitaxy mode. We have successfully obtained high-quality ZnO epitaxial films with excellent crystal quality and optical properties on fluorphlogopite mica substrates. This compliant substrate epitaxy mechanism offers a low-cost reusable-substrate method for the production of high-quality functional films and flexible devices.
MATERIALS TODAY NANO
(2022)
Article
Nanoscience & Nanotechnology
Jia-Wei Chen, Yun-Guan Wei, Hung-Yang Lo, Sicheng Lu, Yi-Che Chen, Chi-Fong Lei, Po-Liang Liu, Pu Yu, Nien-Ti Tsou, Akira Yasuhara, Wen-Wei Wu, Ying-Hao Chu
Summary: Quasi van der Waals epitaxy is a method to construct combinations of 2D and 3D materials. The interface structure and mechanical robustness of metal/muscovite systems have been studied. The anisotropic thermal expansion and thermal stress tolerance in the silver/muscovite heteroepitaxy have been discovered and demonstrated. The electrothermal and photothermal methods show fast response to thermal stress, proving the interface robustness.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Chemistry, Multidisciplinary
Gaokuo Zhong, Qianxin Chen, Yuan Zhang, Ke Qu, Zhenzhong Yang, Jinbin Wang, Xiangli Zhong, Ming Ma, Chuanlai Ren, Jiangyu Li
Summary: A new strategy is developed to prepare oxide dielectric materials on ultrathin and flexible mica substrates using van der Waals epitaxy. The resulting ultrathin flexible capacitor has a record high energy density of 12.19 J cm(-3) and an efficiency of 90.98%. The superlattice structure can be easily rolled for large-scale manufacturing, and the energy storage performances are well maintained even under large bending deformation and extended bending cycling.
ADVANCED FUNCTIONAL MATERIALS
(2023)
Article
Nanoscience & Nanotechnology
Zenghui Wu, Guoan Tai, Runsheng Liu, Chuang Hou, Wei Shao, Xinchao Liang, Zitong Wu
Summary: This study successfully synthesized borophene films on mica substrates by van der Waals epitaxy, demonstrating excellent photoelectronic properties. These findings open up new possibilities for the application of borophene in novel optoelectronic devices and integrated circuits.
ACS APPLIED MATERIALS & INTERFACES
(2021)
Article
Chemistry, Physical
Saloni Pendse, Yang Hu, Ru Jia, Zhizhong Chen, Lifu Zhang, Skye Williams, Jie Jiang, Edwin Fohtung, Jian Shi
Summary: This study reports a solution-based method for growing two-dimensional hybrid organic-inorganic perovskite (2D-HOIP) materials in the interlayer spacing of muscovite mica. The 2D-HOIP flakes embedded in mica exhibit enhanced photostability compared to conventional perovskite flakes. Liquid-phase growth in the interlayer spacing of van der Waals substrates provides a new avenue for designing novel material structures for optoelectronic devices.
JOURNAL OF PHYSICAL CHEMISTRY C
(2022)
Article
Chemistry, Physical
Wenwu Pan, Junliang Liu, Zekai Zhang, Renjie Gu, Alexandra Suvorova, Sarah Gain, Han Wang, Ziyuan Li, Lan Fu, Lorenzo Faraone, Wen Lei
Summary: The study focuses on van der Waals epitaxy of CdSe thin films on mica substrates and the development of etch-free layer transfer technology for flexible photodetectors. The CdSe thin films demonstrate excellent device performance, making them suitable for full-color imaging.
Article
Chemistry, Multidisciplinary
Le Thi Quynh, Chang-Wei Cheng, Chiao-Tzu Huang, Soniya Suganthi Raja, Ragini Mishra, Meng-Ju Yu, Yu-Jung Lu, Shangjr Gwo
Summary: This article demonstrates the growth of aluminum (Al), copper (Cu), gold (Au), and silver (Ag) epitaxial films on two-dimensional muscovite mica substrates using van der Waals heteroepitaxy. The resulting plasmonic metal films on mica offer the ability to design and fabricate controlled plasmonic nanostructures with tunable surface plasmon resonances. The use of these films enables the development of plasmonic sensors and plasmonic color filters with high performance.
Article
Materials Science, Multidisciplinary
Hou-Guang Chen, Yung-Hui Shih, Huei-Sen Wang, Sheng-Rui Jian, Tzu-Yi Yang, Shu-Chien Chuang
Summary: In this article, the van der Waals epitaxial growth of ZnO layers on mica substrates is demonstrated through a low-temperature hydrothermal process. The addition of sodium citrate into the growth solution significantly promotes the lateral growth of ZnO crystallites, resulting in coalesced and continuous epitaxial layers. The combination of Mist-CVD process further improves the epitaxial quality and surface morphology of the hydrothermally grown ZnO layers.
Article
Multidisciplinary Sciences
You Meng, Xiaocui Li, Xiaolin Kang, Wanpeng Li, Wei Wang, Zhengxun Lai, Weijun Wang, Quan Quan, Xiuming Bu, SenPo Yip, Pengshan Xie, Dong Chen, Dengji Li, Fei Wang, Chi-Fung Yeung, Changyong Lan, Chuntai Liu, Lifan Shen, Yang Lu, Furong Chen, Chun-Yuen Wong, Johnny C. Ho
Summary: The authors explore the unique multi-scale van der Waals interactions in one-dimensional tellurium systems to overcome the restrictions imposed by chemical bonds. They succeed in synthesizing wafer-scale van der Waals nanomeshes composed of self-welding Te nanowires on various substrates at a low temperature, which exhibit improved transport and photoelectric properties. These Te vdWs nanomesh electronics hold great promise in meeting emerging technological demands.
NATURE COMMUNICATIONS
(2023)
Article
Materials Science, Multidisciplinary
Wouter Mortelmans, Stefan De Gendt, Marc Heyns, Clement Merckling
Summary: The application of new materials in nanotechnology, particularly 2D chalcogenides, holds promise for groundbreaking innovations in the semiconductor industry. However, the integration of these materials poses challenges, limiting their usage to research laboratories. Achieving epitaxial growth of large-area, single-crystalline 2D chalcogenides is crucial for meeting industry demands.
APPLIED MATERIALS TODAY
(2021)
Article
Chemistry, Multidisciplinary
Wenwu Pan, Zekai Zhang, Renjie Gu, Shuo Ma, Lorenzo Faraone, Wen Lei
Summary: In this study, the epitaxial growth of HgCdTe (111) thin films on 2D layered transparent mica substrates was achieved through molecular beam epitaxy. A large area free-standing HgCdTe thin film was obtained using an etch-free layer transfer process. The issue of twinning defects in HgCdTe/mica was effectively addressed.
ADVANCED MATERIALS INTERFACES
(2023)
Article
Materials Science, Multidisciplinary
Wen Zhang, Ping Kwan Johnny Wong, Sheng Jiang, Qian Chen, Wei Huang, Andrew Thye Shen Wee
Summary: This review critically evaluates the state-of-the-art of van der Waals interfaces and their potential technological applications in spintronics. It highlights major challenges, proposes a viable solution, and identifies emerging spin-based technologies that could benefit from the versatile van der Waals interfaces enabled by the strategy.
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, Multidisciplinary
Mengying Bian, Liang Zhu, Xiao Wang, Junho Choi, Rajesh Chopdekar, Sichen Wei, Lishu Wu, Chang Huai, Austin Marga, Qishuo Yang, Yuguang C. Li, Fei Yao, Ting Yu, Scott A. Crooker, Xuemei M. Cheng, Renat F. Sabirianov, Shengbai Zhang, Junhao Lin, Yanglong Hou, Hao Zeng
Summary: Realizing van der Waals (vdW) epitaxy provides a breakthrough in circumventing the stringent lattice matching and processing compatibility requirements in conventional covalent heteroepitaxy. This study reports the epitaxial growth of covalent Cr5Te8 2D crystals on vdW WSe2, driven by interfacial dative bond formation. The concept of dative epitaxy is established, which combines the advantages of covalent epitaxy and vdW epitaxy while overcoming their limitations.
ADVANCED MATERIALS
(2022)
Article
Chemistry, Multidisciplinary
Jia-Min Lai, Yu-Jia Sun, Qing-Hai Tan, Ping-Heng Tan, Jun Zhang
Summary: Laser cooling has been widely used in fundamental physics, precision metrology, and quantum science. However, cooling certain lattice vibrations remains a challenge due to the complexity of solid structures. Researchers have successfully demonstrated Raman cooling in a two-dimensional semiconductor, opening up new possibilities for cooling and controlling phonons.
Article
Materials Science, Multidisciplinary
Ying Zhang, Yuxuan Hou, He Zheng, Ligong Zhao, Shuangfeng Jia, Kaixuan Li, Huayu Peng, Peili Zhao, Lei Li, Weiwei Meng, Renhui Jiang, Jianbo Wang
Summary: This study systematically investigates the effects of twin boundary orientation and spacing on the deformation mechanisms in nickel nanowires. The findings demonstrate that twin boundaries play distinct roles in the mechanical deformations of face-centered-cubic nanowires.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2023)
Article
Materials Science, Multidisciplinary
Ligong Zhao, Guoxujia Chen, He Zheng, Shuangfeng Jia, Kaixuan Li, Renhui Jiang, Lei Li, Ying Zhang, Huayu Peng, Peili Zhao, Ziyang Huang, Jianbo Wang
Summary: By conducting in situ tensile experiments, this study reveals the strong influence of size on twinning behaviors and twin boundary-dislocation interaction mechanisms in body-centered cubic iron nanowires. Above a critical diameter of approximately 2.5 nm, deformation twinning dominates plasticity instead of dislocation slip. Isosceles twin boundaries mediated by 1/12 < 111 > partial dislocations are consistently observed. Two distinct twin boundary-related deformation mechanisms, twin variant re-orientation and twin boundary cracking, are uncovered for nanowires with diameters below and above 17 nm, respectively. Molecular dynamics and statics simulations provide the underlying mechanisms for size-dependent plasticity, which have been overlooked in previous experimental investigations. These findings emphasize the importance of grain size in mediating deformation behaviors in iron and offer possible guidance for optimizing the mechanical performance of single-crystalline and poly-crystalline iron-based materials, such as steel.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2023)
Article
Chemistry, Physical
Yang Chen, Jiangang Feng, Yuqing Huang, Weijin Chen, Rui Su, Sanjib Ghosh, Yi Hou, Qihua Xiong, Cheng-Wei Qiu
Summary: This study demonstrates the realization of compact spin-valley-locked perovskite emitting metasurfaces with pure circular polarization, high directionality, and large emission angles by imparting spin-dependent geometric phases through Brillouin zone folding.
Article
Multidisciplinary Sciences
M. Iqbal Bakti Utama, Hongfei Zeng, Tumpa Sadhukhan, Anushka Dasgupta, S. Carin Gavin, Riddhi Ananth, Dmitry Lebedev, Wei Wang, Jia-Shiang Chen, Kenji Watanabe, Takashi Taniguchi, Tobin J. Marks, Xuedan Ma, Emily A. Weiss, George C. Schatz, Nathaniel P. Stern, Mark C. Hersam
Summary: The authors use a chemomechanical approach to modify single-photon emitters (SPEs) in monolayer WSe2 by combining localized mechanical strain with noncovalent surface functionalization, resulting in the simplification of complex defect-related emission into isolated SPEs with high single-photon purity.
NATURE COMMUNICATIONS
(2023)
Article
Nanoscience & Nanotechnology
Shuai Zhang, Zhuoya Zhu, Wenna Du, Xianxin Wu, Sanjib Ghosh, Qing Zhang, Qihua Xiong, Xinfeng Liu
Summary: Exciton polariton condensation in an annular potential landscape can be controlled by an external field, resulting in rotational polariton flow with different orbit indexes. By using ring-shaped pumping in a planar perovskite microcavity, linear coupled counter-rotating polariton states and a vortex pairs-petal state have been demonstrated. The diameter of the pumping ring and the detuning energy can control the azimuthal indices and flowing velocity of the polaritons.
Article
Nanoscience & Nanotechnology
Meiying Leng, Jinqi Wu, Kevin Dini, Jing Liu, Zehua Hu, Jiang Tang, Timothy C. H. Liew, Handong Sun, Rui Su, Qihua Xiong
Summary: Lead halide perovskites have made significant progress in high-efficiency light-emitting diodes (LEDs) and are ideal for strong exciton-photon coupling. However, achieving exotic phenomena such as polariton lasing and polariton LEDs in perovskite electroluminescent microcavities at room temperature remains a challenge. In this study, we demonstrate room-temperature strong coupling in a perovskite LED structure, with the best device exhibiting a current efficiency of 4.5 cd/A and an external quantum efficiency of 1.4% with anticrossing behavior via optical pumping. Our approach offers a new strategy for exploring ultrafast LEDs and electrically pumped perovskite lasing.
Article
Multidisciplinary Sciences
Jinqi Wu, Sanjib Ghosh, Yusong Gan, Ying Shi, Subhaskar Mandal, Handong Sun, Baile Zhang, Timothy C. H. Liew, Rui Su, Qihua Xiong
Summary: Unlike conventional lasers, topological lasers can emit coherent light in the presence of disorders and defects due to their nontrivial band topology. Exciton polariton topological lasers, which have the unique property of not requiring population inversion, are a promising platform for low-power consumption. In this study, we experimentally demonstrate the realization of topological corner states and achieve polariton corner state lasing with a low threshold at room temperature using a perovskite polariton system. This achievement opens up possibilities for on-chip active polaritonics using higher-order topology.
Article
Chemistry, Multidisciplinary
Nicholas Dale, M. Iqbal Bakti Utama, Dongkyu Lee, Nicolas Leconte, Sihan Zhao, Kyunghoon Lee, Takashi Taniguchi, Kenji Watanabe, Chris Jozwiak, Aaron Bostwick, Eli Rotenberg, Roland J. Koch, Jeil Jung, Feng Wang, Alessandra Lanzara
Summary: Using ARPES, the effects of many-body interactions and displacement field on the band structure of twisted bilayer graphene (tBG) devices at an intermediate (3 degrees) twist angle are studied. The observed renormalization of bands at the K points suggests the influence of moire models of the Hartree-Fock interaction. Evidence of correlation-enhanced inversion symmetry-breaking, shown as tunable gaps at the Dirac points, suggests a new approach to engineering band structure and symmetry-breaking phases in moire heterostructures.
Article
Chemistry, Multidisciplinary
Yin Liang, Yingjie Jiang, Ke-Zhao Du, Yang-Peng Lin, Xinyuan Ma, Daping Qiu, Ziyu Wang, Yanglong Hou, Xiaoding Wei, Qing Zhang
Summary: Zero-dimensional organic-inorganic metal halide hybrids have been studied to explore pressure engineering of electron-phonon coupling and self-trapped exciton emission at the molecular level. However, the low stiffness of inorganic clusters limits their reversible tuning of physical properties. In this study, a Sb3+-doped metal halide with high emission yield and bulk modulus was designed, allowing for reversible and enhanced self-trapped exciton emission under pressure. These findings provide insights into the structure-property relationship and molecular engineering of zero-dimensional metal halides for wide-band and pressure-sensitive light sources.
Article
Chemistry, Multidisciplinary
Yuzhong Chen, Ying Shi, Yusong Gan, Haiyun Liu, Tengfei Li, Sanjib Ghosh, Qihua Xiong
Summary: Exciton polaritons at room temperature exhibit ultrafast coherent dynamics with high propagation speed and longer coherence time than previously believed.
Article
Multidisciplinary Sciences
Fuyang Liu, Peng Zhou, Yanghui Hou, Hao Tan, Yin Liang, Jialiang Liang, Qing Zhang, Shaojun Guo, Meiping Tong, Jinren Ni
Summary: Solar-driven photosynthesis is a sustainable process for hydrogen peroxide production. Optimizing the intramolecular polarity of COFs greatly boosts H2O2 photosynthesis from water, air, and sunlight without sacrificial agents. This process has potential applications in water decontamination using tap, river, or sea water with natural sunlight and air.
NATURE COMMUNICATIONS
(2023)
Article
Optics
Yuan Luo, Quanbing Guo, Xinyi Deng, Sanjib Ghosh, Qing Zhang, Hongxing Xu, Qihua Xiong
Summary: We demonstrate the manipulation and prolongation of nonlinear polaritons by creating fully deterministic potential wells with lithographic mesas to trap polaritons in a monolayer WS2 microcavity. By varying the trapping sizes, the interaction strength between polariton and exciton is enhanced by about six times through managing their spatial overlap. Moreover, the coherence of trapped polaritons is significantly improved due to the spectral narrowing and can be tailored within a picosecond range. Therefore, this work provides a convenient approach to manipulate the nonlinearity and coherence of polaritons, and opens up possibilities for exploring many-body phenomena and developing novel polaritonic devices based on 2D materials.
LIGHT-SCIENCE & APPLICATIONS
(2023)
Review
Nanoscience & Nanotechnology
Jinshuai Zhang, Jiepeng Song, Qing Zhang
Summary: Metal halide perovskite polycrystalline films have shown significant advancements in high-performance optoelectronic devices, with the potential to improve efficiency and commercialization. However, perovskite single crystals are more promising due to their longer carrier diffusion lengths, extended carrier lifetimes, and enhanced carrier mobility. Various methods have been developed for synthesizing large-scale perovskite single crystals and patterning their surfaces.