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Introduction
Publications
Publications (124)
The built-in electric field is enhanced by coupling a 2D PtSe 2 thin film and a graphene/Si Schottky junction, and the double-heterojunction device shows better photodetection performance under near-infrared illumination.
Two-dimensional (2D) materials are at the forefront of innovation, heralding a new era for next-generation electronics and optoelectronics. These materials are distinguished by their unique structural characteristics: they have no hanging bonds on their surface, exhibit weakened electrostatic shielding in the Z-direction, and boast atomic thickness...
Over the past 70 years, the semiconductor industry has undergone transformative changes, largely driven by the miniaturization of devices and the integration of innovative structures and materials. Two-dimensional (2D) materials like transition metal dichalcogenides (TMDs) and graphene are pivotal in overcoming the limitations of silicon-based tech...
The demand for photodetectors and image sensors has grown exponentially in the past decade in biomedical, security surveillance, robotics, automotive, quality control, image recognition, and military applications, due to their superior quality, broadband detection, lower noise, and economic viability. Here, we report a MoS2 channel-based phototrans...
There are great interests in the incorporation of novel two-dimensional materials into Si-based technologies to realize multifunctional optoelectronic devices via heterogeneous integration. Here, we demonstrate a gate-tunable, self-driven, high-performance broadband...
Two-dimensional (2D) PdSe2 film has the characteristics of adjustable bandgap, high carrier mobility, and high stability. Photodetector (PD) based on 2D PdSe2 exhibits wide spectral self-driving features, demonstrating enormous potential in the field of optical detection. Here, we design and fabricate PdSe2/Si heterojunction PDs with various thickn...
The demand for charge‐coupled device (CCD) imagers has surged exponentially during the last decade owing to their exceptionally high quality and low noise imaging. However, they are still confronting the performance constraints of high operation power, low speed, and limited charge integration. Here, the electric‐dipole gated phototransistor operat...
Two-dimensional (2D) materials are being intensively exploited for broadband-responsive photodetectors (PDs). However, the broadband-responsive PDs based on 2D materials normally suffer from poor response to infrared wavelengths. Here, we report the excellent photoresponse performance of vertical PtSe2/ultrathin Al2O3/Ge PD under near-infrared illu...
Two-dimensional (2D) layered materials have attracted extensive research interest in the field of high-performance photodetection due to their high carrier mobility, tunable bandgap, stability, and other excellent properties. Herein, we propose a gate-tunable, high-performance, self-driving, and wide detection range phototransistor based on a 2D Pt...
2D magnetic materials have been attracting enormous interest for both fundamental research and potential spintronic applications. Here, this work demonstrates the van der Waals epitaxial growth of air‐stable 2D magnetic CrS2 on mica substrate by chemical vapor deposition (CVD). The layered nature, high crystallinity, stoichiometry, and high‐purity...
Photodetectors (PDs) based on two-dimensional (2D) materials are attracting considerable research interest due to the unique properties of 2D materials and their tunable spectral response. However, their performance is not outstanding enough, and the compatibility of their fabrication process with Si-complementary metal oxide semiconductor (CMOS) p...
Correction for ‘Interlayer exciton emission in a MoS 2 /VOPc inorganic/organic van der Waals heterostructure’ by Yuhan Kong et al. , Mater. Horiz. , 2022, DOI: 10.1039/d1mh01622a.
Heterostructures built from two-dimensional (2D) materials and organic semiconductors offer a unique platform for addressing many fundamental physics and construction of functional devices by taking advantage of both the 2D materials and organic semiconductors. We report interlayer exciton emission in the near infrared range around 1.54 eV (∼805 nm...
2D semiconductors are attracting increasing interest owing to their promising applications in high‐performance photodetection. However, the spectral response window is dictated by their intrinsic bandgaps, which is typically narrow and severely hinders their applications as broadband photodetectors. Herein, taking advantage of the outstanding optoe...
Two-dimensional (2D) magnetism is now the attention of central demands in fundamental condensed matter physics concerning about the understanding and control of new phases. The demonstration of ferromagnetism in an atomically thin layer develops the prospects for a variety of device applications of 2D van der Waals (vdW) materials. The long-range f...
Due to the fascinating optoelectronic properties of two-dimensional (2D) transition metal dichalcogenides (TMDs) and the flexible nature, vast library, and easy fabrication process of organic molecules, the combination of 2D TMD materials and organic molecules have been gaining enormous attention in recent years. The organic semiconductors can enha...
Large polymer residues introduced by the graphene transfer process is still a major obstacle limiting the integration of chemical vapor deposition (CVD)-grown graphene into next-generation electronic and photoelectronic devices. Here we use cera alba, a natural and environmental-friendly material that derives from honeycomb, as the supporting layer...
The asymmetric capacitors are one of the energy storage systems that provide high energy density and high power density. However, there are some limitations which impede the development of asymmetric capacitors. In this context, we designed a new type of lithium-selenium asymmetric capacitor (LSEC) that has both the capacitive effect and the diffus...
Heterostructures built from 2D materials and organic semiconductors offer a unique platform for addressing many fundamental physics and construction of functional devices. Interfaces play a crucial role in tailoring the heterostructure properties. Here, density functional theory computations are performed to explore the interfacial properties of he...
synaptic device
Synaptic devices for neuromorphic computing have been recently on the fast track of development. One of the most prominent features of synaptic devices is their potentially ultra-low energy consumption. However, relatively large energy has always been consumed to induce the postsynaptic current (PSC) of a synaptic device up to now. Here, we demonst...
Transition metal sulfides are widely used in energy storage and conversion due to their exclusive physical and chemical performance. In this work, FeSx/C/CNT composites have been prepared by spray drying assisted and then calcined in an Ar atmosphere. As lithium-ion battery anodes and electrode material for supercapacitor, the FeSx/C/CNT composites...
Cu2S is considered as one of the potential anode paradigms for advanced rechargeable batteries because of its high theoretical capacity (~335mAh·g-1), high and flat charge/discharge voltage plateaus (~1.7 V vs Li+/Li), stable cycling performance as well as its elemental abundance. However, many researches have shown that Cu2S exhibits a dramatic ca...
Heterogeneous atoms doping has been proven as an efficient route to tune the physical and chemical properties of semiconductors, represented by the technically mature boron and phosphorus doping in bulk silicon. In the two-dimensional (2D) transitional metal dichalcogenides (TMDs) semiconductors, substitutional doping dominates compared with the in...
Combination of perylene derivatives and MoS2 exhibit contrasting photoluminescence (PL) behavior. The intense PL emission exhibits in PTCDA/MoS2 while quenching in PTCDI‐Ph/MoS2. The observed giant PL enhancement of PTCDA/MoS2 is due to the reduced bandgap, large exciton/trion ratio, and ordered morphology of PTCDA. The results can stimulate optoel...
Liquid-phase exfoliated graphene sheets are promising candidates for printing electronics. Here, a high-performance printed 2.4 GHz graphene-based antenna is reported. Graphene conductive ink prepared by using liquid-phase exfoliation process is printed onto a water-transferable paper by using blade printing technique, which is then patterned as di...
The contrasting photoluminescence (PL) emission behavior of molybdenum disulfide‐organic perylene derivative (PDI/MoS2) based type‐II heterostructures—PTCDA/MoS2 and PTCDI‐Ph/MoS2—is explored. The significant PL enhancement is exhibited in PTCDA/MoS2 while PL quenching is observed in PTCDI‐Ph/MoS2. The intense PL emission of PTCDA/MoS2 is due to re...
The commercialization of sulfur cathodes has encountered several problems, including migration of polysulfide intermediates, low conductivity of sulfur and its discharge products, and volumetric changes in the cathode. To alleviate these problems, researchers have proposed a number of strategies, such as porous carriers, polysulfides sorbents, cata...
Two-dimensional (2D) Cr-based layered and non-layered materials such as CrI3, Cr2Ge2Te6, Cr2S3, CrSe, and CrOX (X=Cl, Br) have attracted considerable attention due to their potential application in spintronics. Despite few experimental study, theoretical studies reported that 2D chromium dichalcogenides (CrS2) materials show unique properties such...
Two-dimensional materials attract enormous research attentions owing to the fascinating properties and great potential applications in electronics, optoelectronics, spintronics, energy conversion, and storage. Among them, two-dimensional transitional metal dichalcogenides exhibit exceptional properties such as tunable bandgaps, phase transition, an...
The discovery of graphene in 2004 by Konstantin Novoselov and Andre Geim opened a new scientific arena: “2D materials”. The finding of new layered and non-layered materials and their potential applications in various fields has been taken a great attention in recent years. A wide variety of 2D materials such as transition metal dichalcogenides (TMD...
2D lead iodide (PbI2) is attracting great interest due to its great potential in the application of UV photodetectors. In this work, a facile solution‐based method is developed to synthesize ultraflat PbI2 nanoflakes for high‐performance UV photodetectors. By maintaining at proximate room temperature and adding an evaporation suppression solvent fo...
The quantum-dot light-emitting diodes
(QLEDs) that emit near-infrared (NIR) light may be important
optoelectronic synaptic devices for the realization of
artificial neural networks with complete optoelectronic integration.
To improve the performance of NIR QLEDs, we
take advantage of their low-energy light emission to explore
the use of poly(3-hexy...
The incorporation of augmentative functionalities into a single synaptic device is greatly desired to enhance the performance of neuromorphic computing, which has brain-like high intelligence and low energy consumption. This encourages the development of multi-functional synaptic devices with architectures that are capable of achieving demanded syn...
The quantum-dot light-emitting diodes (QLEDs) that emit near-infrared (NIR) light may be important optoelectronic synaptic devices for the realization of artificial neural networks with complete optoelectronic integration. To improve the performance of NIR QLEDs, we take advantage of their low-energy light emission to explore the use of poly(3-hexy...
Graphene synthesis by chemical vapor deposition (CVD) on Cu foil involves a series of complex interplays between the atmosphere and Cu substrate. The large number of topographical irregularities and impure elements existing in the normal Cu foils inevitably result in heterogeneous graphene nucleation and uncontrolled growth. Thus, resolving the mut...
Limited calculations show that monolayer (ML) chromium dichalcogenide (CrS2) has a direct bandgap and valley polarization but with a smaller bandgap than ML MoS2 and with distinct piezoelectric and ferromagnetic properties. It is highly desirable to determine an appropriate metal contact for novel two‐dimensional (2D) CrS2‐based devices. By using d...
We comprehensively studied the electrical, optical, and mechanical properties, and stability of the hybrid transparent conductive electrode (TCE) prepared by transferring graphene onto random silver nanowires (AgNW) on poly(ethylene terephthalate) (PET) substrates. Compared with the pristine AgNW TCE, the AgNW-graphene hybrid TCE was found to exhib...
The incorporation of light into synaptic devices for neuromorphic computing with low energy consumption and high intelligence is greatly inspired by the development of optogenetics in neuroscience. However, the use of light as the outputs of synaptic devices has not been demonstrated yet, impeding the full optoelectronic integration of artificial n...
Optically stimulated synaptic devices are critical to the development of neuromorphic computing with broad bandwidth and efficient interconnect. Although a few interesting materials have been employed to fabricate optically stimulated synaptic devices, the use of silicon (Si) that is the material of choice for very large-scale integration circuits...
We report the photoluminescence (PL) characteristics of van der Waals (vdW) heterojunction constructed by simply depositing organic semiconductor of 3, 4, 9, 10-perylene tetracarboxylic dianhydride (PTCDA) onto two-dimensional MoS2 monolayer. The crystallinity of PTCDA on MoS2 is significantly improved due to vdW epitaxial growth. We observe an enh...
Graphene has attracted intense research interest due to its extraordinary properties and great application potential. Various methods have been proposed for the synthesis of graphene, among which chemical vapor deposition has drawn a great deal of attention for synthesizing large-area and high-quality graphene. Theoretical understanding of the synt...
Efficient all-inorganic silicon-quantum-dot (Si-QD) near-infrared light-emitting diodes (LEDs) have been fabricated by using nickel oxide (NiO) and zinc oxide (ZnO) as the transport layers of holes and electrons, respectively. It is found that the LED performance may be significantly improved by the atomic layer deposition of an Al
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The technical advance of plasma enhanced chemical vapor deposition (PECVD) exhibits the potential to
grow large-area high-quality graphene films at relatively low growth temperature, which is beneficial to
the fabrication of graphene-based electronic devices/sensors and transparent electrode. However, it
remains a challenge to overcome the degradat...
Highly sensitive photodetection even approaching the single-photon level is critical to many important applications. Graphene-based hybrid phototransistors are particularly promising for high-sensitivity photodetection because they have high photoconductive gain due to the high mobility of graphene. Given their remarkable optoelectronic properties...
Transition metal dichalcogenides such as MoS2 and WS2 quantum dots (QDs) have been found to show a dramatic enhancement of photoluminescence (PL) quantum efficiency as compared with their planar sheet counterparts. However, the mechanisms of PL enhancement remain not to be very clear. In this work, MoSe2 QDs with the size ranging from about 5.30 nm...
Silver nanowires (AgNWs) and graphene are both promising candidates as transparent conductive electrode (TCE) to replace expensive and fragile indium tin oxide (ITO) TCE. A synergistically optimized performance is expected when the advantages of AgNWs and graphene are combined. In this paper, the AgNWs-graphene hybrid electrode is architectured by...
Atomically thin two-dimensional materials ranging from superconductor, metal, semiconductor to insulator are emerging as potential candidates for next-generation digital electronics and optoelectronic applications. The synthesis on a commonly used substrate and fast transfer to a plenty of desired substrates need to be addressed to meet the industr...
Graphene is an ideal membrane for selective separation because of its unique properties and single-layer structure. Considerable efforts have been exerted to alter the permeability of graphene. In this study, we investigate the pathways for an oxygen atom to pass through graphene sheets. We also identify the effect of ripple’s curvature in graphene...
Alloying with various compositions is an efficient method to tailor the optoelectronic properties of two-dimensional (2D) transition metal dichalcogenides (TMDs). However, the composition distribution in the monolayer of TMDs alloys lacks detailed investigation. Here, by exploring scanning Auger electron spectroscopy, we investigate the composition...
Graphene's practical applications require its reproducible production with controlled means. In particular, graphene synthesis by chemical vapor deposition on metals has been shown to be a promising way to produce large-size and high-quality graphene film at low cost. Understanding the reaction mechanisms during the synthesis process is vital for p...
Despite the technological importance of silicon quantum dots (Si QDs) which are solely made of abundant and nontoxic Si, Si-QD light-emitting diodes (LEDs) clearly lag behind those based on other QDs, especially Cd- or Pb-containing QDs. It is imperative that novel measures should be taken to boost the performance of Si-QD LEDs. Here we demonstrate...
Real graphene sheets show limited anti-permeation performance deviating from the ideally flat honeycomb carbon lattice that is impermeable to gases. Ripples in graphene are prevalent and they could significantly influence carrier transport. However, little attention has been paid to the role of ripples in the permeation properties of graphene. Here...
Graphene/silicon (Gr/Si) solar cells have triggered considerable interest for their potential in low-cost and high-efficiency photovoltaic applications. However, the performance of Gr/Si solar cells is still limited by poor Gr conductivity and carrier recombination at the interface. In this study, a solution-processable poly(3-hexylthiophene-2,5-di...
Solvents play a key part in synthesis, transfer, and device fabrication of two-dimensional (2D) materials. In article number 1600241, Yang Xu, Tawfique Hasan, and co-workers demonstrate solvent assisted soft-patterning of graphene heterostructures for high-performance photo detection. The solvent patterned graphene/Si Schottky photo detectors work...
Solvents are essential in synthesis, transfer, and device fabrication of 2D materials and their functionalized forms. Controllable tuning of the structure and properties of these materials using common solvents can pave new and exciting pathways to fabricate high-performance devices. However, this is yet to be materialized as solvent effects on 2D...
Solvents are essential in synthesis, transfer, and device fabrication of 2D materials and their functionalized forms. Controllable tuning of the structure and properties of these materials using common solvents can pave new and exciting pathways to fabricate high-performance devices. However, this is yet to be materialized as solvent effects on 2D...
The 0D–2D nucleation and growth mode is presented in molybdenum disulfide (MoS2) chemical vapor deposition synthesis. Partially sulfured molybdenum suboxide nucleation centers are demonstrated experimentally, followed by these centers being converted to MoS2 nanoparticles and MoS2 layer growth initiation from the nanoparticle edges. The work reveal...
Silicon dioxide (SiO2) is one of the key materials in many modern technological applications such as in metal oxide semiconductor transistors, photovoltaic solar cells, pollution removal, and biomedicine. We report the accidental discovery of free-standing grassy silica nanoribbons directly grown on SiO2/Si platform which is commonly used for field...
A facile and green method has been developed for the aqueous solution preparation of CuOX as an anode buffer layer for organic solar cells (OSCs).The CuOX buffer layer is prepared simply by spin-coating copper acetylacetonate precursor based aqueous solution onto ITO substrate at room temperature in ambient air. Hydrogen peroxide (H2O2) is used to...
MoS2 is widely used in many fields including spin-valleytronics, logic transistors, light emitting devices, clean energy and biology. However, controllable synthesis of two-dimensional MoS2 sheets remains a great challenge. We report the formation of round-shaped monolayer MoS2 domains with a tunable size and the shape transformation from triangle...
Hierarchical architecture of ultrathin interlayer-expanded WS2 nanosheets supported on three-dimensional graphene (3DG) frameworks is fabricated by a facile hydrothermal method for the first time. The 3DG frameworks could provide large surface area for assembling WS2 nanosheets and continuous pathways for rapid electron transfer and ion transport;...
Chemical vapor deposition on metal substrates using gaseous hydrocarbon as carbon feedstock has proven to be a feasible way for synthesis of large-area and uniform graphene films. Meanwhile, rearrangement of amorphous carbon species extracted from solid carbon sources into crystalline graphene not only offers an alternative route for graphene growt...
Nanoscale morphology is of significance to the electronic properties of semiconducting polymers. Solution-processed poly-3-hexylthiophene (P3HT) has been demonstrated as a promising active-layer material in organic thin film transistors (OTFTs) and solar cells. Controlling the crystallinity of P3HT chains is critical for gaining high-performance de...
Graphene nucleation at oxygen-rich Cu sites instead of on the commonly assumed pure Cu surface is discovered using high-spatial-resolution scanning Auger electron microscopy, which reveals a strong O signal existing underneath the graphene seeds, along with density functional theory calculations.
Two-dimensional layered WS2 sheets is used as the hole extraction layer (HEL) in organic solar cells (OSCs). We find that UV-ozone treatment of the chemically exfoliated WS2 sheets can significantly improve the device performance of the OSCs with the power conversion efficiency (PCE) of about 8.37%, which is comparable to the OSCs with the standard...
Graphene-silicon (Gr-Si) Schottky junction solar cell has been recognized as one of the most low-cost candidates in photovoltaics due to its simple fabrication process. However, the low Gr-Si Schottky barrier height largely limits the power conversion efficiency of Gr-Si solar cells. Here, we demonstrate that electric field doping can be used to tu...
When silicene is passivated by hydrogen, a bandgap occurs so that it becomes a semiconductor. Analogous to all the other semiconductors, doping is highly desired to realize the potential of hydrogen-passivated silicene (H-silicene). In the frame work of density functional theory (DFT), we have studied the doping of H-silicene with boron (B) and pho...
The limited intrinsic conductivity of two-dimensional (2D) MoS2 nanosheets compromises its high electrocatalytic performance. In this work, we develop a facile method of simply dispersing MoS2 nanosheets into a water?isopropanol solution of high-conducting single-walled carbon nanotubes (SWCNTs) for preparation of MoS2/SWCNT composites. The SWCNTs...