Ming-Chung Wu

• Ph. D.
• Professor (Associate) at Chang Gung University

Structural engineering has proven effective in tailoring the photocatalytic properties of semiconductor nanostructures. In this work, a sophisticated double‐hollow yolk@shell nanostructure composed of a plasmonic, mobile, hollow Au nanosphere (HGN) yolk and a permeable, hollow CdS shell is proposed to achieve remarkable solar hydrogen production. T...

Nociceptive pain perception is a remarkable capability of organisms to be aware of environmental changes and avoid injury, which can be accomplished by specialized pain receptors known as nociceptors with 4 vital properties including threshold, no adaptation, relaxation, and sensitization. Bioinspired systems designed using artificial devices are i...

Perovskite solar cells (PSCs) have attracted considerable interest owing to their low processing costs and high efficiency. A crucial component of these devices is the electron transport layer (ETL), which plays a key role in extracting and transmitting light-induced electrons, modifying interfaces, and adjusting surface energy levels. This minimiz...

Photocatalytic reduction of CO2 is a promising strategy to mitigate the effects of global warming by converting CO2 into valuable energy‐dense products. Silver bismuth iodide (SBI) is an attractive material owing to its tunable bandgap and favorable band‐edge positions for efficient CO2 photoreduction. In this study, SBI materials, including AgBi2I...

Significant advancements have been made in the development of perovskite solar cells (PSCs) in recent years, resulting in increased efficiency rates. Nonetheless, the presence of lead within these cells has become a pressing concern. Our study investigates the correlation between tolerance of barium substitution and A-site cation composition throug...

Volatile organic compounds (VOCs), often invisible but potentially harmful, are prevalent in industrial and laboratory settings, posing health risks. Detecting VOCs in real-time with high sensitivity and low detection limits is crucial for human health and safety. The optical sensor, utilizing the gasochromic properties of sensing materials, offers...

Photon-induced deactivation of traps in MAPbI 3 can strongly affect charge relaxation behavior. Charge relaxation associated with photo-induced deactivation of various traps in MAPbI 3 films was investigated through steady-state and time-resolved photoluminescence spectroscopy under laser excitation at 635 and 430 nm to investigate the properties o...

Visual disabilities affect more than 250 million people, with 43 million suffering from irreversible blindness. The eyes are an extension of the central nervous system which cannot regenerate. Neural tissue engineering is a potential method to cure the disease. Injectability is a desirable property for tissue engineering scaffolds which can elimina...

Human−exhaled breath mainly contains water, oxygen, carbon dioxide, and endogenous gases closely related to human metabolism. The linear relationship between breath acetone and blood glucose concentration has been revealed when monitoring diabetes patients. Considerable attention has been directed toward developing a highly sensitive volatile organ...

Photocatalytic H2 Evolution In article number 2200172, Kijung Yong and co‐workers present a Pt/g‐C3N4/TiO2/IrOx hollow sphere for photocatalytic water splitting. The two cocatalysts, Pt and IrOx, are spatially separated along the Z‐scheme charge‐transfer pathway within the g‐C3N4/TiO2 heterojunction. The synergistic effect of the spatial separation...

High absorption ability and direct bandgap makes lead-based perovskite to acquire high photovoltaic performance. However, lead content in perovskite becomes a double-blade for counterbalancing photovoltaic performance and sustainability. Herein, we develop a methylammonium bismuth iodide (MBI), a perovskite-derivative, to serve as a lead-free light...

In recent years, additive engineering has received considerable attention for the fabrication of high-performance perovskite solar cells (PSCs). In this study, a non-ionic surfactant, polyoxyethylene (20) sorbitan monolaurate (Tween 20), was added as an additive into the MAPbI3 perovskite layer, and the thermal-assisted blade-coating method was use...

Nowadays, high-efficiency perovskite solar cells mainly comprise a lead-based light-absorber layer. Without a doubt, the unprecedented power conversion efficiency (PCE) of perovskite solar cells makes them an optimistic solution for sustainable or renewable energy sources. However, the toxic composition of lead, a notorious element for organisms, i...

Organic-inorganic halide perovskite solar cells (PSCs) have recently become a promising and potentially commercially-ready photovoltaic device. However, the hysteresis effect is one of the most significant problems hindering this progress. The main reasons can be attributed to the lower electron mobility of TiO2, causing the imbalance of electron a...

A variety of cellulose-based polymer composite materials has been developed and show different impacts on the morphologies and properties of composites. Herein, we report the morphologies and properties of composites by blending polyurethane (PU) with either ethyl cellulose (EC) or cellulose nanofiber (CNF) through either drop-casting or electrospi...

Herein, a Z‐scheme heterojunction with spatially separated cocatalysts is proposed for overcoming fundamental issues in photocatalytic water splitting, such as inefficient light absorption, charge recombination, and sluggish reaction kinetics. For efficient light absorption and interfacial charge separation, Z‐scheme organic/inorganic heterojunctio...

Lead, a toxic element in organometal halide perovskite solar cells, has caught lots of attention and has raised public concerns after such perovskite solar cells made rapid progress in their photovoltaic performance. Herein, a series of lead-free light absorber layers with a rudorffite structure were examined in this study. The obscure role of A-si...

The existence of toxicity Pb in perovskite solar cells may hinder the pace of commercialization. Based on our previous work, Ba2+ is most suitable for partially replacing Pb2+ among alkaline‐earth metal cations. However, high substitution ratio may lead to poor film coverage. Defects in perovskite layer as recombination centers and trap sites would...

The structural characterization of wet‐gel‐state hydrogel at multi‐length scales ranging from nanometer to micrometer is very challenging and rarely reported. Herein, tunable high‐strength nanocomposite hydrogels based on cellulose nanofibers with various cross linkers are synthesized and characterized. Synchrotron tomography and small‐angle X‐ray...

According to the Colour Blind Awareness organization's report, color vision deficiency, including color blindness and partial tritanopia, affects ≈300 million people worldwide. However, those affected can only improve their color vision deficiency by color light training and stimulation therapies or through contact lenses to correct vision with lim...

Objectives Toxic lead and poor stability are the main obstacles of perovskite solar cells. Lead-free silver bismuth iodide (SBI) was first attempted as solar cells photovoltaic materials in 2016. However, the short-circuit current of the SBI rudorffite materials is commonly below 10 mA/cm2, limiting the overall photovoltaic performance. Here, we pr...

Cellulose exhibits outstanding chemical stability, nontoxicity, and renewable ability and is regarded as a candidate for next‐generation sustainable materials. After the nanofibrillation of cellulose, cellulose nanofiber (CNF) exhibits unique optical properties, good mechanical strength, and a high aspect ratio. It is suitable to be a matrix for th...

In this study, the effects of n-butylamine-modified graphite nanoflakes (BMGNFs) on the crystalline phase transition, ferroelectric behaviors, and piezoelectric energy harvesting properties of poly(vinylidenefluoride-co-trifluoroethylene) (P(VDF-TrFE)) copolymers are investigated. To confirm the blending of BMGNFs in P(VDF-TrFE), X-ray spectroscopy...

Nowadays, a dye-sensitized solar cell (DSSC) attracts attention to its development widely due to its several advantages, such as simple processes, low costs, and flexibility. In this work, we demonstrate the difference in device structures between small size and large size cells (5 cm × 5 cm, 10 cm × 10 cm and 10 cm × 15 cm). The design of the phot...

Perovskite Solar Cells In article number 2100257, Ming-Chung Wu, Kun-Mu Lee, and co-workers demonstrate an approach where two-dimensional g-C3N4 is applied as a template for controlling the nucleation of the perovskite active layer. Adding the urea-polymerized g-C3N4 into the perovskite active layer allows for a uniform surface morphology and a red...

Background Poly(3,4-ethylenedioxythiophene):poly-(styrenesulfonate) (PEDOT:PSS) is a promising conductive polymer for the flexible piezoresistive pressure sensor. However, intrinsic hydrophilicity is detrimental to its structural stability under moisture. The present study aims to enhance piezoresistive pressure sensors' stability to achieve the hi...

This study improved quality of CH3NH3PbI3 (MAPbI3) perovskite films by delaying thermal annealing in the spin coating process and introducing KI and I2 to prepare MAPbI3 films that were low in defects for high-efficiency perovskite solar cells. The influences of delayed thermal annealing time after coating the MAPbI3 perovskite layer on the crystal...

Organic-inorganic hybrid perovskite solar cell (PSC) demonstrates outstanding photovoltaic characteristics. However, the instability under high temperature and high relative humidity remains an obstacle that needs to be overcome. Besides, the rapid growth of perovskite crystal causes many defect formation in the perovskite active layer, leading to...

Photon-induced trap deactivation is commonly observed in organometal halide perovskites. Trap deactivation is characterized by an obvious photoluminescence (PL) enhancement. In this work, the properties of traps in CH3NH3PbI3 perovskite films were studied based on the PL enhancement excited by lasers of different wavelengths (633 nm and 405 nm). Tw...

Photothermal therapy is considered to be a promising approach for minimally invasive tumor treatment. Before the clinical trial, the photo-induced heat production efficiency in tumor tissue needs improvement. Herein, we demonstrated a one-pot hydrothermal synthesis followed by calcination to prepare the Ag NPs-precipitated TiO2 photocatalysts. With...

Photocatalysis has been regarded as a promising process for pollution removal and green energy. TiO2 nanofibers synthesized by the hydrothermal method presents high crystalline and performs excellently due to the efficient charge transport. For practical use, we designed an autoclave with a 1,000 cm³ of Teflon-liner inside and stainless steel outsi...

In recent years, organometal halide perovskite solar cells (PSCs) have been developed rapidly. To promote commercialization, certain critical issues have to be resolved, for instance, the lack of stability while exposing to moisture, heat, and light. One of the solutions to improve stability is the lower dimension perovskite structure. The high sta...

Solar-to-fuel conversion is an innovative concept for green energy, attracting many researchers to explore them. Solar-driven photocatalysts have become an essential solution to provide valuable chemicals like hydrogen, hydrocarbon, and ammonia. For sustainable stability under solar irradiation, titanium dioxide is regarded as an acceptable candida...

A carrier transport layer and its interfacial effects on an organometal halide perovskite light harvesting layer play an influential factor in either photovoltaic performance or long-term stability of a perovskite solar cell (OHPSC). Although the understandings of the carrier transport layers and interfacial effects on regular structured OHPSCs hav...

The rapid development of machine learning has proven its potential in material science. To acquire an accurate and promising result, the choice of descriptor plays an essential role in dictating the model performance. In this work, we introduce a set of novel descriptors, Element Code, which is generated from pseudopotential. Using a variational au...

In article number 2000860 by Jer‐Chyi Wang and co‐workers, a cheap and mass‐productive compacted self‐assembly graphene with H2 plasma surface modification is used as the bottom electrode of GdxOy memristors to emulate the robust synapses in nervous systems and provide an opportunity for applications in future neuromorphic computing systems.

Perovskite solar cells (PSCs) have become one of the most promising renewable energy converting devices. However, in order to reach a sufficiently high power conversion efficiency (PCE), the PSCs typically require a high‐temperature sintering process to prepare mesostructured TiO2 as an efficient electron transport layer (ETL), which prohibits the...

Perovskite Solar Cells In article number 2000197, Wei‐Fang Su and co‐workers incorporate a cation of acetamidinium (Aa⁺) into conventional perovskite layer (MAPbI3). The Aa⁺ cation effectively hinders the ion migration and enhances the long‐term stability of perovskite solar cells. The champion device achieves 20.68% efficiency. More than 80% of in...

The rise of artificial intelligence and Internet of Things has led to an increase in the demand for a large amount of data computing in recent years. To fulfill the requirements of neuromorphic engineering, a promising system composed of artificial neurons and synapses has to be developed. Here, a cheap and mass‐productive compacted self‐assembly (...

Perovskite solar cells (PSCs) have earned considerable attention and are candidates against the inevitable energy crisis. Even though various successful PSCs have emerged, increasing the PCE by reinforcing charge collection is still a critical issue. The manipulation of carriers between the perovskite active layer and the electron extraction layer...

Layer-dependent solvent vapor annealing (LDSVA) treatment using dimethylformamide (DMF) vapor on specific layers of stacked poly(vinylidenefluoride-co-trifluoroethylene) (P(VDF-TrFE)) copolymers by metal-ferroelectric-metal (MFM) capacitors and nanogenerators was investigated in this study. Prior to the fabrication of the devices, X-ray diffraction...

Perovskite Solar Cells In article number 2000093, Ming‐Chung Wu, Kun‐Mu Lee, and co‐workers use polyethylene glycol (PEG) as an additive for the perovskite active layer in lead‐reduced perovskite solar cells. The PEG can effectively control the surface morphology of the perovskite film and improve the charge carrier transport. For 10% lead‐reduced...

Ion migration in organometal halide perovskite solar cell (OHPSC) and crystal structure evolution of organometal halide perovskites (OHPVSK) in air are considered as one of the critical factors for unstable performance and of the urgent issues for the reliability of OHPSCs. Herein, a novel cation of acetamidinium (Aa⁺) with higher boiling point and...

Volatile organic compounds (VOCs) are potentially dangerous to the environment and human health. The developed sensing template in this study was prepared by a one-step process on a glass substrate using the electrospinning technique. The sensing material made of the uniaxial aligned CdSe-CdS/Ag/PMMA composite scaffold consists of CdSe-CdS core-she...

Perovskite solar cells (PSCs) have earned widespread attention owing to its fast-growing power conversion efficiency (PCE). However, there are some challenges for this type of solar cells. The toxicity issue, current density-voltage (J-V) hysteresis, and uncertain stability hinder commercialization. In this study, we developed the PSCs with MA0.4FA...

The organic‐inorganic halide perovskite solar cells (PSCs) have been rapidly developed in just a few years due to its high power conversion efficiency. However, it still faces some critical issues, one of which is the presence of toxic lead (Pb²⁺). Recent researches have found that barium (Ba²⁺) can partially replace the Pb²⁺ in perovskite structur...

Detection of volatile organic compounds (VOCs) is one of the essential concerns for human health protection and environmental monitoring. In this study, the blending fibers using a donor-acceptor copolymer were fabricated by electrospinning technique and subsequent UV/ozone treatment. The donor-acceptor polymers were polyaniline, P3TI, and poly(met...

CF4 plasma treatment on n⁺-Si wafers as bottom electrodes (BEs) of poly(vinylidene fluoride-co-trifluoroethylene) (P(VDF-TrFE)) metal-ferroelectric-metal (MFM) capacitors has been investigated in this study. Prior to the fabrication of MFM capacitors, comprehensive material analyses are administered to identify the incorporation of fluorine atoms i...

This study demonstrates the effect of electron collection and transportation for TiO2 electron transport layer (ETL) of the mesoscopic perovskite solar cells (PSCs). The influence of compact TiO2 layer (c-TiO2) with various spray cycles, the particle size effect of mesoporous TiO2 (meso-TiO2) film and post-treatment of TiO2 electrode for perovskite...

Piezoresistive pressure sensors have garnered significant attention because of their wide applications in automobiles, intelligent buildings, and biomedicine. For in-vivo testing, the size of pressure sensors is a vital factor to monitor the pressure of specific portions of a human body. Therefore, the primary focus of this study is to miniaturize...

Volatile organic compounds (VOCs) are organic chemicals having a high vapor pressure at room temperature. Chronic exposure to VOC vapor can be potentially dangerous to human health. In this study, we build a high-performance freestanding aligned Ag/CdSe-CdS/poly(methyl methacrylate) (PMMA) texture to detect VOC vapors. The insight of this new VOC s...

Anionic and cationic defects are considered as one of the crucial factors that affect carrier transport property and degradation of perovskite photovoltaic materials. Herein, we demonstrate a simple passivation of hot casted perovskite film in air by a dipolar ion: 2-thiophene ethyl ammonium chloride (TEACl), showing enhanced power conversion effic...

Organic-inorganic perovskite solar cells (PSCs) is considered one of the most promising energy harvesting technologies due to its high power conversion efficiency (PCE). The T. Miyasaka group first reported the methylammonium lead halide (CH3NH3PbX3) as a light absorber of dye-sensitized solar cells with a PCE of 3.8% in 2009. Over the past decade,...

In this study, the fibers consisted of poly(methyl methacrylate) (PMMA) and polyaniline (PANI) were fabricated by electrospinning method to detect relative humidity (RH). Moreover, various concentrations of PANI/PMMA were prepared and modified by UV/ozone treatment to increase the sensitivity of relative humidity. The characteristics of the PANI/PM...

Various metal-doped TiO 2 nanofibers were prepared by hydrothermal synthesis followed by the thermal treatment in air. An array of metal dopants including Ag, Au, Co, Cr, Cu, Fe, Ni, Pd, Pt, Y, and Zn, were respectively doped into TiO 2 NFs to acquire the visible-light photocatalytic activity. Considering the photodegradation results under visible-...

Heavy metal pollution of wastewater with coexisting organic contaminants has become a serious threat to human survival and development. In particular, hexavalent chromium, which is released into industrial wastewater, is both toxic and carcinogenic. TiO2 photocatalysts have attracted much attention due to their potential photodegradation and photor...

A series of metal decorated hydrogenated TiO2 nanofibers (metal-H:TiO2 NFs) are synthesized successfully in this study. It is synthesized by the hydrothermal approach and combined with wet impregnation method in thermal hydrogen reduction. Nine types of metal nanoparticles, Ag, Co, Cr, Cu, Fe, Ni, Pd, Pt and Y, were used to decorate on the surface...

Organic-inorganic hybrid perovskite solar cells (PSCs), a superstar of photovoltaic devices, have attracted people's attention owing to their adjustable energy band gap value, extremely high absorption coefficient, long charge carrier diffusion length, and dramatically high power conversion efficiency. In recent years, researchers have tried hard t...

The perovskite solar cells (PSCs), bearing the advantages including low cost of materials and solution process, high power conversion efficiency, has drawn intensive attention. The alkaline earth metal can replace the toxic lead in the perovskite-structured absorber (PSA) due to the approximate ionic radius. Some of these metals can fit octahedral...

Lead halide perovskite-structured solar cells (PSCs) have drawn great attention due to its rapid improvement in photoelectric conversion efficiency in recent years. In this study, we have enhanced photovoltaic performance by using various mesoscopic zinc-doped TiO2 (meso-Zn:TiO2) as the electron extraction layer. The Zn:TiO2 nanoparticles (Zn:TiO2...

The dual layer fluorine‐doped tin oxide (FTO) films fabricated by a sequential spray pyrolysis for the high‐efficiency perovskite solar cells (PSCs) is prepared. The H‐FTO/L‐FTO dual layer film consists of a H‐FTO layer prepared at high deposition temperature (~ 450 oC) and a L‐FTO layer, fabricated at low deposition temperature (~ 150 oC), which i...

In this study, we demonstrated a simple method of fabricating a high-performance surface-enhanced Raman scattering (SERS) substrate. Monodispersive SiO2 colloidal spheres were self-assembled on a silicon wafer, and then a silver layer was coated on it to obtain a Ag/SiO2 SERS substrate. The Ag/SiO2 SERS substrates were used to detect three kinds of...

In this study, we developed a novel sensing material fabricated using a poly(3-hexylthiophene) (P3HT)/poly(methyl methacrylate) (PMMA) blend fiber on a glass substrate. The sensing materials can easily be used for sensing toluene vapor detected from extinction spectral changes. The extinction spectra variation is noted from the absorption of volati...

Solution-processed zinc oxide (ZnO)-based planar heterojunction perovskite photovoltaic device is reported in this study. The photovoltaic device benefits from the ZnO film as a high-conductivity and high-transparent electron transport layer. The optimal electron transport layer thickness and post-baking temperature for ZnO are systematically studi...

Series of transition metal-doped TiO2 (metal/TiO2) is prepared by combining the hydrothermal synthesis and air-thermal treatment without any reduction process. The selected transition metal precursors, including Ag, Au, Co, Cr, Cu, Fe, Ni, Pd, Pt, Y, and Zn, were individually doped into TiO2 nanofibers to evaluate the photocatalytic degradation act...

Hybrid lead halide perovskite structured materials have created enormous expectations for low-cost and high-performance optoelectronic devices. The light-harvesting active layer of perovskite solar cell consists of hybrid organic-inorganic lead halide-based material. In this study, we successfully fabricated the perovskite photovoltaics with partia...

Anti-solvents play a critical role on the preparation of perovskite active layers for photovoltaic applications. This work explores the treatment of various anti-solvents for adjusting the crystallinity and morphology of perovskite active layer. It is found that the anti-solvent with a low dielectric constant and dipole moment is the most suitable...

Perovskite solar cell is a novel photovoltaic technology with the superior progress in efficiency and the simple solution processes. Develop lead-free or lead-reduced perovskite materials is a significant concern for high-performance perovskite solar cell. Among the alkaline earth metals, the Sr²⁺ and Ba²⁺ are suitable for Pb²⁺ replacement in perov...

The organic-inorganic lead halide perovskite solar cell is considered as one of the most promising technology for future photovoltaics because it shows high power conversion efficiency (PCE) and can be fabricated through a simple solution process. Non-toxic alkaline earth metal cations are suitable candidates to replace toxic lead in perovskite bec...

Volatile organic compounds (VOCs) sensors are the imperative technology of modern life for environmental monitoring to detect any harmful elements and to prevent lethal exposure. The sensing material is a fibrous film consisting of poly(3-hexylthiophene)(P3HT)/poly(methyl methacrylate)(PMMA) blend, and it is fabricated on a glass substrate. The P3H...

In order to develop high-performance photocatalysts that are easy to produce even in industrial quantities, we developed a facile method of preparing niobium-doped titanium dioxide (Nb:TiO2) by hydrothermal synthesis and followed by thermal annealing treatment. Niobium-ion doping has been considered as an effective way to improve Nb:TiO2 performanc...

Hydrogenated titanium dioxide has attracted intensive research interests in pollutant removal applications due to its high photocatalytic activity. Herein, we demonstrate hydrogenated TiO2 nanofibers (H:TiO2 NFs) with a core-shell structure prepared by the hydrothermal synthesis and subsequent heat treatment in hydrogen flow. H:TiO2 NFs has excelle...

Doping metal-ion into TiO2 materials is an effective method for enhancing the performance of dye-sensitized solar cells (DSSCs). In order to develop materials that are easy to produce even in industrial quantities, we established a facile method by hydrothermal synthesis and subsequent heat treatment to prepare bismuth doped titanium dioxide nanofi...

Indium gallium zinc oxide (InGaZnO4, IGZO) has attracted explosive growth in investigations over the last decades as an important material in the thin-film transistor. In this study, the various nitrate precursors, including indium nitrate, gallium nitrate, and zinc nitrate, were prepared from the various metals dissolved in nitric acid. Then, we u...

Titanium dioxide (TiO2) based material is probably the most promising environmentally friendly photocatalyst, with low cost, high photocatalytic activity, and excellent photostability as demonstrated in photocatalytic hydrogen generation and in abatement of organic pollutant. In this study, sodium hydrogen titanate nanofibers were prepared by alkal...

Many organic/inorganic nanocomposites have been fabricated into fibrous materials using electrospinning techniques, because electrospinning processes have many attractive advantages and the ability to produce relatively large-scale continuous films. In this study, the polyvinyl alcohol (PVA)/silk/titanium dioxide (TiO2) nanocomposite self-cleaning...

We present here a novel method for producing highly visible-light absorbing black TiO2 nanocrystals by combining sol-gel synthesis and subsequent heat treatment in low partial pressure H2. The synthesized black TiO2 nanocrystals with trivalent titanium, oxygen vacancies and structural defects show a significantly lowered optical bandgap in referenc...

The present work demonstrates a biomimetic electrospun scaffold based on polyurethane (PU) and ethyl cellulose (EC), featuring uniform fibrous nanostructures and three dimensional porous networks. The analytical relation between processing conditions and fibrous nanostructures is established which guides the rational processing with tunable fiber d...

Doping bismuth ions into photocatalytic materials is one of the most effective methods for preparing highly visible-light-active photocatalysts. In order to develop high-performance photocatalytic materials that are easy to produce, even in industrial quantities, we developed a facile method to prepare bismuth-doped titanium dioxide (Bi-doped TiO2)...

Conjugated polymers are promising materials for oxygen sensing owing to their specific interaction with oxygen molecules and also advantages of low cost, easy processing and room temperature operation. The present work for the first time demonstrates an oxygen sensing material of poly(3-hexylethiophene) (P3HT)-TiO2 nanorod hybrid thin film which re...