A5033624305- 2D Materials and Applications
- Perovskite Materials and Applications
- Graphene research and applications
- MXene and MAX Phase Materials
- Semiconductor Quantum Structures and Devices
- Advanced Memory and Neural Computing
- Photonic and Optical Devices
- Strong Light-Matter Interactions
- X-ray Diffraction in Crystallography
- Nanowire Synthesis and Applications
- Crystallization and Solubility Studies
- Diamond and Carbon-based Materials Research
- CCD and CMOS Imaging Sensors
- Ga2O3 and related materials
- Chalcogenide Semiconductor Thin Films
- Quantum and electron transport phenomena
- Optical properties and cooling technologies in crystalline materials
- Infrared Target Detection Methodologies
- Carbon Nanotubes in Composites
- Advancements in Semiconductor Devices and Circuit Design
- Plasmonic and Surface Plasmon Research
- Solid State Laser Technologies
- Advanced ceramic materials synthesis
- Ferroelectric and Negative Capacitance Devices
- Photonic Crystal and Fiber Optics
École Polytechnique Fédérale de Lausanne
2025
Chinese Academy of Sciences
1999-2024
Xijing University
2024
Heriot-Watt University
2021-2024
Nanyang Technological University
2016-2023
ShanghaiTech University
2020-2022
Nanjing Tech University
2022
Northwestern Polytechnical University
2022
Southwest Jiaotong University
2022
Fudan University
2022
Identifying two-dimensional layered materials in the monolayer limit has led to discoveries of numerous new phenomena and unusual properties. We introduced elemental silicon during chemical vapor deposition growth nonlayered molybdenum nitride passivate its surface, which enabled centimeter-scale films MoSi2N4 This was built up by septuple atomic layers N-Si-N-Mo-N-Si-N, can be viewed as a MoN2 layer sandwiched between two Si-N bilayers. material exhibited semiconducting behavior (bandgap...
Abstract The challenges of developing neuromorphic vision systems inspired by the human eye come not only from how to recreate flexibility, sophistication, and adaptability animal systems, but also do so with computational efficiency elegance. Similar biological these circuits integrate functions image sensing, memory processing into device, process continuous analog brightness signal in real-time. High-integration, flexibility ultra-sensitivity are essential for practical artificial that...
Despite the fascinating Li storage properties of organic carbonyl compounds, e.g., high therotical capacity and fast kinetics, it is still lack a facile effective way that capable large‐scale producion advanced cathodes for Li‐ion batteries (LIBs). Here, generic strategy proposed by combining sonication hydrothermal techniques scalable synthesis performance LIBs. A series commercialized vat dyes with abundant electroactive conjugated groups are confined in between graphene layers, forming...
The emerging field of valleytronics has boosted intensive interests in investigating and controlling valley polarized light emission monolayer transition metal dichalcogenides (1L TMDs). However, so far, the effective control polarization degree TMDs semiconductors is mostly achieved at liquid helium cryogenic temperature (4.2 K), with requirements high magnetic on-resonance laser, which are cost unwelcome for applications. To overcome this obstacle, it depicted that by electrostatic optical...
The fundamental properties of an exciton are determined by the spin, valley, energy, and spatial wavefunctions Coulomb-bound electron hole. In van der Waals materials, these attributes can be widely engineered through layer stacking configuration to create highly tunable interlayer excitons with static out-of-plane electric dipoles, at expense strength oscillating in-plane dipole responsible for light-matter coupling. Here we show that in bi- tri-layer 2H-MoSe2 crystals exhibit...
Chirality, a basic property of symmetry breaking, is crucial for fields such as biology and physics. Recent advances in the study chiral systems have stimulated interest discovery symmetry-breaking states that enable exotic phenomena spontaneous gyrotropic order superconductivity. Here we examine interaction between light chirality electron spins indium selenide effect magnetic field on emerging tunnelling photocurrents at Van Hove singularity. Although symmetric under linearly polarized...
Abstract Two-dimensional (2D) materials are promising for next-generation photo detection because of their exceptional properties such as a strong interaction with light, electronic and optical that depend on the number layers, ability to form hybrid structures. However, intrinsic 2D material-based photodetectors is low due atomic thickness. Photogating widely used improve responsivity devices, which usually generates large noise current, resulting in limited detectivity. Here, we report...
Abstract Nanocrystallization is a well-known strategy to dramatically tune the properties of materials; however, grain-size effect graphene at nanometer scale remains unknown experimentally because lack nanocrystalline samples. Here we report an ultrafast growth films within few seconds by quenching hot metal foil in liquid carbon source. Using Pt and ethanol as examples, four kinds with average grain size ~3.6, 5.8, 8.0, 10.3 nm are synthesized. It found that boundary becomes more...
Abstract Van der Waals heterostructures of transition metal dichalcogenides with interlayer coupling offer an exotic platform to realize fascinating phenomena. Due the type II band alignment these heterostructures, electrons and holes are separated into different layers. The localized induced doping in one layer, principle, would lift Fermi level cross spin-polarized upper conduction lead strong manipulation valley magnetic response. Here, we report significantly enhanced Zeeman splitting...
Abstract Monochiral single‐walled carbon nanotubes (SWCNTs) are promising materials with potential applications in 3D integrated circuits and optoelectronic hybrid circuits. However, the purity device performance of monochiral SWCNTs still far lower than expected. Here, authors demonstrate that specific can be wrapped by conjugated polymers containing pyridine units, supramolecular assemblies show surprising suspension stability even after high‐intensity ultracentrifugation. Additionally,...
Hot-carrier transistors are a class of devices that leverage the excess kinetic energy carriers. Unlike regular transistors, which rely on steady-state carrier transport, hot-carrier modulate carriers to high-energy states, resulting in enhanced device speed and functionality. These characteristics essential for applications demand rapid switching high-frequency operations, such as advanced telecommunications cutting-edge computing technologies
Abstract Metallic layered transition metal dichalcogenides (TMDs) host collective many‐body interactions, including the competing superconducting and charge density wave (CDW) states. Graphene is widely employed as a heteroepitaxial substrate for growth of TMD layers an ohmic contact, where graphene/TMD heterostructure naturally formed. The presence graphene can unpredictably influence CDW order in 2D conductors. This work reports transitions 2H‐NbSe 2 graphene/NbSe heterostructures....
Two-dimensional (2D) layered lead halide perovskites with large exciton binding energies, efficient radiative recombination, and outstanding environmental stability are regarded as supreme candidates for realizing highly compact ultralow threshold lasers. However, continuous-wave (CW) pumped lasing of 2D perovskites, the precondition electrically lasing, is still challenging. Here, we tackled this challenge by demonstrating emission in phenylethylammonium iodide [(PEA)2PbI4] embedded a...
Abstract Lead halide perovskites are intriguing semiconductors for lasers due to high quantum yield, tunable bandgaps, and facile solution‐process ability. However, limited by the weak optical confinement, continuous‐wave (CW) pumped lasing, as one prerequisite electrically is still challenging in bare lead without high‐quality factor ( Q ) artificial cavity. Herein, lasing emission methylammonium tribromide (MAPbBr 3 incorporated with a vertical microcavity under continuous pumping at 80 K...
We have successfully fabricated a high- Q vertical-cavity surface-emitting laser (VCSEL) using CsPbBr 3 QDs, achieving room-temperature lasing with low threshold of 8.8 W cm −2 , demonstrating excellent stability even after year.
Abstract Recently, organic–inorganic lead iodide perovskite has become one of the most promising emergent materials, which exhibits great potential in photovoltaics, lasing, laser cooling, etc. The building block such material is PbI 2 , a van der Waals (vdW) layered semiconductor material, arouses increased interest also owing to its applications for X‐ray and γ‐ray detection, Similar even superior some vdW materials as thin layers transition metal dichalcogenides like MoS WS MoSe or WSe...
For filamentary resistive random-access memory (RRAM) devices, the switching behavior between different resistance states usually occurs abruptly, while random formation of conductive filaments results in large fluctuations states, leading to poor uniformity. Schottky barrier modulation enables through charge trapping/de-trapping at top-electrode/oxide interface, which is effective for improving uniformity RRAM devices. Here, we report a uniform device based on MXene-TiO2 junction. The...
As an indicator of the optical characteristics perovskite materials, band gap is a crucial parameter that impacts functionality wide range optoelectronic devices. Obtaining material via labor-intensive, time-consuming, and inefficient high-throughput calculation based on first principles possible. However, it does not yield most accurate results. Machine learning techniques emerge as viable effective substitute for conventional approaches in prediction. This paper collected 201 pieces data...