A5053815298- Perovskite Materials and Applications
- 2D Materials and Applications
- Transition Metal Oxide Nanomaterials
- Advanced Memory and Neural Computing
- Quantum Dots Synthesis And Properties
- Advanced Photocatalysis Techniques
- Chalcogenide Semiconductor Thin Films
- Ga2O3 and related materials
- Advanced Thermoelectric Materials and Devices
- Gas Sensing Nanomaterials and Sensors
- Electrocatalysts for Energy Conversion
- ZnO doping and properties
- Photoreceptor and optogenetics research
- Ferroelectric and Negative Capacitance Devices
- CCD and CMOS Imaging Sensors
- Solid-state spectroscopy and crystallography
- Graphene research and applications
- Coal Properties and Utilization
- Safety and Risk Management
- Neuroscience and Neural Engineering
- Geoscience and Mining Technology
- Advanced battery technologies research
- Thin-Film Transistor Technologies
- Technostress in Professional Settings
- Covalent Organic Framework Applications
City University of Hong Kong
2021-2024
Abstract Atomically 2D layered ferroelectric semiconductors, in which the polarization switching process occurs within channel material itself, offer a new platform that can drive electronic components toward structural simplification and high‐density integration. Here, room‐temperature semiconductor, bismuth oxychalcogenides (Bi 2 O Se), is investigated with thickness down to 7.3 nm (≈12 layers) piezoelectric coefficient (d 33 ) of 4.4 ± 0.1 pm V −1 . The random orientations electrically...
The incapability of modulating the photoresponse assembled heterostructure devices has remained a challenge for development optoelectronics with multifunctionality. Here, gate-tunable and anti-ambipolar phototransistor is reported based on 1D GaAsSb nanowire/2D MoS2 nanoflake mixed-dimensional van der Waals heterojunctions. resulting heterojunction shows apparently asymmetric control over transfer characteristics, possessing potential to implement electronic functions in logic circuits....
Chemical bonds, including covalent and ionic endow semiconductors with stable electronic configurations but also impose constraints on their synthesis lattice-mismatched heteroepitaxy. Here, the unique multi-scale van der Waals (vdWs) interactions are explored in one-dimensional tellurium (Te) systems to overcome these restrictions, enabled by vdWs bonds between Te atomic chains spontaneous misfit relaxation at quasi-vdWs interfaces. Wafer-scale nanomeshes composed of self-welding nanowires...
Abstract Inorganic semiconductors typically have limited p-type behavior due to the scarcity of holes and localized valence band maximum, hindering progress complementary devices circuits. In this work, we propose an inorganic blending strategy activate hole-transporting character in semiconductor compound, namely tellurium-selenium-oxygen (TeSeO). By rationally combining intrinsic semimetal, semiconductor, wide-bandgap into a single TeSeO system displays tunable bandgaps ranging from 0.7...
Abstract The visual system, one of the most crucial units human perception combines functions multi‐wavelength signal detection and data processing. Herein, large‐scale artificial synaptic device arrays based on organic molecule‐nanowire heterojunctions with tunable photoconductivity are proposed demonstrated. thin films p‐type 2,7‐dioctyl[1]benzothieno[3,2‐b][1] benzothiophene (C8‐BTBT) or n‐type phenyl‐C 61 ‐butyric acid methyl ester (PC BM) used to wrap InGaAs nanowire parallel configure...
Abstract High synthesis temperatures and specific growth substrates are typically required to obtain crystalline or oriented inorganic functional thin films, posing a significant challenge for their utilization in large-scale, low-cost (opto-)electronic applications on conventional flexible substrates. Here, we explore pulse irradiation (PIS) prepare thermoelectric metal chalcogenide (e.g., Bi 2 Se 3 , SnSe Te ) films multiple polymeric The self-propagating combustion process enables PIS...
The Von Neumann architecture has been the foundation of modern computing systems. Still, its limitations in processing large amounts data and parallel have become more apparent as requirements increase. Neuromorphic computing, inspired by human brain, emerged a promising solution for developing next-generation memory devices with unprecedented computational power significantly lower energy consumption. In particular, development optoelectronic artificial synaptic made significant progress...
Abstract 2D Ruddlesden─Popper (RP) halide perovskites are attracting increasing research interest due to their enhanced stability compared 3D perovskites. However, the quantum confinement effect of bulk organic spacers hinders separation and transport photo‐generated carriers. Here, a multiple aromatic ring spacer, 3‐benzothiophene methylammonium (BTMA), is developed for new RP perovskite. The BTMA spacer demonstrated, with significant dipole moment, can impair influence effect, presence S...
Abstract Design of efficient and robust electrocatalysts for hydrogen evolution reaction (HER) under all pH conditions has attracted significant attention. In particular, it is still a considerable challenge since the HER kinetics Pt in alkaline solutions about two to three orders magnitude lower than that acidic conditions. Herein, heterogeneous yolk–shell nanostructure with Rh nanoparticles embedded S, N co‐doped carbon nanospheres prepared by facile self‐template method reported. The...
Abstract All‐inorganic halide perovskites (AIHPs) are promising photovoltaic materials that have been extensively studied in the last decade. In addition, lead‐free AIHPs preferred because of their non‐toxic and environmentally friendly nature. However, quality fabricated by conventional solution processing methods is usually unsatisfactory, which leads to poor photoelectric performance. Herein, a facile polydimethylsiloxane‐assisted slow evaporation method can be readily used synthesize...
Converting vapor precursors to solid nanostructures via a liquid noble-metal seed is common deposition principle. However, such noble-metal-seeded process excluded from the crystalline halide perovskite synthesis, mainly hindered by growth mechanism shortness. Herein, powered spontaneous exothermic nucleation (ΔH < 0), Au-seeded CsPbI3 nanowires (NWs) realized based on vapor-liquid-solid (VLS) mode. It energetically favored that Au seeds are reacted with Pb precursor form molten Au-Pb...
Abstract Halide perovskites are potential next‐generation optoelectronic devices. However, the film quality of this charming material fabricated by conventional spin‐coating method is far from satisfactory, significantly affecting devices' performance. Here, one facile slow‐evaporating solvent (SE) demonstrated to synthesize high‐quality organic–inorganic halide perovskite films. Compared with spin coating method, films SE show much higher crystallinity, oriented lattice, smoother surface...
Abstract The surface of low‐dimensional perovskites play a crucial role in determining their intrinsic property. Understanding characteristics and the influence certain surfaces is valuable designing functional surface‐engineered structures. Meanwhile, passivation can also be applied to stabilize optimize state‐of‐the‐art perovskite‐based optoelectronics. Herein, cesium lead bromide (CsPbBr 3 ) microwire parallel arrays are designed fabricated with specific (100)‐terminated crystal planes,...
Abstract Zinc (Zn) has arisen as a significant suppressor of vacancy formation in halide perovskites, establishing its pivotal role defect engineering for these materials. Herein, the Zn‐catalyzed vapor‐liquid‐solid (VLS) route is reported to render black‐phase CsPbI 3 nanowires (NWs) operationally stable at room temperature. Based on first‐principle calculations, doped Zn 2+ can not only lead partial crystal lattice distortion but also reduce energy (absolute value) from black phase yellow...
Abstract Controllable self‐catalyzed growth of semiconductor nanowires (NWs) is great importance, particularly to avoid impurities coming from foreign catalysts deteriorate the NW properties. Although this catalyst‐free has many obvious advantages, there are very limited works focused on all‐inorganic CsPbBr 3 perovskite NWs, which one recent champion materials for electronics and optoelectronics. Here, a direct synthesis freestanding NWs via vapor–liquid–solid mechanism by chemical vapor...
Abstract Reconfigurable devices with field‐effect transistor features and neuromorphic behaviors are promising for enhancing data processing capability reducing power consumption in next‐generation semiconductor platforms. However, commonly used 2D materials reconfigurable require additional modulation terminals suffer from complex stringent operating rules to obtain specific functionalities. Here, a p‐type disordered tellurium oxide is introduced that realizes dual‐mode reconfigurability as...
Halide perovskites have attracted significant recent attention due to their remarkable photoelectric properties; however, the poor structural and moisture stability limit use for practical utilization. Interestingly, binary halides, such as BiI 3 PbI 2 , are typical constituents of halide perovskites, where they do not only similar outstanding properties but also superior stability. Herein, synthesis layered microcrystals by simple drop‐casting is investigated enhanced performance compared...
Phototransistor Devices devices based on individual single cubic phase CsPbBr3 perovskite nanowires are fabricated and thoroughly studied. The unique charge transport pathways along the axial direction hold great potential in information technology. More details can be found article number 2200727 by Johnny C. Ho co-workers.