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TiO2/Cu2O heterojunctions for photovoltaic cells application produced by reactive magnetron sputtering
摘要： In this work, TiO2/Cu2O heterostructures were obtained in a two-step process with a direct current magnetron sputtering method. We studied the morphological properties and composition of the thin films by scanning electron microscopy. Optical properties and energy bands at the heterojunction were recorded using a spectrophotometer. Additionally, the current–voltage characteristics examined in both total darkness and with illumination were estimated to have an irradiation (radiation flux divided by area) of 1000 W/m2.
关键词： Titanium dioxide,Thin film,Solar cells,Cuprous oxide,Photovoltaic cells
更新于2025-09-16 10:30:52
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Influence of Calcination Temperature on the Performance of TiO<sub>2</sub> Films in Dye-Sensitized Solar Cells
摘要： In this work, the effects of calcination temperature on the photovoltaic performance of TiO2 films prepared with non-hydrolytic sol-gel method were reported. The optimal photovoltaic performance of DSCs was obtained by annealing TiO2 film at 550 °C. The short-circuit current (Jsc), open-circuit voltage, fill factor (FF) and energy conversion efficiency were 15.68 mA·cm-2, 0.71 V, 0.62 and 6.83%, respectively.
关键词： dye-sensitized solar cell,photoanode film,performance,calcination temperature,non-hydrolytic sol-gel titanium dioxide
更新于2025-09-16 10:30:52
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Effect of Electrical Resistance of TiO<sub>2</sub> Layer Characteristics of Dye Sensitized Solar Cell Using Chlorophyll as a Sensitizer
摘要： The third generation of solar cells found by Gratzel in 1991 was called Dye-sensitized Solar Sell (DSSC). DSSC is composed of five parts, namely transparent conductive glass as a substrat; titanium dioxide as a semiconductor materials; chlorophyll as a dye sensitizer, carbon as a catalyst which can convert energy of light into electrical energy. Characterization of DSSC will be carried out in this research covering electrical characterization using RLC meter & I-V meter, optical characterization using Spectrophotometer. TiO2 nanoparticle in anatase phase having size of 13 nm used in this experiment was synthesized by co-precipitation method. Photoanode with thickness of 10 μm has the lowest resistance compared to the other thickness of 30 μm and 50 μm. The device applying photoanode of 10 μm shows the highest efficiency up to 0.1141 %, while those with other thicknesses respectively gives 0.0378%, and 0,0283%, revealing the efficiency becomes lower with the increasing thickness of TiO2.
关键词： Titanium Dioxide,Chlorophyll,dye,Resistance
更新于2025-09-16 10:30:52
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Role of long persistence phosphors on their enhancement in performances of photoelectric devices: in case of dye-sensitized solar cells
摘要： To enhancing enhanced sunlight harvesting, long persistence phosphor (LPP) materials were often incorporated into photoanodes of photoelectric devices. However, the role of LPP layer on the photoelectric enhancements is not yet clear. Here, the authors have systematically studied the effect of green LPP (SrAl2O4: Eu3+) and its thickness on photoelectric behaviours of dye-sensitized solar cells (DSSCs). Results showed that the P25/LPP DSSCs generates power conversion efficiency (PCE) of 7.16 % at the optimal LPP thickness, which is 24.3% higher than that of the P25 ones. Series of analysis indicate that the enhancements in short-circuit current density and PCE could mainly be due to the LPP’s function of back scattering (containing down-conversion effect and enhancement in light absorption) of incident sunlight. Moreover, the enhanced carriers’ lifetime and open-circuit voltage are mainly due to the LPP layer’s afterglow effect. In addition, the P25/LPP DSSCs can still generate an output power density (82.15 μW cm-2) with a high PCE value of 46.94% in dark.
关键词： Back scattering,Power conversion efficiency,Down conversion,Long persistence phosphors,Titanium dioxide (P25),Dye-sensitized solar cells
更新于2025-09-16 10:30:52
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Effect of CdSe thickness deposited by electrophoretic deposition for quantum-dot-sensitized solar cell
摘要： Cadmium selenide (CdSe) and titanium dioxide (TiO2) nanoparticles in chloroform were deposited on fluorine-doped tin oxide (FTO) conducting glass-substrate by the electrophoretic deposition (EPD) method at varying voltages and deposition times. Firstly, TiO2 nanoparticles were deposited on FTO conducting glass-substrate at 150 V for 30 s by EPD method. After that, CdSe was deposited on TiO2 layer at 100 V for 60 s, 90 s, and 120 s by EPD method. The CdSe/TiO2 films were characterized using UV-visible spectroscopy (UV-vis) and scanning electron microscope (SEM). A complete quantum-dots-sensitized solar cells (QDSSCs) were assembled using polysulfide electrolyte and Cu2S counter electrodes. Polysulfide electrolyte was prepared with mixture of sulphur, sodium hydroxide and methanol/deionized water. The power conversion efficiency of 2% was achieved using a CdSe/TiO2 (100 V, 120 s) electrode, under simulated AM 1.5, 100 mW cm-2 illumination.
关键词： Cadmium selenide nanoparticles,quantum dots sensitized solar cell,electrophoretic deposition,titanium dioxide nanoparticles
更新于2025-09-16 10:30:52
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Titanium Dioxide (Production, Properties and Effective Usage 2nd Revised Edition) || 9. Titanium dioxide in photovoltaic cells and chromatography
摘要： Solar cells convert the energy of light into electrical energy. State of the art silicium cells have, depending upon their design, an efficiency (the relation between delivered electrical power and the power of the incident light; physical dimension of both: Watt) of 10 to 22 %, in general about 15 %. The construction of silicium solar cells is, however, somewhat expensive because of the high purity of the silicium necessary, which is ensured by zone refining. In this process, the silicium raw crystal is drawn as a strand through a zone oven. The impurities collect in the melted front and are discarded before the purified material is processed. The so called “energetic payback time”, that is the time in operation that a solar cell needs in order to regenerate the energy that was necessary for its production, is about seven years. High hopes were therefore laid into inexpensive solar cells that were first introduced by Gr?tzel (ETH Lausanne, Switzerland) [1, 2]. They were supposed to cost only one tenth of the silicium based solar cells at a comparable performance.
关键词： solar cells,photovoltaic cells,HPLC,Titanium dioxide,chromatography,Gr?tzel cell
更新于2025-09-16 10:30:52
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Fabrication of Titanium Dioxide-reduced Graphene Oxide (TiO <sub/>2</sub> /rGO) nanocomposites as the Photoanode in Dye Sensitized Solar Cells
摘要： One of the photovoltaic cells generation promising for low-cost fabrication is dye-sensitized solar cell (DSSC). However, it has a drawback─low efficiency because of electron recombination occurrence and low transparency of photoanode. Graphene-based materials show the potential to overcome this problem. In this work, we have investigated the integration of reduced graphene oxide (rGO) into the titanium dioxide (TiO2) photoanode in DSSC. A simple Hummer’s method has been used to synthesize graphene oxide flakes. The nanocomposite of rGO/TiO2 has been formed by varying the percentage of rGO between 1% and 5%. The result shows that the percentage of rGO in nanocomposite affected device performance. The efficiency decreases along with the increase in rGO. The best result was obtained with 2 wt% addition of rGO into TiO2 photoanode that resulted in 0.9 % efficiency.
关键词： Dye-sensitized solar cell,titanium dioxide,nanocomposite,reduced graphene oxide,photoanode
更新于2025-09-16 10:30:52
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The Influence of Photoinduced Processes on a Quantum Dot Surface on the Electron Transfer Efficiency in TiO2 Nanoparticle/Quantum Dot Structures
摘要： The influence of photoinduced processes occurring on the surfaces of CdSe/ZnS quantum dots is considered in relation to the functional characteristics of hybrid TiO2 nanostructure/quantum dot systems. Preirradiation of quantum dots is shown to achieve a threefold increase in electron transfer efficiency within these structures. Photoinduced processes are found to impact both the efficiency of nonradiative phenomena in quantum dots and the electron transfer in the indicated systems.
关键词： photoinduced processes onto quantum dots,photoinduced electron transfer,photoactivation,semiconducting quantum dots,hybrid structures,titanium dioxide nanoparticles
更新于2025-09-16 10:30:52
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Rapid Room-Temperature Synthesis of Mesoporous TiO2 Sub-Microspheres and Their Enhanced Light Harvesting in Dye-Sensitized Solar Cells
摘要： Submicron sized mesoporous spheres of TiO2 have been a potential alternative to overcome the light scattering limitations of TiO2 nanoparticles in dye‐sensitized solar cells (DSSCs). Currently available methods for the growth of mesoporous TiO2 sub‐microspheres involve long and relatively high temperature multi‐stage protocols. In this work, TiO2 mesoporous sub‐microspheres composed of ~5 nm anatase nanocrystallites were successfully synthesized using a rapid one‐pot room‐temperature CTAB‐based solvothermal synthesis. X‐Ray Diffraction (XRD) showed that the grown structures have pure anatase phase. Transmission electron microscopy (TEM) revealed that by reducing the surfactant/precursor concentration ratio, the morphology could be tuned from monodispersed nanoparticles into sub‐micron sized mesoporous beads with controllable sizes (50–200 nm) and with good monodispersity as well. The growth mechanism is explained in terms of the competition between homogeneous nucleation/growth events versus surface energy induced agglomeration in a non‐micelle CTAB‐based soft templating environment. Further, dye‐sensitized solar cells (DSSCs) were fabricated using the synthesized samples and characterized for their current‐voltage characteristics. Interestingly, the DSSC prepared with 200 nm TiO2 sub‐microspheres, with reduced surface area, has shown close efficiency (5.65%) to that of DSSC based on monodispersed 20 nm nanoparticles (5.79%). The results show that light scattering caused by the agglomerated sub‐micron spheres could compensate for the larger surface areas provided by monodispersed nanoparticles.
关键词： CTAB,light scattering,surfactant,titanium dioxide,dye‐sensitized solar cells,anatase
更新于2025-09-16 10:30:52
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Synthesis of N-doped TiO <sub/>2</sub> /SiO <sub/>2</sub> /Fe <sub/>3</sub> O <sub/>4</sub> magnetic nanocomposites as a novel purple LED illumination-driven photocatalyst for photocatalytic and photoelectrocatalytic degradation of naproxen: optimization and different scavenger agents study
摘要： N-doped TiO2/SiO2/Fe3O4 as a new magnetic photocatalyst that is active in visible light has been prepared by simple sol–gel method. The prepared samples were characterized by XRD, FESEM, EDX, TEM, BET, BJH, VSM, XPS, FT-IR, and DRS–UV/Vis analysis. The photocatalytic effect of synthesized samples on naproxen degradation was studied. The operational parameters were optimized through central composite design to achieve maximum efficiency. The optimum values for maximum efficiency were obtained at pH of 4.29, catalyst mass of 0.06 g, naproxen concentration of 9.33 mg L(cid:1)1, and irradiation time of 217.06 min. At these optimum conditions, the maximum photocatalytic degradation percentages of naproxen were found to be 96.32% at desirability function value of 1.0. Coupling the electrical current with the photocatalytic process proved that the electrical current was considerably efficient in decreasing the degradation time of removing the naproxen from aqueous solutions. The photocatalytic activity of the nanoparticles was also studied under sunlight. Considering the results provided by UV–Vis spectrophotometry and total organic carbon, it was found that the prepared samples are extraordinarily efficient to degrade naproxen under both purple LED and solar lights. Furthermore, the effect of different scavenger agents on naproxen degradation has been studied.
关键词： pharmaceutical compound,experimental design,Photodegradation,core–shell nanocomposite,titanium dioxide
更新于2025-09-16 10:30:52