Session Index

Embedding single and double indium nanoparticles (In-NPs) sheets within a 52-nm
thick TiO2 anti-reflective layer, the conversion efficiency of InGaP/GaAs/Ge triple-junction
solar cells (3J-SCs) is significantly enhanced due to plasmonic effects. The distance between
In-NPs sheet and 3J-SC effecting on the conversion efficiency was also investigated.
Therefore, the cell with double In-NPs sheets, which with the distance of 10 nm and 42 nm
away from the surface of 3J-SC, obtained the lowest reflectance and highest EQE, as well as
resulting in a remarkable 33.22% increasing in conversion efficiency, due to the combination
of near-field and far-field plasmonic effects.

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Two-dimensional (2D) perovskites have been regarded as potential active materials for optoelectronic devices. Perovskite flakes at nanoscales in thickness have shown distinct optoelectronic properties, such as higher fraction of radiative recombination, in comparison to their bulk counterparts. However, nanoflakes of 2D perovskites are seldom demonstrated and investigated. In this research, we successfully fabricate PEA2PbI4 (2D) Ruddlesden-Popper (RP) perovskite nanoflakes of 11 nm by using a facile three-step method, and their optoelectronic and field-effect characteristics are studied.

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Advanced green energy technologies have attracted wide attention due to gas and oil depletion. It is vital to generate green hydrogen at large scales and convert it to electricity using a fuel cell. The electrocatalytic activities in hydrogen and oxygen evolution reactions using nanoscale Pt/C and IrO2 electrodes prepared by the spin-coating method improve the overall water splitting performance compared to the commercial electrode materials.

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We have investigated how to utilize laser-fired contact (LFC) to eliminate the need for the high-temperature screen printing process currently employed for metallization of the passivated emitter and rear cell (PERC), which is the mainstream solar cell technology. Additionally, a comparison will be made between using graphene oxide (GO) and aluminum oxide (Al2O3) as rear passivation layers for PERC.

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Energy is a serious global issue in today's world, and the world is trying to find ways to improve energy efficiency. Hydrogen can be considered one of the most efficient renewable energy sources. In this investigation, by using NiS as the oxygen evolution reaction catalyst and doping Mo ions in the Bi2S3/ZnO photoanode and modifying the composition of the electrolyte, the efficiency of photoelectrochemical hydrogen production was improved. In addition, this new photoanode can achieve low onset potential and high photocurrent, thereby comprehensively improving hydrogen generation efficiency and reducing energy waste.

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In this study, we deposited SnO as a channel layer by two different sputtering methods and optimized the SnO film by adjusting different post deposition annealing temperatures. With RF sputtering annealing at 250℃ SnO TFT exhibited p-type electrical characteristics of high mobility of 0.58 cm2/V∙s and on off current ratio (ION/IOFF) of 2.89×102 . To sum up, SnO TFT is very promising for applying to flat panel display technology.

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This study used gold-coated aluminum foil as a substrate for surface-enhanced Raman scattering (SERS) to study the Raman spectra of an environmentally friendly explosive compound, Dinitrobenzofuroxan (DNBF), at concentrations ranging from 10-4 M to 10-8 M. Results showed no significant peaks in the Raman spectra at 10-7 M concentration, suggesting noticeable enhancement effects of the substrate on DNBF only up to 10-6 M.
Furthermore, SEM, XRD, and XPS were employed to confirm substrate composition and morphology, aiding data analysis.



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By implementing Intense Xenon Treatment for the optimization of the Electron Transport Layer (ETL), remarkable advancements were made in enhancing performance, leading to an exceptional power conversion efficiency (PCE) of 13.12% in organic solar cells (OSCs).

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CuO thin films for photoelectrochemical water splitting are fabricated using the sol-gel spin coating method. The thickness of CuO thin films is precisely controlled by depositing different layers. Thickness-dependent optical properties are investigated to optimize the photoconversion efficiencies of photoelectrochemical water splitting using CuO thin films.

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Different Si thin films were deposited through different deposition processes. The
study aimed to explore the effects of experimental parameters and the etching depth of the target
material on the characteristics of film thickness distribution, to understand the optical properties
of the silicon thin films.

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Direct-current magnetron sputtering and plasma-assisted reactive magnetron sputtering under low temperatures have deposited ITO thin films. ITO thin films' better electrical and optical properties were investigated under different growth conditions. In this study, A comparison with ITO films by both technology under low temperatures was analyzed by UV-VIS-NIR spectrometer, four-point probe, hall effect measurement, and X-ray diffractometer.

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We present a novel laser coloring approach for stainless steel (SUS304) by employing non-overlapping subpixels within a single pixel to achieve color mixing. In contrast to previous methods that relied on adjusting laser parameters to produce color variations, our method enables the generation of intermediate colors between selected hues. The results demonstrate a two-color gradient transition in the color bar, offering a new artistic choice for laser coloring.

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This study aims to understand the electronic properties of the NiCrFeVCuTi high-entropy materials and demonstrate its correlations between semiconductor properties in corrosive environment. The surface chemistry was examined via X-ray photoelectron spectroscopy (XPS) and hard X-ray photoelectron spectroscopy (HAXPES). The XPS system equipped with Ultraviolet photoemission spectroscopy (UPS) and Low-energy inverse photoelectron spectroscopy (LEIPS) was used to investigate the electronic structure of the materials along with different corrosion durations. The results provide insights to monitor the chemical and electronic properties of high entropy oxide thin films, which provides a pathway for investigating materials property of semiconductor electronics in the future.

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We numerically investigate the optical gain spectrum of the bulk and tri-layer of molybdenum disulfide functioned as an optical amplifier. In room temperature, the bulk has a minimum interaction photon energy at the band gap (1.23 eV) with a threshold injected current density ~3 kA/cm2. For the 2D tri-layer film, the minimum interaction photon energy is lifted to 2.09 eV due to the quantum-well structure, and the threshold injected current density is ~1.9 kA/cm2 which is significantly lower than that in bulk. The dependence of the optical gain profiles on the temperature and injected current density are also investigated.

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The Polymer dispersed liquid crystals (PDLC), in which liquid crystal droplets are
dispersed in a polymer matrix, have opaque state or transparent state. Without external electric
field, the refractive index of liquid crystal droplets do not match that of the polymer matrix, so
that so that the light is strongly scattered when it passes through the PDLC film. By tuning the
liquid crystal properties, we have made a film that reflects Infrared and transmits visible light.

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In this study, the spin-coating method has been used to prepare TiO2 compact layer with different thicknesses. Afterward, different weight percentages of silver nanoparticle solution were added to TiO2 doctor blade colloid. Ag-TiO2 films were prepared by using doctor blade method for Dye-sensitized solar cells (DSSCs). With the reduced electron recombination at the interface between electrolyte and FTO, and with the enhancement of localized surface plasmon resonance (LSPR) effect, the photovoltaic properties is improved, where an optimal photoelectric conversion efficiency (PCE) of 5.96 % is achieved.

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In this study, the deformation titanium dioxide aggregated scattering layer (DTA) is first prepared using a blade-coating method to enhance the light utilization and dye adsorption capabilities of the photoanode. The silver nanoparticles are added into the absorbing layer, and then are prepared using spray coating method. Due to the localized surface plasmon resonance (LSPR) effect caused by the Ag-TiO2 photoanode this has led to an increase in the photovoltaic conversion efficiency (PCE) from 3.91% to 4.5%. It should be noted that the incorporation of a bilayer structure with a scattering layer has further improved the PCE to 5.1%.

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Nickel Cobalt Sulfide ternary compound (NiCo2S4) compound is a versatile semiconductor with strong electrochemical abilities in applications like dye-sensitized solar cells (DSSCs) and supercapacitors (SCs). Our study employs NiCo2S4 as a DSSCs cathode and SCs anode, creating photorechargeable supercapacitors (PS). Two DSSCs in series achieve high charge potential, using platinum and NiCo2S4 counter electrodes. For the SCs, NiCo2S4 acts as the positive electrode alongside bismuth's negative electrode, forming an asymmetric supercapacitor (ASCs). Successfully combining DSSCs and ASCs demonstrates a high-performance PS device.

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In photoelectrochemical reactions, the performance of n-GaN nanopillar photoelectrodes declines due to photocorrosion. This study explores enhancing stability during PEC reactions. Photoelectrodes of n-GaN with a Ni(OH)2 capping layer showed more durability than Ni(OH)2-free ones. In particular, the effect of a NiO seed layer on Ni(OH)2 nanosheet coverage on n-GaN was evaluated. Enhanced stability is mainly attributed to the Ni(OH)2 coating, passivating defects in n-GaN and facilitating carrier transport to the electrolyte, suppressing photocorrosions.

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This study presents a hybrid non-enzymatic glucose sensor based on localized surface plasmon resonance (LSPR) of gold nanoparticles (Au NPs) modified copper oxide/zinc oxide nanorod array (Cu2O/ZnO NRA). An aluminum film was first grown into an array of pores through an anodization process, and it was followed by electrodeposition of ZnO nanorods within the arrayed pores. Subsequently, Cu2O was electrochemically deposited on the ZnO NRA. Au NPs were chemically synthesized and dispersed on the Cu2O/ZnO NRA surface using Nafion as an ion exchange resin. The sensor exhibited a linear range of 7.41-11.111 mM and a sensitivity of 315.67 μAmM-1cm-2.

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In this work, tungsten-doped vanadium oxide (VO2) films were deposited by electron beam evaporation associated with ion beam-assisted deposition.The optical and mechanical properties of these VO2 films at different tungsten doping concentrations were investigated. The results show that the visible light transmittance and residual stress of vanadium oxide films decrease with the increase of doping tungsten concentration. When the VO2 sample with a doping concentration of 5% is heated above 55 °C, the transmittance drops sharply, which may be due to the phase transition to a metal phase, and the phase transition temperature is estimated to be 55 °C.

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The aluminum gallium oxide (AlxGa2−xO3) RRAM device is investigated in this report. The AlxGa2−xO3 layer is synthesized by thermal oxidation of the AlGaN epitaxy, and the AlxGa2−xO3 layer is treated by oxygen (O2) plasma. The endurance of AlxGa2−xO3 RRAM device is significantly improved by O2 plasma treatment. Besides, the retention time of AlxGa2−xO3 RRAM device with O2 plasma treatment for 90 min has persisted for 104 s. The fabricated AlxGa2−xO3 RRAM device presents potential for data storage.

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This report investigates the potential of laser ionization programming (hereafter LIP) to enhance the programming capability of a non-volatile memory (NVM) capacitor with lightly doped substrate, specifically a silicon-silicon oxide-silicon nitride-silicon oxide-silicon (SONOS) type. Laser-generated charges in the substrate of a SONOS-type NVM capacitor with lightly doped substrate (hereafter LDSONOSC) make them more easily programmable under laser ionization. The focus is on the performance of UV LIP on an LDSONOSC, which utilizes a UV transparent conductive gate and UV transparent nanocrystalline high-k gate dielectric, enabling the UV-LIP-LDSONOSC to store more data in a smaller space, ultimately enhancing their efficiency.

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This study focused on the influence of different annealing temperature of ZTO TFTs. Annealing can help reduce oxygen vacancies and cause the rearrangement of atoms. We found that the higher annealing temperature lead to better electrical properties. The threshold voltage shift to positive region and the on current of TFTs increase significantly. It also improved the subthreshold swing by reducing the interface traps. We successfully made annealing ZTO TFTs and their electrical properties have been discussed in this study.

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The transparent conducting N, Ag co-doped ZnO thin films were fabricated using the sol-gel spin-coating technique. This work explored the influence of Ag concentration, annealing temperature and time on the physical characteristics of ZnO thin films. The resulting ZnO films demonstrated p-type conductivity, boasting a remarkably low resistivity of 5.88 Ω·cm, coupled with an impressive average visible transmittance exceeding 89%. These engineered p-type ZnO thin films exhibit great potential for applications in optoelectronic devices.

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We train four machine learning (ML) models using chemical structures of the active materials based on donor-acceptor binary blend films for predicting the efficiency of organic photomultiplication (PM) type photodetectors. The results of the four ML models all exhibit high accuracies, suggesting the ML models are very promising for evaluating the organic molecules for PM-type organic photodetectors.

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This study investigates the photoelectrochemical (PEC) behavior of porous silicon (PSi) and its nickel (Ni)-coated hybrid system. Ni-coating significantly enhances PEC performance, attributed to catalytic activity, improved light absorption, and altered carrier transport. Scanning electron microscopy (SEM) analysis reveals distinct structures on PSi surfaces before and after Ni-coating, correlating with enhanced PEC performance due to intensified carrier mobility. Varying Ni coating times show optimal PEC at 15 minutes, potentially due to suitable structures enhancing electron-hole pairs separation.

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MAPbBr3 single crystal material was grown by inverse temperature growth method, and then MAPbBr3 perovskite quantum dots (QD-MAPbBr3) were synthesized by ligand-assisted precipitation method. The QD-MAPbBr3 was doped with anti-solvent and injected into the organic-inorganic perovskite active layer to improve the efficiency of solar cells.

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