- 标题
- 摘要
- 关键词
- 实验方案
- 产品
-
Study of some sensitizers for gel polymer electrolyte based sensitized solar cells (SSCs)
摘要： The performance of phthaloychitosan gel polymer electrolyte (GPE) based sensitized solar cells (SSCs) fabricated with different types of sensitizer have been studied in this work. Five types of sensitizer were used viz., curcumin, chlorophyll, (E)-4-hydroxyl-3-((4-iodophenyl)diazenyl)-2H-chromen-2-one (CAD5), (E)-4-hydroxyl-3-((4-methoxyphenyl) diazenyl)-2H-chromen-2-one (CAD7) and cadmium sulphide (CdS). These sensitizers were designated as S1, S2, S3, S4 and S5 respectively. The performance of the sensitized solar cells (SSCs) has been characterized and the experimental results showed that S1 (SSC fabricated with curcumin dye sensitizer) exhibits the best performance with short circuit current density (Jsc) of 3.18 mA cm-2, open circuit voltage (Voc) of 0.41 V, fill factor (FF) 0.57 and power conversion efficiency (PCE) of 0.73%.
关键词： Gel polymer electrolyte,Electrochemical impedance spectroscopy,Sensitizers,Sensitized solar cells
更新于2025-09-12 10:27:22
-
Improved long-term stability of dye-sensitized solar cell employing PMA/PVAc based gel polymer electrolyte
摘要： Gel polymer electrolytes based on blends of poly(methyl acrylate) (PMA) and poly(vinyl acetate) (PVAc) were prepared using tetrapropylammonium iodide (TPAI) salt, 1-butyl-3-methylimidazolium iodide (BMII) ionic liquid and ethylene carbonate (EC) plasticizer. The mass fraction of EC, WEC was varied while the masses of the other components were kept constant in order to study the dependence of dye-sensitized solar cell (DSSC) performance on EC concentration. Incorporation of EC in PMA/PVAc-TPAI-BMII has enhanced the e?ciency of the DSSC. The e?ciency enhancement is due to the increase in short circuit current density, Jsc, arising from the conductivity enhancement brought about by the EC. A DSSC with TPAI-BMII-EC liquid electrolyte was fabricated and its photovoltaic and stability performance were investigated and compared with DSSC with PMA/PVAc-TPAI-BMII-EC gel electrolyte. PMA/PVAc decreases the Jsc from 27.87 to 22.91 mA cm?2 and e?ciency, η from 12.28 to 9.67%. Linear sweep voltammetry studies reveal that PMA/PVAc decreases the ion motion in the electrolyte. Although PMA/PVAc deteriorates the performance of DSSC, but it improves the stability performance of DSSC by suppressing the recombination loss as evidenced from the increase in charge transfer resistance at the TiO2 electrode and longer electron recombination lifetime.
关键词： PVAc,Gel polymer electrolyte,PMA,Stability,Dye-sensitized solar cells
更新于2025-09-12 10:27:22
-
Ultraviolet photodetectors based on doped ZnO films
摘要： In this paper, we report the realization of ultraviolet (UV) photodetector based on doped ZnO films. The ZnO p-n junction was fabricated on indium tin oxide (ITO) coated glass, which consists of n-type and p-type layers based on Ga-doped (2 at.%) and N-doped (20 at.%) ZnO films, respectively. The current-voltage (IV) characteristics, photosensitivity, photoresponsitivity, and photocurrent gain were derived to determine the performance of the device. At 5 V reverse bias, the ZnO-based UV photodetector exhibits photosensitivity of 10.9, photoresponsivity of 2.1 × 10-2 AW-1, and photoconductive gain of 7.2 × 10-2.
关键词： ultraviolet photodetectors,sol-gel spin coating,p-n junction,doped ZnO films
更新于2025-09-12 10:27:22
-
Transforming polymorphs of Co-doped TiO2 nanoparticles: an efficient photo-electrode for dye-sensitized solar cells
摘要： Simple sol–gel assisted spin coating technique was used to prepare cobalt-doped TiO2 films for the application of dye-sensitized solar cells (DSSC). TiO2 photo-electrodes with few Co concentrations (0, 0.025, 0.05, 0.075 and 0.1 M) were prepared on conducting glass substrates. The morphology, structure and composition of the Co:TiO2 films were observed using SEM, XRD and EDAX analysis. The average crystallite size of Co:TiO2 nanoparticles obtained from diffractograms are in the range of 3–12 nm. The transformation of polymorphs from anatase to rutile and vice versa for the increasing concentrations of Co in TiO2 films is observed. The values of optical bandgap energy for Co-doped films are observed to be higher than the pure TiO2 film and the highest is for the dopant level of 0.025 M. Doping of 0.1 M Co in TiO2 enhances the power conversion efficiency of DSSC by 65% compared to pure TiO2 film, demonstrating the influence of Co doping on the functioning of DSSC.
关键词： TiO2,Co-doped TiO2,Sol–gel,DSSC,Spin coating technique
更新于2025-09-12 10:27:22
-
Development of a Hybrid Chitosan- and Niacinamide-Coupled ZnO Nanoparticle Composite for Sun Protection Application
摘要： Zinc oxide nanoparticles (ZnO) have long been utilized as UV-protective sunscreen components due to their high durability and lower skin irritation while maintaining capability for blocking UV rays. However, the dispersal and transparency properties of ZnO need to be enhanced in order to improve the capacity for creating effective sunscreen through control of the physiochemical properties of ZnO. In this study, chitosan or niacinamide, which are suitable functional cosmetic compounds and effective skin lightening agents, are combined with ZnO for the development of better UV-protective products. Each biocompatible coating material is individually attached on its surface after the synthesis of ZnO. The size is 70 nm using the sol-gel method. Their morphology and chemical structure are characterized by FT-IR, XRD, SEM, TEM, TGA, and zeta potential. The results indicate that approximately 50% of chitosan and 5% niacinamide were coated on the ZnO. To confirm the capacity of each surface-coated ZnO with chitosan and niacinamide as a sunscreen, we measured their transmission, reflectance, and sun protection factor (SPF) using a UV spectrophotometer and SPF. As a result, the niacinamide-coated ZnO shows remarkably lower transmission and high reflectance against UV rays than that of bare ZnO and chitosan-coated ZnO. Furthermore, niacinamide-coated ZnO exhibits great lightening effects. Consequently, these results demonstrate that niacinamide coating is highly effective for the production of sunscreen emulsions.
关键词： Zinc oxide nanoparticles,TEM,FT-IR,SEM,XRD,UV-protective sunscreen,TGA,chitosan,SPF,sol-gel method,zeta potential,niacinamide,sun protection factor
更新于2025-09-12 10:27:22
-
Preparation of novel lead-free Ag-doped glass frit for polycrystalline silicon solar cells by sol-gel method
摘要： A novel Ag-doped glass frit is prepared by the sol-gel method. Nitrogen adsorption-desorption isotherms indicate that the frit has a large BET surface area and a small particle size which promotes front contact metallization. When the glass frit is used for the front contact electrode of polycrystalline silicon solar cells (pc-Si solar cells), it exhibits excellent wettability and etching results on the SiNx layer and the Si substrate. The pc-Si solar cells with the as-prepared frit has a better photoelectric conversion efficiency (18.2%) and is 0.8% higher than the solar cells using the conventional frit, which is due to the frit will produce a lot of Ag nanocrystals at the interface of the glass layer, promoting the formation of excellent ohmic contact between the Ag electrode and n-Si layer, and reducing the contact resistance of solar cells.
关键词： Ag-doped glass frit,polycrystalline silicon solar cells,photoelectric conversion efficiency,sol-gel method
更新于2025-09-12 10:27:22
-
Plasmonic Microneedle Arrays for in situ Sensing with Surface-Enhanced Raman Spectroscopy (SERS)
摘要： Surface-enhanced Raman spectroscopy (SERS) is a sensitive, chemically specific, and short-time response probing method with significant potential in biomedical sensing. This paper reports the integration of SERS with microneedle arrays as a minimally invasive platform for chemical sensing, with a particular view towards sensing in interstitial fluid (ISF). Microneedle arrays were fabricated from a commercial polymeric adhesive and coated with plasmonically active gold nanorods that were functionalized with the pH-sensitive molecule 4-mercaptobenzoic acid. This sensor can quantitate pH over a range of 5 to 9 and can detect pH levels in an agar gel skin phantom and in human skin in situ. The sensor array is stable and mechanically robust in that it exhibits no loss in SERS activity after multiple punches through an agar gel skin phantom and human skin or after a month-long incubation in phosphate-buffered saline. This work is the first to integrate SERS-active nanoparticles with polymeric microneedle arrays and to demonstrate in situ sensing with this platform.
关键词： SERS,agar gel skin phantom,pH in situ sensing,human skin,Plasmonic microneedle arrays
更新于2025-09-12 10:27:22
-
Photo-Patternable Quantum Dots/Siloxane Composite with Long-Term Stability for Quantum Dot Color-Filters
摘要： Incorporation of quantum dots (QDs) into color-filters (CFs) are desired for less energy loss and wider viewing angle compared to conventional display. However, aggregation and vulnerability to heat, moisture, and chemicals in photo-patternable matrix are critical issues of the QD-CFs with high QDs concentration. Herein, we fabricated red (10 wt%) and green (20 wt%) QD-CFs using photolithography of QD/siloxane ink containing secondary thiol monomer. Ligand exchanged QDs were chemically incorporated in methacrylate oligo-siloxane resin. QD/siloxane composite showed superior stability under harsh heat and moisture (85 ℃/5% RH and 85 ℃/85% RH) conditions and chemicals (EtOH, HCl and NaOH) compared to conventional QD/PR (commercial negative photoresist). 10 μm-thick QD-CFs effectively converted blue light emitted from LED chip into red and green light, and the obtained white PL through QD-CF showed wide color gamut which was 108% relative to NTSC. From these advantages, QD/siloxane composite will be beneficial as color-conversion photoresist to be used as color-filters in LCDs, μLEDs, and OLEDs.
关键词： Sol-gel condensation,Siloxane hybrids,Photo-patternability,Quantum dot color-filter,Thermal and chemical stability
更新于2025-09-12 10:27:22
-
The role of cation and anion dopant incorporated into a ZnO electron transporting layer for polymer bulk heterojunction solar cells
摘要： Doping is a widely-implemented strategy for enhancing the inherent electronic properties of charge transport layers in photovoltaic devices. A facile solution-processed zinc oxide (ZnO) and various cation and anion-doped ZnO layers were synthesized via the sol–gel method and employed as electron transport layers (ETLs) for inverted polymer solar cells (PSCs). The results indicated that all PSCs with doped ZnO ETLs exhibited better photovoltaic performance compared with the PSCs with a pristine ZnO ETL. By exploring the role of various anion and cation dopants (three compounds with the same Al3+ cation: Al(acac)3, Al(NO3)3, AlCl3 and three compounds with the same Cl? anion: NH4Cl, MgCl2, AlCl3), we found that the work function changed to favor electronic extraction only when the Cl anion was involved. In addition, the conductivity of ZnO was enhanced more with the Al3+ cation. Therefore, in inverted solar cells, doping with Al3+ and Cl? delivered the best power conversion efficiency (PCE). The maximum PCE of 10.38% was achieved from the device with ZnO doped with Al+ and Cl?.
关键词： electron transport layers,Al3+ cation,polymer solar cells,doping,Cl? anion,photovoltaic performance,power conversion efficiency,sol–gel method,zinc oxide
更新于2025-09-12 10:27:22
-
Effect of annealing temperature on silicon-based MoS <sub/>x</sub> thin film solar cells
摘要： A suitable annealing temperature was found by adopting the sol–gel method to prepare silicon-based molybdenum sulfide film heterojunction solar cells. As shown by the results, a change in the efficiency of the solar cells, which was attributed to the fact that as the annealing temperature rises, the degree of crystallization of the film increases continuously, the degree of order of the crystal particles goes up first and then goes down, and the temperature change affects the proportion of Mo in different valence states. By comparison, it was found that when the temperature reached 500 °C, the degree of order of the film was raised and the film was in the initial zone from the amorphous to the microcrystal phase change and the proportion of Mo 6+ was relatively large, increasing the conversion efficiency of the device power to 7.55% and laying a good basis for preparing high-performance solar batteries made in the two-dimensional materials. When the annealing temperature continues to rise, the intergranular defects increase, and the overall degree of order of the film decreases. Furthermore, the highly crystalline thin films and the improvement in the device efficiency can be controlled if we obtained the relationship between the annealing temperature and the layers of the two-dimensional materials.
关键词： annealing temperature,solar cells,crystallization,sol–gel method,silicon-based MoSx thin film
更新于2025-09-12 10:27:22