r e s e a r c h
Comprehensive characterization of 2D materials
We specialize in the comprehensive characterization of 2D materials and van der Waals heterostructures across their electrical, optical, mechanical, and magnetic properties. Using Atomic Force Microscopy (AFM), we conduct precise nano-mechanical analyses (e.g., suspended membrane strength, grain boundary friction) and investigate layer-dependent electronic properties, such as dielectric constants and work functions. By using power-, temperature-, and gate-dependent photoluminescence/electroluminescence spectroscopy, we observe complex excitonic dynamics and quantum confinement effects in tailored heterostructures. Additionally, we probe band structure variations and quantum transport phenomena under external electrostatic and high magnetic fields, while analyzing polarization-dependent anisotropy and intrinsic magnetic phase transitions. By elucidating these fundamental physical phenomena, our work paves the way for tailored applications in next-generation electronics, photonics, spintronics, and quantum computing.
Atomic-scale engineering and characterization of 2D materials and vdW heterostructures
We investigate the structural aspects and atomic-scale engineering of 2D materials, encompassing surface functionalization, phase transitions, and grain boundary analysis. Through selective chemical modification (e.g., fluorination/hydrogenation) and precision thermal/structural control, we manipulate layer-dependent crystal phases and atomic defects. We also probe twisted van der Waals heterostructures across various stacking configurations (R- and H-stacking) to engineer interlayer interactions. This includes resolving moiré-induced atomic reconstruction, domain boundary formation (AB/BA/SP domains), and non-volatile sliding ferroelectricity. By understanding these structural characteristics and developing interfacial modulation techniques, our research establishes a solid foundation for customizable 2D materials with tailored electronic, ferroelectric, and quantum functionalities.
Wafer-scale synthesis and advanced process engineering for 2D materials and vdW heterostructures
We specialize in the scalable growth and interfacial synthesis of 2D materials, utilizing chemical vapor deposition (CVD), van der Waals epitaxy, and template-directed hypotaxy. Our research explores fundamental growth kinetics, including salt-assisted CVD for domain control, epitaxial growth of ultrathin dielectric films, and graphene-templated hypotaxial growth that yields atom-precision TMD layers and innovative contact geometries. We also advance 3D patterning technologies through graphene origami and micro-etch masks. Additionally, we develop versatile fluorinated graphene template-assisted transfer and multi-stacking processes for oxide thin films, alongside twisted hypotaxy techniques for deterministic twist-angle control in vdW superlattices. These breakthroughs in wafer-scale synthesis and heterostructure fabrication provide essential materials platforms for advanced nanoelectronic, optoelectronic, and 3D integrated technologies.
Next-generation 2D electronics
We fabricate advanced electronic and optoelectronic devices utilizing van der Waals (vdW) heterostructures, spanning flexible, transparent, and multi-functional platforms. To maximize device efficiency, we develop novel integration schemes featuring low-resistance graphene edge/via contacts, schottky barrier (SB)-free interfaces, and work-function-tunable semimetal contacts. Our research emphasizes electrically controlled light-emitting transistors (LETs) and high-performance ferroelectric semiconductor FETs (FeS-FETs) employing sliding ferroelectricity and 2D ferroelectric channels, like indium selenides. Furthermore, we explore reconfigurable 2D transistors for in-memory computing and advance Monolithic 3D (M3D) integration, establishing foundational device architectures for next-generation logic, optoelectronics, and brain-inspired neuromorphic systems.
Advanced battery materials
We focus on advanced surface functionalization and interfacial engineering for high-performance Li-ion battery materials. We develop conformal CVD graphene coatings on both cathode (e.g., LMFP, NCM) and anode (Si-C composite) materials, significantly enhancing electrical conductivity and cycle life. Through gas-phase surface fluorination of NCM, we prevent Li ion leaching and metal dissolution, successfully facilitating stable water-based electrode manufacturing without current collector corrosion. In addition, we stabilize high-capacity silicon-based anodes by optimizing Si-Fe alloy fractions and porosity distributions to absorb strain during cycling. We also devlope nanoporous graphene filters for customized selective gas filtration. These integrated strategies drive innovations in high-energy, durable, and environmentally friendly battery architectures.