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Hydrothermal processed heterogeneous MoS2 assisted charge transport in dye sensitized solar cells
摘要： Photovoltaic performance in dye sensitized solar cells (DSSCs) was improved by incorporating hydrothermal processed molybdenum disulfide (MoS2) into the bulk of titanium dioxide (TiO2) nanoparticle film. MoS2 exhibits a heterogeneous morphology comprising randomly distributed clustered nanoparticles and one dimensional nano-needles. The heterogeneous MoS2 was examined by X-ray photoelectron spectroscopy to study Mo 3d and S 2p peaks. Transmission electron microscopic studies on the heterogeneous MoS2 assert the presence of multilayers which further confirmed by UV–visible optical absorption spectroscopy showed absence of band-edge excitonic peaks at 612 nm and 674 nm. DSSCs show 17% enhancement in performance for 0.09 wt% of heterogeneous MoS2 incorporated TiO2 nanoparticle film compared to reference DSSC fabricated using only TiO2. Further changes in performance was examined by varying the concentration of MoS2 in TiO2 and observed that there is an optimum value to facilitate photo-generated charge transport kinetics in TiO2. The heterogeneous nature of MoS2 effectively acquired photo-electrons from TiO2 due to the presence of conduction band edge few meV below than that of in TiO2 and helps improving the performance.
关键词： TiO2,MoS2,Charge transport,Hydrothermal processing,Dye sensitized solar cells
更新于2025-09-12 10:27:22
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A Novel Way for Improving the Overall Photoelectric Conversion Efficiency of Dye Sensitized TiO 2 Solar Cells
摘要： The past several years has witnessed a sharp increase in the number of scientists and researchers who have attached great importance to studying Dye sensitized solar cells (DSSCs) because of its low cost and potential high photoelectric conversion efficiency. There are two main factors that influence the photoelectric conversion efficiency of dye sensitized solar cells. One is the low photon absorption rate of solar cells, and other one is the low transmission rate of the photo-generated electrons through the thick nanocrystalline film. So in order to further research and improve efficiency, an accurate model using COMSOL Multiphysics is investigated to reveal the photoresponse and current transport processes of DSSC. Specifically, an optical model is studied to determine how much the solar energy each cell takes in, and an electrical model is investigated to determine how much the overall efficiency. Besides, three adjusted micro/nanostructures of DSSCs have been built for improving the efficiency. The study shows that a more suitable structure can collect more solar energy and improve the electronic diffusion efficiency so as to improve the overall photoelectric conversion efficiency of DSSC.
关键词： Dye sensitized solar cells (DSSCs),COMSOL Multiphysics,Photoelectric coupling simulation,Micro/nanostructure
更新于2025-09-12 10:27:22
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Controllable synthesize core-shelled Zn0.76Co0.24S nanospheres as the counter-electrode in dye-sensitized solar cells and its enhanced electrocatalytic performance
摘要： The core-shelled structure nanomaterial is a potential kind of progressive catalysts for the transformation of energy due to their superior catalytic properties, large specific surface, and expedited velocity of electron transport. Meanwhile, the transition metal chalcogenides with complex nanostructures have been considered potential substitutes for highly active and scarce noble metal because of the remarkable electrical and photic catalytic activity. In this study, the Zn0.76Co0.24S nanospheres with different nanostructures were obtained by varying the solvothermal treatment durations. The measurement results exhibited that the as-prepared Zn0.76Co0.24S nanospheres possessed a large surface area (135.7 m2 g?1), better average pore size distribution (9.2 nm), and the excellent conductivity (Rct = 0.24 Ω). Specifically, the photocurrent density versus voltage (J–V) curves demonstrated that a 7.42% power conversion efficiency (PCE) was achieved for the dye-sensitized solar cells (DSSCs) employing Zn0.76Co0.24S as the counter-electrode under a simulated solar light, which is evidently superior to the value of Pt (7.07% PCE) and the value of ZnCo2O4 (4.60% PCE).
关键词： electrocatalytic performance,Zn0.76Co0.24S nanospheres,core-shelled structure,dye-sensitized solar cells
更新于2025-09-12 10:27:22
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WN/nitrogen-doped reduced graphite oxide hybrids for triiodide reduction in dye-sensitized solar cells
摘要： The development of low-cost, environmental friendliness, outstanding catalytic activity, superior conductivity and good stability counter electrode (CE) catalyst in dye-sensitized solar cells (DSSCs) is important to promote the commercial application of DSSCs. Here, WN/nitrogen-doped reduced graphite oxide hybrids (WN/NrGO) had been synthesized by hydrothermal method followed by nitridation treatment, which used as CE catalysts for catalyzing I3? to I?. The combined WN and nitrogen-doped reduced graphite oxide (NrGO) into WN/NrGO could effectively regulate the catalytic activity for the reduction of I3?, accelerate the charge transfer at the interface, and then the synergistic effect between of them can be fully achieved. When the WN/NrGO served as the CE catalyst in DSSCs, the photoelectric conversion efficiency (PCE) of 7.42% has been obtained, compared to the conventional Pt-based DSSCs (7.71%). Meanwhile, as-prepared WN/NrGO exhibited higher PCE than that of the solo WN (6.19%) and NrGO (5.81%) in parallel. A series of electrochemical measures revealed that the WN/NrGO displayed the higher catalytic activity and charge transfer ability than that of the solo WN and NrGO, so the synthesized low-cost WN/NrGO have an potential to be used as the effectively CE catalysts for the replacement of the noble Pt.
关键词： Dye-sensitized solar cells,Triiodide reduction,Counter electrode,WN/nitrogen-doped reduced graphite oxide
更新于2025-09-12 10:27:22
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MoC/MnO composite materials as high efficient and stable counter electrode catalysts for dye-sensitized solar cells
摘要： MoC/MnO composite materials have been easily synthesized via a two-step hydrothermal and one-step carbonization method and used as counter electrode catalysts in DSSCs for the first time. The as-prepared samples were characterized by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM) and transmission electron microscopy (TEM). And their electrocatalytic properties were also thoroughly studied by electrochemical impedance spectroscopy (EIS), Tafel polarization and so on. It is found that the electrocatalytic properties of the MoC/MnO CEs can be greatly enhanced. After optimizing the molar ratio of MoO3 precursor and KMnO4, the as-obtained MoC/MnO-0.25 CE has superior electrocatalytic ability, low charge transfer resistance and high incident photon-to-current conversion efficiency (IPCE). And the power conversion efficiency of the DSSC based on the MoC/MnO-0.25 CE is up to 8.00%, better than that of the DSSC used standard Pt CE (7.36%) in the same test environment, meanwhile the MoC/MnO-0.25 CE also has good electrochemical stability in the iodine-based electrolyte, which shows a promising candidate to replace Pt for DSSCs.
关键词： MoC/MnO composite materials,carbonization method,hydrothermal method,counter electrode catalysts,dye-sensitized solar cells
更新于2025-09-12 10:27:22
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Polymeric Electrolyte Thin Film for Dye Sensitized Solar Cells Application
摘要： In this paper, the possibility of replacing liquid electrolyte in a dye sensitized solar cells with a thin film of conductive polymer material was investigated. Liquid electrolyte in the construction of dye sensitized solar cells leaks and evaporates and leads to corrosion of the electrode, which affects negatively on the conversion efficiency of solar radiation to electricity. The research focuses on the doping of the PVDF-HFP polymer by potassium iodide to improve its electrical conductivity and the development of thin film deposition technology for use in solar cells. Using a scanning electron microscope, with the increase of potassium iodide, changes in the surface morphology of PVDF-HFP were measured. Using a Keithley meter, it was investigated that an increased content of potassium iodide led to a reduction in resistance. The electrical conductivity of the tested samples was calculated. In order to test the suitability of developed materials for application in the construction of photovoltaic cells, a series of dye-sensitized solar cells ITO/TiO2/dye/active layer/Al were prepared. The active layer is made from pure PVDF-HFP and doped with potassium iodide. As a reference solar cell, a standard dye sensitized solar cell with a liquid electrolyte and a counter electrode was also prepared.
关键词： PVDF-HFP,Dye sensitized solar cells,Polyelectrolyte
更新于2025-09-12 10:27:22
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An electron donating controlling strategy for design several dithieno[3,2-b:2′,3′-d]pyrrole based dyes with D–D–A structure in dye-sensitized solar cells
摘要： One of the important strategies for designing pure organic dyes is to improve the electron donating abilities of dye donors hence increase the intramolecular potential energy difference. In order to quantify the electron-donating capacity of organic units, we firstly propose a parameter donation ability (DA) value for evaluating the electron DA of organic units via theoretical calculation, by using of several fragments such as coplanar dithiophenyl pyrrole, triphenylamine (TPA), phenothiazine (PTZ) and cyanoacetic acid (CA) which is the research objects here. Inspired by the DA values of the above organic fragments, dye PSD-9, PSA-10 and PST-11 were designed and synthesized. Cyclic voltammetric (CV) measurements show that the DA values of dye PSA-10 and PST-11’s donor increases when TPA and PTZ groups are introduced into PSD-9, hence HOMO level increases and the band-gap narrow down. This change is reflected in the absorption spectra: the maximum absorption wavelength of PSA-10 and PST-11 is 63 and 84 nm red-shifted compared with PSD-9. Similarly, the molar extinction coefficients of PSA-10 and PST-11 are increased by 34.7 × 103 and 14.7 × 103 M?1 cm?1, respectively. Combining a mesoporous titania film grafted by these dithiophenyl pyrrole dye with iodine electrolyte, an 4.2% and 4.8% power conversion effciency (PCE) is achieved for PSA-10 and PST-11 at an irradiance of the AM1.5G sunlight, with an significant increasing compared to PSD-9 with an PCE of 1.6%. The typical photocurrent density–voltage (J–V) test shows that the short circuit current of dye PSA-10 and PST-11 is much higher than that of PSD-9, which is the main reason for the improvement of PCE. The red-shift and stronger IPCE curve is the most advantageous evidence of the change of short circuit current. Furthermore, electrochemical impedance measurements is studied for exploring the changes of open-circuit voltage of PSA-10 and PST-11, the results infer that larger donor units and long alkyl chains can effectively increasing current density on photoanode, hence increase the open circuit voltage of the devices.
关键词： electron donating ability,dithieno[3,2-b:2′,3′-d]pyrrole,dye-sensitized solar cells,organic dyes,power conversion efficiency
更新于2025-09-12 10:27:22
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Charge transfer improvement of ZnO-based dye-sensitized solar cells modified with graphite nanosheets and bilayer photoelectrode structures
摘要： In this work, dye-sensitized solar cells (DSSCs) were fabricated with different photoelectrode structures consisting of a ZnO-based photoelectrode, a ZnO/Au Schottky barrier-based photoelectrode, graphite nanosheets loaded on a ZnO (GZnO)-based photoelectrode, graphite nanosheets loaded on a ZnO nanoparticles (GZnO NPs)-based photoelectrode and graphite nanosheets loaded on a ZnO nanoparticles/ZnO (GZnO NPs/ZnO) as a bilayer-based photoelectrode. The photovoltaic characteristics of DSSCs were investigated based on: the power conversion efficiency (PCE), short-circuit current density (Jsc), open-circuit voltage and fill factor. The kinetics electron transport of impedance spectros- DSSCs was carried out using electrochemical copy (EIS). The semi-circle in the Nyquist plot was calculated to rep- resent the charge transfer resistance (Rct). It was found that the GZnO NPs/ZnO bilayer-based photoelectrode exhibited the max- imum Jsc (9.185 mA/cm2) and maximum PCE (2.37%), which resulted by the minimum Rct in the device. The result can be interpreted as showing that a graphite nanosheet structure improves the electron transport property which produces an excellent charge transfer mechanism in the photoelectrode. Accordingly, enhanced perform- ance of ZnO-based dye-sensitized solar cells with graphite nano- sheets loaded on a ZnO nanoparticles layer could be simply explained in terms of the charge transfer mechanism.
关键词： graphite nanosheets,ZnO,dye-sensitized solar cells,charge transport
更新于2025-09-12 10:27:22
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Unsymmetrically pyrazole-3-carboxylic acid substituted phthalocyanine-based photoanodes for use in water splitting photoelectrochemical and dye-sensitized solar cells
摘要： A new photosensitizer, PCA-ZnPc-2, was synthesized through the asymmetric functionalization of phthalocyanine ring with a pyrazole-3-carboxylic acid as the electron-withdrawing and anchoring group and six hexylsulfanyl as the bulky electron-donating groups. PCA-ZnPc-2 was tested in dye-sensitized solar cells (DSSCs) and its performance was compared with PCA-ZnPc-1. It was found that PCA-ZnPc-2 has higher electron-donating ability which is favorable for light harvesting and suppress the dye aggregation on TiO2 when compared to PCA-ZnPc-1. Also, the new photosensitizer was used in dye-sensitized photoelectrochemical cells for hydrogen production under visible irradiation. The results show that PCA-ZnPc-2 is a promising photosensitizer to harvest the red/near-IR regions.
关键词： Dye-sensitized solar cells,Photoelectrochemical hydrogen production,Pyrazole-3-carboxylic acid,Phthalocyanine
更新于2025-09-12 10:27:22
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Interfacial Engineering in Functional Materials for Dye‐Sensitized Solar Cells || Carbon Nanotubes‐Based Nanocomposite as Photoanode
摘要： Over the past few decades, energy is the backbone of technology and economic development. In addition to man, machine, and money, energy is now fourth factor of production. Without energy, no machine will run, electricity is needed for everything. Hence, our energy requirements have increased dramatically in the years following the industrial revolution. Readily accessible fossil fuels, such as coal, natural gas, and oils, are the major energy sources used to meet our current need. However, these sources are nonrenewable and have led to serious environmental issues, global warming, and air pollution, and their increasing consumption rate has accelerated fossil fuel depletion; the search for alternative energy source has become vital.
关键词： Dye-Sensitized Solar Cells,Photoanode,Renewable Energy,Nanocomposite,Carbon Nanotubes
更新于2025-09-12 10:27:22