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Two-Dimensional Fluorescent Strategy Based on Porous Silicon Quantum Dots for Metal-Ion Detection and Recognition
摘要： A two-dimensional photoluminescent (2D PL) detection strategy was established based on luminescent porous silicon (LuPSi) with wide-size-distributed silicon quantum dots and abundant surface chemistry. Owing to the intrinsic nature of LuPSi, interaction or reaction between analytes and LuPSi may cause static, dynamic, oxidation-induced, and deposition-induced quenching. By monitoring of both the PL intensity change and peak shift of LuPSi, the 2D PL detection strategy could discriminate di?erent analytes. Detection and recognition of di?erent metal ions in real water samples using a single peak were realized. Compared with the existing array-based methods, the 2D PL approach signi?cantly simpli?ed the sensing element and detection process.
关键词： metal ions,quantum dot array,two-dimensional photoluminescence,luminescent porous silicon,recognition
更新于2025-09-12 10:27:22
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CdTe Sensitized Nano Porous Electrode for Photovoltaic Application
摘要： CdTe quantum dots were synthesized using water as a solvent medium. Synthesized quantum dots were used to integrate into TiO2 nano-porous electrode using a combination of linker assisted direct adsorption and chemical bath deposition process. Sensitized electrodes were characterized to understand their physical and optical properties for photovoltaic application.
关键词： nano porous electrode,CdTe quantum dot
更新于2025-09-12 10:27:22
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Pulsed-laser-deposited lead sulfide nanoparticles based decoration of porous silicon layer as an effective passivation treatment for multicrystalline silicon
摘要： We report on the use of pulsed laser deposition (PLD) of PbS nanoparticles (PbS-NPs) on porous silicon layers in order to passivate multicrystalline silicon (mc-Si) substrates intended for solar cells applications. The porous silicon (PS) layer was first obtained through the electrochemical anodization of the mc-Si substrate, and then the PLD technique was used to decorate the PS layer by PbS-NPs at room temperature. By varying the number of laser ablation pulses (NLP) from 50 to 1200, the average size of the PbS-NPs was varied from ~2 nm to ~10 nm. The X-ray diffraction analysis has confirmed the crystalline quality of the PbS-NPs, whereas the transmission electron microscopy observations showed the uniform decoration of the PS by the PbS-NPs. By combining different characterization techniques, we were able to identify NLP = 200 as the optimal decoration condition that leads to the best passivation, in terms of the lowest surface reflectivity (of 15% at 500 nm wavelength), the highest PL intensity of the PS layer (centered around 633 nm) and the longest minority carrier lifetime (as long as ~430 μs versus 40 μs for the bare treated PS layer and 2.2 μs for the untreated bare mc-Si).
关键词： Pulsed laser deposition,Porous silicon,Solar cells,PbS nanoparticles,Surface passivation
更新于2025-09-12 10:27:22
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Fabrication and investigation of hybrid Perovskite solar cells based on porous silicon
摘要： The present work is a study of the effect of incorporating (CuO/PbI2/CH3NH3I/ZnO) on the porous silicon (p-Psi) by using the drop casting technique procedure at a temperature of 70 (cid:1)C. Structural, optical and morphological properties of (p-PSi, CuO, and ZnO) nanoparticles were characterized by X-ray diffraction, UV–Vis spectrophotometer, scanning electron microscopy and atomic force microscopy. The estimated optical energy value of thin films (CuO, PbI2, and ZnO) was (3.87, 2.3, and 4.1 eV), respectively. The results of the current–voltage test manifested that the maximum power conversion efficiency (PCE) of the solar cell was 8.21%, and the filling factor was 41.4%. This research is revealing and investigating the successful hybrid Perovskite solar cells based on the porous silicon.
关键词： Porous silicon,Perovskite,PCE,Nanoparticle,FSEM
更新于2025-09-12 10:27:22
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Experimental study of active phase change cooling technique based on porous media for photovoltaic thermal management and efficiency enhancement
摘要： The photoelectric conversion efficiency of solar cells was significantly influenced by its operating temperature which promotes the studies in thermal management for photovoltaic (PV). This paper introduced a novel cooling method based on porous media applied in PV panel for thermal management and efficiency enhancement. An active phase change (APC) cooling system has been designed and fabricated to explore the possibility of cooling the PV panel, and ethanol was considered as the working fluid. By laboratory test, average temperature, temperature distribution, electrical performance of the PV panel as well as energy and exergy efficiency were analyzed in detail. The results demonstrated that the average temperature of the PV panel can be better managed by the APC cooling method compared with the uncooled conditions at different irradiation levels. Besides, increasing the non-condensable gas flow rates has a positive effect on the temperature reduction and maximum generated power of the PV panel. The obtained three-dimensional temperature distribution map proved that the temperature distribution was well uniform with the maximum temperature difference less than 5 °C. The maximum specific power improvement and percentage improvement in power generation were 21.37 W/m2 and 19.32%, respectively.
关键词： Photovoltaic,Efficiency enhancement,Active phase change,Thermal management,Porous media
更新于2025-09-12 10:27:22
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Electrodeposition of porous CuSCN layers as hole-conducting material for perovskite solar cells
摘要： One of the most promising among hole-conducting materials, CuSCN, was prepared for the first time in a form of porous layers for potential applications in inverted perovskite solar cells.
关键词： porous CuSCN,perovskite solar cells,electrodeposition,hole-conducting material
更新于2025-09-12 10:27:22
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[IEEE 2019 European Space Power Conference (ESPC) - Juan-les-Pins, France (2019.9.30-2019.10.4)] 2019 European Space Power Conference (ESPC) - Space III-V Multijunction Solar Cells on Ge/Si virtual substrates
摘要： Virtual substrates based on thin Ge layers on Si substrates by direct deposition have recently achieved high quality. In this work, their application as low cost, removable substrates for the growth of high efficiency, lightweight and flexible multijunction solar cells for space applications is analyzed. Experimental Ge single-junction solar cells and GaInP/Ga(In)As/Ge triple-junction solar cells using the Ge/Si virtual substrate as an active bottom junction (being the Si inactive), are implemented using medium quality Ge/Si virtual substrates with a 5 μm Ge layer thickness. A lower quality in the Ge material, as compared to standard substrates, but enough carrier collection efficiency for a standard triple-junction, are shown. The expected formation of cracks during growth, due to the large thermal expansion coefficient mismatch with the Si substrate, is confirmed, and is found to be a major limiting factor for the performance of the solar cells. Strategies such as thinning the Ge + III-V structure and minimizing the thermal cycling during growth are discussed. Using an embedded porous Si layer to serve as buffer for the strain is being investigated. This porous layer could also serve as sacrificial layer for high throughput mechanical epitaxial lift-off in the manufacturing of lightweight and flexible multijunction cells. These embedded porous Si layers need to be engineered for optimum performance and compatibility with the Ge and III-V deposition processes.
关键词： lightweight solar cell,III-V multijunction solar cell,porous silicon,virtual substrate
更新于2025-09-12 10:27:22
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Light-driven motion of self-propelled porous Janus particles
摘要： We introduce a versatile mechanism of light-driven self-propelled motion applied to porous Janus-type particles. The mechanism is based on the generation of local light-driven diffusio-osmotic (l-LDDO) flow around each single porous particle subjected to suitable irradiation conditions. The photosensitivity is introduced by a cationic azobenzene containing surfactant, which undergoes a photoisomerization reaction from a more hydrophobic trans-state to a rather hydrophilic cis-state under illumination with light. The negatively charged porous silica particles are dispersed in a corresponding aqueous solution and absorb molecules in their trans-state but expel them in their cis-state. During illumination with blue light triggering both trans-cis and cis-trans isomerization at the same time, the colloids start to move due to the generation of a steady-state diffusive flow of cis-isomers out of and trans-isomers into the particle. This is because a hemi-spherical metal cap partially sealing the colloid breaks the symmetry of the otherwise radially directed local flow around the particle, leading to self-propelled motion. Janus particles exhibit superdiffusive motion with a velocity of (cid:2)0.5 lm/s and a persistence length of ca. 50 lm, con?ned to micro-channels the direction can be maintained up to 300 lm before rotational diffusion reverts it. Particles forming dimers of different shapes can be made to travel along circular trajectories. The unique feature of this mechanism is that the strength of self-propulsion can be tuned by convenient external optical stimuli (intensity and irradiation wavelength) such that a broad variety of experimental situations can be realized in a spatiotemporal way and in situ.
关键词： porous Janus particles,photoisomerization,light-driven motion,self-propelled,diffusio-osmotic flow
更新于2025-09-12 10:27:22
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Improving the photoelectrical conversion efficiency of silicon solar cells using ZnO:Al/porous silicon double antireflective layers
摘要： In this work, porous silicon (PS) layers are performed on the front side of n+p wafer via electrochemical etching technique (etching times of 15 and 25 min), using isopropanol as solvent, followed by covering with Al-doped ZnO (AZO) films prepared by sol–gel spin-coating method. AZO/PS double layers are found to have incomparable photoluminescence and reflectance characteristics required for the use as antireflection. The structural, optical properties of PS, AZO and AZO/PS have been investigated. The results show that the energy bandgap of PS layer is higher than that of nonporous Si and increases slightly with increasing the etching time. X-ray diffraction shows that the prepared AZO films have nanostructure character with hexagonal structure. The optical properties of AZO films are studied in terms of measuring the transmittance and reflectance over wavelength range 200–2500 nm. Using these parameters, the absorption coefficient and refractive index of AZO films are calculated and the related parameters are estimated. AZO films deposited on PS/n+p exhibit low reflectance compared to n+p and AZO/n+p systems. The improvement of the solar cells performance due to the effect of porosity and AZO films deposition are investigated in which the solar cells parameters are evaluated and discussed.
关键词： Porous silicon,Solar cells,Antireflective layers,Photoelectrical conversion efficiency,Al-doped ZnO
更新于2025-09-12 10:27:22
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Selective Laser Melting Titanium with nanonet topography inhibits osteoclast differentiation through MAPK signaling pathway
摘要： Penetrating into the inner surface of porous metal-oxide nanostructures to encapsulate the conductive layer is an efficient but challenging route to exploit high-performance lithium-ion battery electrodes. Furthermore, if the bonding force on the interface between the core and shell was enhanced, the structure and cyclic performance of the electrodes will be greatly improved. Here, vertically aligned interpenetrating encapsulation composite nanoframeworks were assembled from Cl?/SO3 2?-codoped poly(3,4-ethylenedioxythiophene) (PEDOT) that interpenetrated and coated on porous Fe2O3 nanoframeworks (PEDOT-IE-Fe2O3) via a one-step Fe3+-induced in situ growth strategy. Compared with conventional wrapped structures and methods, the special PEDOT-IE-Fe2O3 encapsulation structure has many advantages. First, the codoped PEDOT shell ensures a high conductive network in the composites (100.6 S cm?1) and provides interpenetrating fast ion/electron transport pathways on the inner and outer surface of a single composite unit. Additionally, the pores inside offer void space to buffer the volume expansion of the nanoscale frameworks in cycling processes. In particular, the formation of Fe?S bonds on the organic?inorganic interface (between PEDOT shell and Fe2O3 core) enhances the structural stability and further extends the cell cycle life. The PEDOT-IE-Fe2O3 was applied as lithium-ion battery anodes, which exhibit excellent lithium storage capability and cycling stability. The capacity was as high as 1096 mA h g?1 at 0.05 A g?1, excellent rate capability, and a long and stable cycle process with a capacity retention of 89% (791 mA h g?1) after 1000 cycles (2 A g?1). We demonstrate a novel interpenetrating encapsulation structure to highly enhance the electrochemical performance of metal-oxide nanostructures, especially the cycling stability, and provide new insights for designing electrochemical energy storage materials.
关键词： porous Fe2O3,lithium-ion battery,PEDOT,organic?inorganic interface,interpenetrating encapsulation
更新于2025-09-11 14:15:04