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Grafting cobalt sulfide on graphene nanosheets as a counterelectrode for dye-sensitized solar cells
摘要： In the present work a composite counter electrode of graphene nanosheets grafted cobalt sulfide was fabricated through a facile synthetic route, in which cobalt sulfide nanoparticles were successfully grafted on the surface of graphene nanosheets. Used as a counter electrode in DSSC, a power conversion efficiency of 7.28% can be achieved. Such a result might be contributed to the facts that this counter electrode composed of graphene nanosheets grafted cobalt sulfide has a good stability and electrochemical catalytic performance toward triiodide reduction reaction.
关键词： photovoltaic performance,graphene nanosheets,cobalt sulfide,counterelectrode,Dye-sensitized solar cell
更新于2025-11-14 17:04:02
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Bulk luminescent solar concentrators based on organic-inorganic CH3NH3PbBr3 perovskite fluorophores
摘要： In this paper, we report characterization and performance results of lead bromide perovskite luminescent solar concentrator. CH3NH3PbBr3 fluorophores are synthesized by sonication method and examined by their X-ray diffraction pattern and scanning electron microscopy. Synthesized perovskite shows excitonic absorption at 524 nm and PL emission peak located at 532 nm with a Stokes shift around 8 nm. Micron-sized fluorophores are dissolved in prepared solutions and uniformly embedded in PMMA host with 0.006–0.120%wt concentration. Then, Fabricated devices are cut into 50 × 30 × 5 mm cuboid shapes and placed in a mirror surrounded configuration with an attached photovoltaic cell. Fabricated device is put under standard AM1.5 illumination and the output spectrum from the concentrator is acquired. Re-absorption in the samples is also measured by variable optical path method, showing red-shifts up to 13 nm in the output spectrum. Spatially resolved photo-luminescence maps and optical efficiencies are also presented for each sample. Plus, a Monte-Carlo ray tracing algorithm is developed to assist better understanding the experimental results. Stability of fabricated samples are evaluated under high intensity UV illumination, reporting efficiency reduction around 15% after 24 h. Finally, Comparing current-voltage characterization of the attached photovoltaic cell reveals optimized efficiency enhancement in the 0.04%wt sample above 65%.
关键词： Perovskites,Monte-Carlo simulation,Re-absorption,Luminescent solar concentrators,Photovoltaic conversion efficiency,Solar cells
更新于2025-11-14 15:30:11
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Stabilizing silver window electrodes for organic photovoltaics using a mercaptosilane monolayer
摘要： A single layer of the bifunctional molecule 3-mercaptopropyltrimethoxysilane is shown to be remarkably effective at improving the stability of optically thin silver film electrodes towards spontaneous morphological change and oxidation by airborne sulfur. Inclusion of this layer in the novel transparent electrode; WO3 (30 nm) / silver (13 nm) / sol-gel ZnO (27 nm), at the silver / ZnO interface improves the efficiency of organic photovoltaic devices using this electrode by 20%, such that the power conversion efficiency is very close to that achievable using a conventional indium-tin oxide glass electrode; 9.6 % – 0.2 % vs 10.0 % – 0.3 %, with the advantage that the silver electrode has a sheet resistance one third that of the ITO glass ((cid:3)4 Ohms sq-1). The mercaptosilane monolayer is also shown to retard silver diffusion into the ZnO layer whilst imparting a favorable (cid:3)400 meV reduction in electrode work function. In addition to its utility inside the device, this molecular layer is shown to be useful for improving the stability of the silver film electrodes in top-illuminated semi-transparent photovoltaics, since it can be deposited directly onto a completed device from the vapor phase.
关键词： organic photovoltaic,silane,transparent electrode,silver electrode,3-mercaptopropyltrimethoxysilane,Monolayer,work function,organic solar cell
更新于2025-11-03 10:59:25
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[IEEE 2018 IEEE 7th World Conference on Photovoltaic Energy Conversion (WCPEC) (A Joint Conference of 45th IEEE PVSC, 28th PVSEC & 34th EU PVSEC) - Waikoloa Village, HI, USA (2018.6.10-2018.6.15)] 2018 IEEE 7th World Conference on Photovoltaic Energy Conversion (WCPEC) (A Joint Conference of 45th IEEE PVSC, 28th PVSEC & 34th EU PVSEC) - Plasma Texturing of Silicon Wafers and Finished Solar Cell for Mass Production
摘要： Standard plasma texturing of silicon wafers are not widely introduced within mass production due to several challenges which have to be overcome before implementation i.e. surface contamination, surface near damaging due to ion bombardment, and surface passivation. Within this contribution we will show our current status to overcome these challenges. We will present that the electrical and optical properties of ICP only plasma textured samples are sufficient for solar cell production. Since in ICP processes the ion bombardment is low we also will discuss our current understanding of the plasma process based on experimental results of the self-masking process. Furthermore, a new plasma texturing approach texturing the SiN layer of finished solar cells is introduced for the first time which overcome all problems introduced by the plasma texturing of bare solar wafers.
关键词： Plasma materials processing,silicon,SiN texturing,Plasma texturing,photovoltaic cells
更新于2025-10-22 19:40:53
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Effects of fluorination and thermal annealing on charge recombination processes in polymer bulk-heterojunction solar cells
摘要： We investigate the effect of fluorination on the photovoltaic properties of an alternating conjugated polymer composed of 4,8-di-2-thienylbenzo[1,2-b:4,5-b0]dithiophene and 4,7-bis([2,20-bithiophen]-5-yl)-benzo-2-1-3-thiadiazole (4TBT) units in bulk-heterojunction solar cells. The unsubstituted and fluorinated polymers afford very similar open-circuit voltages and fill factor values, but the fluorinated polymer performed better due to enhanced aggregation which provides a higher photocurrent. The photovoltaic performance of both materials improved upon thermal annealing at 150–200 °C as a result of a significantly increased fill factor and open-circuit voltage, counteracted by a slight loss in photocurrent. Detailed studies of the morphology, light intensity dependence, external quantum efficiency and electroluminescence allowed the exploration of the effects of fluorination and thermal annealing on the charge recombination and the nature of the donor–acceptor interfacial charge transfer states in these films.
关键词： polymer bulk-heterojunction solar cells,thermal annealing,charge recombination,fluorination,photovoltaic properties
更新于2025-10-22 19:40:53
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Semiconducting carbon nanotubes in photovoltaic blends: The case of pTB7:PC <sub/>60</sub> BM:(6,5) SWNT
摘要： Blends of carbon nanotubes with conjugated polymer and fullerene derivatives are complex nanocomposite systems, which have recently attracted great research interest for their photovoltaic ability. Therefore, gaining a better understanding of the excitonic dynamics in such materials can be important to boost the efficiency of excitonic solar cells. Here, we studied the photophysics of a ternary system in which the polymer PTB7 and the fullerene derivative PCBM are integrated with (6,5) single walled carbon nanotubes. We highlight the contribution of SWNTs in the exciton dissociation and in the charge transfer process. These findings can be useful for the exploitation of these multi-component systems for organic photovoltaic and, in general, optoelectronic applications.
关键词： excitonic dynamics,PCBM,photovoltaic blends,PTB7,SWNTs,carbon nanotubes
更新于2025-10-22 19:40:53
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Bandgap engineering of cobalt-doped bismuth ferrite nanoparticles for photovoltaic applications
摘要： The bandgap energy range of multiferroic bismuth ferrite is 2.2–2.7 eV, making it a promising candidate for photovoltaic (PV) applications. But its ef?ciency is still very low (<2%). This report thus focusses on the application of bismuth ferrite (BFO) engineered with cobalt (Co) doping and on the tuning of its bandgap energy (Eg). BiFeO3 is a unique multiferroic material that simultaneously displays both ferromagnetic and ferroelectric properties at room temperature. Co doped with pure BiFeO3 (BiFe(1?x)Cox O3; x = 0, 0.05, 0.1 and 0.15) was synthesized by the sol–gel method and annealed at 600?C. X-ray diffraction shows the well-arranged crystalline structure and peaks of pure and doped-BiFeO3 nanoparticles. A suitable reduction of Eg has been observed for Co-doped BiFeO3, which may be appropriate for the effective use in PV solar cells. Thermogravimetric analysis and differential scanning calorimetry were used to investigate the thermal decomposition character of the xerogel powder and the pattern of pure and doped BiFeO3 phases. Field emission scanning electron microscopy images show the surface crystallography of pure and Co-doped BiFeO3. Co-doped BiFeO3 has considerably reduced the crystallite and particle size of the samples. We have calculated the Eg of pure and doped BiFeO3 using a UV–Vis–NIR spectrophotometer and the results show the important reduction of Eg (1.60 eV) of the Co-doped samples, which may have potential applications in PV solar cells.
关键词： sol–gel,photovoltaic cells,Bandgap,nanoparticles,multiferroic
更新于2025-10-22 19:40:53
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[Lecture Notes in Networks and Systems] Renewable Energy for Smart and Sustainable Cities Volume 62 (Artificial Intelligence in Renewable Energetic Systems) || Prediction PV Power Based on Artificial Neural Networks
摘要： The goal of this contribution is to estimate the power delivered by a multicrystals solar photovoltaic module based on artificial neural networks. Two structures of ANNs were tested: multiple-layer perceptron and radial basic function. The results obtained gave good coefficients of correlation, the statistical R2-value obtained is about 0.96 to predict this important parameter.
关键词： Artificial neural network (ANNs),Multiple-layer perceptron (MLP),Radial basic function (RBF),Photovoltaic (PV) power
更新于2025-09-23 15:23:52
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The bright side of PV production in snow-covered mountains
摘要： Our work explores the prospect of bringing the temporal production profile of solar photovoltaics (PV) into better correlation with typical electricity consumption patterns in the midlatitudes. To do so, we quantify the potential of three choices for PV installations that increase production during the winter months when electricity is most needed. These are placements that favor (i) high winter irradiance, (ii) high ground-reflected radiation, and (iii) steeper-than-usual panel tilt angles. In addition to spatial estimates of the production potential, we compare the performance of different PV placement scenarios in urban and mountain environments for the country of Switzerland. The results show that the energy deficit in a future fully renewable production from wind power, hydropower, and geothermal power could be significantly reduced when solar PV is installed at high elevations. Because the temporal production patterns match the typical demand more closely than the production in urban environments, electricity production could be shifted from summer to winter without reducing the annual total production. Such mountain installations require significantly less surface area and, combined with steeper panel tilt angles, up to 50% of the winter deficit in electricity production can be mediated.
关键词： panel tilt,seasonal energy gap,renewable energy,photovoltaic,surface reflectance
更新于2025-09-23 15:23:52
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[IEEE 2018 International Conference on Power, Energy, Control and Transmission Systems (ICPECTS) - Chennai (2018.2.22-2018.2.23)] 2018 International Conference on Power, Energy, Control and Transmission Systems (ICPECTS) - Design and Hardware Implementation of Self Lift Negative Output Luo Converter Using MPPT for PV Applications
摘要： The design and analysis of self lift N/O luo converter is discussed in this paper. The incremental conductance mppt extracts the maximum power from PV panel and transfers to the load. The PV panel is designed by using equivalent circuit of PV cell. The output obtained from the solar panel contains more ripples. The ripples will produce more fluctuations. By using self lift negative output luo converter the unregulated output will be conveted into regulated voltage and stepped up to the higher voltage. For obtaining simulation results Matlab software is used.
关键词： Incremental conductance (IncCond) Maximum Power Point Tracking (MPPT) algorithm,self lift negative output luo converter,Photovoltaic system
更新于2025-09-23 15:23:52