A5078013003- ZnO doping and properties
- Advanced Photocatalysis Techniques
- Quantum Dots Synthesis And Properties
- Gas Sensing Nanomaterials and Sensors
- Chalcogenide Semiconductor Thin Films
- TiO2 Photocatalysis and Solar Cells
- Perovskite Materials and Applications
- Ga2O3 and related materials
- Iron oxide chemistry and applications
- Gold and Silver Nanoparticles Synthesis and Applications
- Copper-based nanomaterials and applications
- Nanowire Synthesis and Applications
- Advanced biosensing and bioanalysis techniques
- GaN-based semiconductor devices and materials
- Transition Metal Oxide Nanomaterials
- Analytical Chemistry and Sensors
- Metal and Thin Film Mechanics
- Nanocluster Synthesis and Applications
- Advanced Chemical Sensor Technologies
- Thin-Film Transistor Technologies
- Mine drainage and remediation techniques
- Solid-state spectroscopy and crystallography
- Advanced Sensor and Energy Harvesting Materials
- Conducting polymers and applications
- Spectroscopy Techniques in Biomedical and Chemical Research
National Taiwan University of Science and Technology
2014-2024
National Taiwan University
2011
Institute of Nuclear Energy Research
2010
Atomic Energy Council
2010
National Synchrotron Radiation Research Center
2010
National Cheng Kung University
2003-2005
What are the bottlenecks for organometal halide perovskite solar cells to achieve stability required commercialization?
Hydrogen-doped zinc oxide (ZnO:H) films were deposited by rf magnetron sputtering as transparent conductive films. The resistivity of ZnO:H film was significantly reduced the addition H2 in Ar during sputtering. electrical reached 2×10−4Ωcm. carrier concentration increased with increasing deposition. X-ray diffraction results showed that d0002 interplanar spacing concentrations. two orders magnitude substrate temperature from 150 to 250 °C Both suggested increase adding due hydrogen donor...
In this study, ZnO nanowire arrays were prepared using a hydrothermal method. During growth, polyethyleneimine (PEI) and ammonia added to adjust the structure optical properties of nanowires. Emission analysis revealed visible photoluminescence emissions from nanowires produced under various growth conditions. To correlate relationship between structural defects in nanowires, we employed X-ray absorption spectroscopy (XAS) characterize coordination number bond length On basis analytical...
Generating a sustainable energy source through photoelectrochemical (PEC) water splitting requires suitable photocatalyst. A [101]-oriented rutile TiO2 nanorod (NR) array in heterojunction with anatase on fluorine-doped tin oxide (FTO) substrate is successfully prepared using facile single-step hydrothermal process. The presence of phase over the predominant NRs' surface confirmed by transmission electron microscopy and tip-enhanced Raman spectroscopy. Solar water-splitting performances...
SrTiO3, Bi2S3, and SrTiO3/Bi2S3 heterojunction were prepared for efficient photocatalytic hydrogen production. was by different weight percentages of Bi2S3 (1, 3, 5, 7%) with SrTiO3. SrTiO3 are exhibited in cubic orthorhombic crystal structures, respectively. The morphologies have existed as nanocubic bar-like Transmission electron microscopy (TEM) X-ray photoelectron spectroscopy (XPS) results further confirmed the formation heterojunction. photoluminescence (PL) electrochemical impedance...
Visible electroluminescence from silicon nanocrystals (Si-NCs) embedded in amorphous nitride (a-SiNx) films has been observed. The Si-NC∕a-SiNx were deposited by evaporating electron gun into the inductively coupled plasma of nitrogen. density Si-NCs a-SiNx matrix was around 1012cm−2. Strong room temperature photoluminescence observed 2.8 and 3.0eV, different literature values. (EL) devices fabricated with Si-NCs∕a-SiNx film as active layer using Al or Ca∕Ag cathode indium tin oxide anode....
Abstract A method that does not employ hot‐injection techniques has been developed for the size‐tunable synthesis of high‐quality CdSe quantum dots (QDs) with zinc blende structure. In this environmentally benign synthetic route, which uses less toxic precursors, solvents, and capping ligands, QDs absorb visible light are obtained. The size as‐prepared thus their optical properties can be manipulated by changing microwave reaction conditions. were characterized XRD, TEM, UV/Vis, FTIR,...
In this study, ZnO nanoparticles (ZnO NPs) were conformally covered on the surfaces of nanowires NWs) with high diffusion coefficient (1.2 × 10−2 cm2 s−1) to make a composite photoanode. By using N719 sensitize photoanode, conversion efficiency can reach 7.14%.
A deep understanding of the relationship between surface termination organic-inorganic metal halide perovskites and their structural degradation caused by environmental stimuli is critical for increasing practicability perovskite-based photovoltaic devices. In this work, role different on CH3NH3PbI3 (MAPbI3) perovskite upon simultaneous exposure to water oxygen in presence light systematically investigated using density functional theory (DFT) ab initio molecular dynamics (AIMD) simulations...
The charge transfer between N3 dyes and TiO2 electrodes has been investigated by Raman spectroscopy. nanoparticles are synthesized at different temperatures to form the compact layer in photoelectrode. red shift of Eg(3) mode electrode increases with an increase synthesis temperature nanoparticles, which is also associated its vibration conversion efficiency. This indicates that reaches optimal when 190 °C. In electrochemical impedance spectroscopy measurements dye-sensitized solar cells...
In general, organic capping molecules are applied to passivate the surface of semiconductor nanomaterials modulate optical properties these nanostructures. this work, two alkylamines (n-butylamine (n-BA) and n-hexylamine (n-HA)) oleic acid (OA) were used modify moderately high luminescent CdS quantum dots (QDs). From photoluminescence (PL) spectra yield (QY) analyses, we observed that PL QY QDs decreased after introduction alkylamine molecules. The decay kinetics for CdS-capping molecule...
This paper reports a facile continuous flow injection (CFI) process to synthesize high-quality long zinc oxide nanowire arrays (ZnO-NAs) using hydrothermal method. In previous related studies, the photoluminescence (PL) spectra of ZnO-NAs synthesized batch exhibit highly visible emission caused by defect structures. contrast process, grown CFI can reduce in PL effectively, demonstrating qualities as superior those process. To understand difference between processes and inductively coupled...
Zinc oxide nanograss (ZnONG) decorated with gold (Au) nanospeckles is demonstrated as a sensing platform for bacterial DNA hybridization in this study. Thermal evaporation of 5 nm Au on hydrothermally synthesized ZnONG generates highly dense speckles, which contributes to an approximately two-fold enhancement the effective surface area and diffusion coefficient cyclic voltammetry (CV) measurement compared non-speckled nanograss. Selective capture molecular probes from our predesigned...
The growth of uniform gallium nitride (GaN) thin films was reported on (100) Si substrate by remote plasma atomic layer deposition (RP-ALD) using triethylgallium (TEG) and NH3 as the precursors. self-limiting GaN manifested saturation rate with doses TEG NH3. increase in temperature leads to rise nitrogen content improved crystallinity films, from amorphous at a low 200 °C polycrystalline hexagonal structures high 500 °C. No melting-back etching observed GaN/Si interface. excellent...
Cascade CdS/CdSe/ZnS quantum dots sensitized titanium dioxide nanorod arrays (TiO2–NRAs) solar cells exhibiting a high efficiency of around 3.06% have been obtained. Under AM 1.5, 100 mW cm−2 illumination, short-circuit current density 13.83 mA and an open-circuit voltage 0.45 V are This is relatively higher than other QDs-sensitized TiO2 NRAs previously reported in the literature.
Porous tungsten oxide films of nanocrystalline embedded in an amorphous matrix have been synthesized via poly(ethylene glycol) (PEG)-template sol-gel technique with peroxopolytungstic acid precursor. The effects PEG addition on the microstructure and electrochromic performance are investigated. Charge transfer/transport properties studied by electrochemical impedance spectroscopy (EIS) as well. Triclinic film is formed absence PEG. PEG-template demonstrates superior to that crystalline film,...
We successfully synthesized well aligned ZnO nanowire (ZnO NW) arrays on Si (100) and indium tin oxide (ITO) glass substrates at the low temperature of 500 °C by a two-stage growth process without metal catalyst. The NWs had diameters in range 50−100 nm lengths 5−8 μm. X-ray diffraction showed that NW single-crystal wurtzite structures grew along c-axis. Photoluminescence spectra revealed strong UV band 3.2 eV broad green 2.3 room temperature. also observed alignment situation emission was...
In this study, a long ZnO nanowire (NW) array was synthesized using continuous flow injection (CFI) process to replace the conventional multi-batch process. According electrochemical impedance spectroscopy (EIS) measurements, diffusion coefficient of NW by CFI is higher than that NWs addition, electron transit time found depend on thickness array. To effectively improve conversion efficiency dye-sensitized solar cells (DSSCs), high with 1.2 × 10−2 cm2 s−1 an ammonia-assisted NPs were covered...
Organolead halide perovskites are interesting light-absorbing materials for solar cells and light-emitting devices.
Confeito-like gold nanoparticles adsorbed on the self-assembled monolayer hierarchy of dendrimer/polystyrene spheres can strongly enhance Raman scattering, being superior to those 3-aminopropyltriethoxysilane.