A5050301336- Perovskite Materials and Applications
- Quantum Dots Synthesis And Properties
- Chalcogenide Semiconductor Thin Films
- Graphene research and applications
- 2D Materials and Applications
- Photocathodes and Microchannel Plates
- Quantum and electron transport phenomena
- Radiation Detection and Scintillator Technologies
- Conducting polymers and applications
- Ga2O3 and related materials
- Topological Materials and Phenomena
- Electron and X-Ray Spectroscopy Techniques
- Advanced Semiconductor Detectors and Materials
- Mechanical and Optical Resonators
- Nanowire Synthesis and Applications
- Acoustic Wave Resonator Technologies
- X-ray Diffraction in Crystallography
- Electronic and Structural Properties of Oxides
- Semiconductor Quantum Structures and Devices
- Semiconductor materials and devices
- MXene and MAX Phase Materials
- Gyrotron and Vacuum Electronics Research
- Advanced MEMS and NEMS Technologies
- Gas Sensing Nanomaterials and Sensors
- Atomic and Subatomic Physics Research
Zhuhai Institute of Advanced Technology
2024-2025
Beijing Institute of Technology
2021-2025
Los Alamos National Laboratory
2016-2022
Purdue University West Lafayette
2022
Sandia National Laboratories
2022
Center for Integrated Nanotechnologies
2020-2021
United States Naval Research Laboratory
2017-2018
Max Planck Institute for Physics
2018
Argonne National Laboratory
2018
Naval Research Laboratory Materials Science and Technology Division
2018
We present the photodetection properties of graphene/Si heterojunctions both in photocurrent and photovoltage modes. Monolayer junctions were found to be excellent weak-signal detectors with responsivity exceeding 10(7) V/W noise-equivalent-power reaching ∼1 pW/Hz(1/2), potentially capable distinguishing materials transmittance, T = 0.9995 a 0.5 s integration time. In mode, response was remain linear over at least six decades incident power (P), tunable up 435 mA/W (corresponding photon...
Abstract 2D Ruddlesden–Popper (RP) perovskites have recently emerged as promising candidates for hybrid perovskite photovoltaic cells, realizing power‐conversion efficiencies (PCEs) of over 10% with technologically relevant stability. To achieve solar cell performance comparable to the state‐of‐the‐art 3D it is highly desirable increase conductivity and lower optical bandgap enhanced near‐IR region absorption by increasing slab thickness. Here, use higher member ( n = 5) RP ‐butyl‐NH 3 ) 2...
Hybrid perovskites are on a trajectory toward realizing the most efficient single-junction, solution-processed photovoltaic devices. However, critical issue is limited understanding of correlation between degree crystallinity and emergent perovskite/hole (or electron) transport layer device performance photostability. Here, controlled growth hybrid nickel oxide (NiO) shown, resulting in formation thin films with enhanced characteristic peak width splitting reminiscent tetragonal phase single...
Solution-processed 2D perovskite diodes with fully depleted junction enable highly sensitive and robust thin-film x-ray detectors.
Detecting hard X-rays and γ-rays with high energy resolution is critical for medical industrial applications, high-energy fundamental physics, homeland security. Two types of radiation detectors, indirect-conversion (scintillators) direct-conversion (solid-state) are the most widely used technologies. Semiconductor-based detectors that can directly convert into an electrical signal operate at room temperature especially important as portable cost-efficient sensitivity resolution. Recently,...
The ability to synthesize high-quality samples over large areas and at low cost is one of the biggest challenges during developmental stage any novel material. While chemical vapor deposition (CVD) methods provide a promising low-cost route for CMOS compatible, large-scale growth materials, it often falls short demands in nanoelectronics optoelectronics. We present CVD synthesis single- few- layered MoS2 using direct vapor-phase sulfurization MoO2, which enables us obtain extremely...
In an earlier work, we had reported a method that enables graphene-silicon junctions to display exceptionally high photovoltaic responses, exceeding 10(7) V/W. Using completely different has recently been result in ultrahigh gain, now show these can also demonstrate giant photocurrent responsivities approach ∼ A/W. Together, mechanisms enable be dual-mode, broad-band, scalable, CMOS-compatible, and tunable photodetector operate either photovoltage or modes with responsivity values. We...
Fabricating perovskite films with a dominant crystal orientation is an effective path to realizing quasi-single-crystal film, which can eliminate the fluctuation of electrical properties in arising from grain-to-grain variations, and improve performance solar cells (PSCs). Perovskite (FAPbI3 ) based on one-step antisolvent methods usually suffer chaotic orientations due inevitable intermediate phase conversion intermediates PbI2 •DMSO, FA2 Pb3 I8 •4DMSO, δ-FAPbI3 α-FAPbI3 . Here,...
Quantum dot (QD) based light-emitting diodes (QLEDs) hold great promise for next-generation lighting and displays. In order to reach a wide color gamut, deep red QLEDs emitting at wavelengths beyond 630 nm are highly desirable but have rarely been reported. Here, we synthesized ZnCdSe/ZnSeS QDs (diameter ∼16 nm) with continuous gradient bialloyed core-shell structure. These exhibit high quantum yield, excellent stability, reduced hole injection barrier. The on an external efficiency above...
Abstract Perovskite films with large crystal size, preferred orientation, and facile fabrication process, combining advantages of single‐crystal polycrystalline films, have gained considerable attention recently. However, there is little research on the facet properties perovskite films. Here, (111)‐ (001)‐oriented bandgaps ranging from 1.53 to 1.77 eV, systematically investigated their orientation‐dependent are achieved. The (111)‐oriented show electron‐dominated traps hole‐dominated traps,...
The use of micro-/nanoelectromechanical resonators for the room temperature detection electromagnetic radiation at infrared frequencies has recently been investigated, showing thermal capabilities that could potentially outperform conventional microbolometers. scaling device thickness in nanometer range and achievement high absorption such a subwavelength thickness, without sacrificing electromechanical performance, are two key challenges implementation fast, high-resolution resonant...
Colloidal semiconductor nanocrystals (NCs) attract significant interest in recent years due to their narrow and tunable emission wavelength the visible range, as well high photoluminescence quantum yield (PLQY), which are highly desired display technologies. The high-quality NCs have been recognized vital luminescent materials realizing next-generation devices. With further development, with near-unity PLQY successfully synthesized through engineering of core/shell heterostructure. However,...
In recent times, atomically thin alloys of boron, nitrogen, and carbon have generated significant excitement as a composition-tunable two-dimensional (2D) material that demonstrates rich physics well application potentials. The possibility tunably incorporating oxygen, group VI element, into the honeycomb sp(2)-type 2D-BNC lattice is an intriguing idea from both fundamental applied perspectives. We present first report on quaternary alloy carbon, oxygen (2D-BNCO). Our experiments suggest,...
Designing "ideal electrodes" that simultaneously guarantee low mechanical damping and electrical loss as well high electromechanical coupling in ultralow-volume piezoelectric nanomechanical structures can be considered to a key challenge the NEMS field. We show mechanically transferred graphene, floating at van der Waals proximity, closely mimics for ultrahigh frequency (0.2 GHz < f0 2.6 GHz) nanoelectromechanical resonators with negligible mass interfacial strain perfect radio electric...
Thiol-epoxy "click" chemistry is employed for the first time to engineer a new cytocompatible PEG-based hydrogel system in aqueous media with ability encapsulate human mesenchymal stem cells (hMSCs) and control their fate tissue regeneration. Cells were easily encapsulated into hydrogels exhibited high cell viability over 4 weeks of culture regardless presence siRNA, complexed polyethylenimine (PEI) form siRNA/PEI nanocomplexes, indicating biocompatibility developed hydrogel. Loading...
Abstract InP‐based quantum dots (QDs) are one of the most promising heavy‐metal‐free materials for light‐emitting applications to substitute cadmium‐analogous QDs. With a bulk band gap 1.35 eV, InP QDs can be made emit light in deep red and even near‐infrared region by adjusting size. Deep‐red diodes (LEDs) great interest promoting growth plants accurate LED displays. However, synthesis fabrication quantum‐dot LEDs (QLEDs) emitting still under development. Here, study reports deep‐red...
The external quantum efficiency (EQE) in light-emitting diodes (LEDs) based on isotropic dots has approached the theoretical limit of close to 20%. Anisotropic nanorods can break this by taking advantage their directional emission. However, progress towards higher EQE using CdSe/CdS (NRs) faces several challenges, primarily involving low yield and unbalanced charge injection devices. Herein, seeded growth method is modified anisotropic are obtained with photoluminescence up 98% coating a...
Anisotropic nanocrystals such as nanorods (NRs) display unique linearly polarized emission, which is expected to break the external quantum efficiency (EQE) limit of dot-based light-emitting diodes (LEDs). However, progress in achieving a higher EQE using NRs encounters several challenges, primarily involving low photoluminescence yield (PLQY) and imbalanced charge injection NR-LEDs. In this work, we investigated NR-LEDs based on CdSe/CdZnS/ZnS rod-in-rod with high PLQY linear polarization...
Heterocrystals: rotationally oriented stacks of incommensurate 2D materials with tunable and laser-reconfigurable properties.
Bismuth selenide (Bi2Se3) is a 3D topological insulator, its strong spin-orbit coupling resulting in the well-known topologically protected coexistence of gapless metallic surface states and semiconducting bulk with band gap, Eg ≃ 300 meV. A fundamental question considerable importance how electronic properties this material evolve under nanoscale confinement. We report on catalyst-free, high-quality single-crystalline Bi2Se3 controlled lateral sizes layer thicknesses that could be tailored...
Tailoring band alignment layer-by-layer using heterojunctions of two-dimensional (2D) semiconductors is an attractive prospect for producing next-generation electronic and optoelectronic devices that are ultrathin, flexible, efficient. The 2D layers transition metal dichalcogenides (TMDs) in laboratory have already shown favorable characteristics applications. Despite these strides, a systematic understanding how evolves from monolayer to multilayer structures still lacking experimental...