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Dye-sensitized solar cells based on TiO2 nanoparticles-decorated ZnO nanorod arrays for enhanced photovoltaic performance
摘要： Herein, we report a successful approach for the vertically aligned ZnO nanorod arrays (ZNAs) deposited on fluorine-doped tin oxide (FTO) substrate by hydrothermal process. TiO2 nanoparticles were grown on the ZNAs by dip-coating. ZNAs and TiO2 nanoparticles (TNPs)-decorated ZNAs (TNPs@ZNAs) were used as a photoanode in dye-sensitized solar cells. The influence of bath temperature for the attainment of uniform decoration of TiO2 nanoparticles onto ZnO nanorod arrays and the photovoltaic performances of the assembled dye-sensitized solar cells were studied. The power conversion efficiency (PCE) of the TNPs@ZNAs arrays prepared at a bath temperature of 120 °C can reach 4.47%, representing better improvement when compared with ZNAs photoanode (3.15%).
关键词： Nanorod arrays,Bath temperature,Dye-sensitized solar cells,TiO2 decorated ZnO
更新于2025-09-23 15:19:57
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Thickness-dependent hole-blocking capability of RF-sputtered nickel oxide compact layers in dye-sensitized solar cells
摘要： Photo-generated charge carrier recombination in dye-sensitized solar cells (DSSCs) is observed to be suppressed significantly at the interface between transparent fluorine-doped tin oxide (FTO) and titanium dioxide (TiO2) by coating nickel oxide (NiO) thin film by RF sputtering. UV-Visible optical absorption spectroscopic measurements performed in the wavelength window of 300–800 nm showed ~ 60% average transmittance for NiO thin films coated for 10 min. The calculated optical bandgap value for NiO was 3.4 eV. The RF-sputtered NiO films were thoroughly characterized by X-ray photo-electron spectroscopy to examine Ni 2p3/2 and Ni 2p1/2 along with O 1s. The present study assessed the effect of 5, 10, and 15 min RF-sputtered NiO thin films at the interface between FTO and mesoporous TiO2. Results showed that charge transport in DSSCs is highly sensitive to NiO thickness at the interface between FTO and TiO2. It was specifically noticed that 10 min coating of NiO on FTO yielded DSSCs with photo-conversion efficiency (η) of ~ 6.8% while DSSCs with no NiO on FTO showed only 4.9%. Further increase in NiO thickness affected the performance of DSSCs due to the significant reduction in tunneling probability from TiO2 to FTO.
关键词： Interfaces,Recombination,Nickel oxide,Charge transport,Dye-sensitized solar cells
更新于2025-09-23 15:19:57
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Effective Fixation of Carbon in ga??C <sub/>3</sub> N <sub/>4</sub> Enabled by Mga??Induced Selective Reconstruction
摘要： The methodology of metal-involved preparation for carbon materials is favored by researchers and has attracted tremendous attention. Decoupling this process and the underlying mechanism in detail are highly required. Herein, the intrinsic mechanism of carbon fixation in graphitic carbon nitride (g-C3N4) via the magnesium-involved carbonization process is reported and clarified. Magnesium can induce the displacement reaction with the small carbon nitride molecule generated by the pyrolysis of g-C3N4, thus efficiently fixing the carbon onto the in situ template of Mg3N2 product to avoid the direct volatilization. As a result, the N-doped carbon nanosheet frameworks with interconnected porous structure and suitable N content are constructed by reconstruction of carbon and nitrogen species, which exhibit a comparable photoelectric conversion efficiency (8.59%) and electrocatalytic performances to that of Pt (8.40%) for dye-sensitized solar cells.
关键词： magnesium inducement,reconstruction mechanism,dye-sensitized solar cells,graphitic carbon nitride (g-C3N4),tri-iodide reduction
更新于2025-09-23 15:19:57
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A novel PEDOT:PSS/SWCNH bilayer thin film counter electrode for efficient dye-sensitized solar cells
摘要： Thin platinum deposited over fluorine-doped tin oxide glass substrate is a well-known and widely used counter electrode for efficient dye-sensitized solar cells. In this paper, we investigated a potential and Pt-free bilayer thin film counter electrode based on single wall carbon nanohorn over PEDOT:PSS film. The bilayer thin film counter electrode was developed using a simple spin coat process. The results of atomic force microscope and scanning electron microscope unveil the uniform distribution of single wall carbon nanohorns over PEDOT:PSS with average size of 76 nm. The extensive electrochemical analysis demonstrated superior electrocatalytic behavior for bilayer counter electrode with lower peak-to-peak separation potential of 0.6 V, lower Rs and RCT values of 25.9 Ω and 399 Ω, and higher Jo value of 2.4 mA cm?2. The fabricated DSSC using bilayer counter electrode witnessed higher power conversion efficiency of 5.1%, compared to PEDOT:PSS (3.87%) and SWCNH (1.88%), and is almost equivalent to the platinum-based counter electrode (5.53%). The present study of bilayer counter electrode has great potential in terms of low-cost and non-platinum counter electrode for dye-sensitized solar cell applications.
关键词： Counter electrode,PEDOT:PSS,Single wall carbon nanohorn,Bilayer thin film,Dye-sensitized solar cells
更新于2025-09-23 15:19:57
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Electrodeposition of hierarchical zinc oxide nanostructures on metal meshes as photoanodes for flexible dye-sensitized solar cells
摘要： Hierarchical zinc oxide (ZnO) nanorod arrays (ZNRAs) were fabricated on stainless steel meshes via a two-step electrodeposition approach as flexible dye-sensitized solar cells (DSSCs) photoanodes. The two-step electrodeposition was realized by deposition of primary ZNRAs followed by growth of secondary branched ZnO nanorods on the primary ZnO nanorods surfaces. The morphologies of ZNRAs and the photovoltaic performances of the assembled DSSCs with different deposition conditions of primary ZNRAs were compared in detail. After modulating electrodeposition conditions, the DSSC assembled with hierarchical ZNRAs obtained an optimum photovoltaic performance with power conversion efficiency of 1.81 %.
关键词： Electrodeposition,Zinc oxide,Stainless steel mesh,Dye-sensitized solar cells,Flexible photovoltaic devices
更新于2025-09-23 15:19:57
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Influence of the meso-substituents of zinc porphyrins in dye-sensitized solar cell efficiency with improved performance under short periods of white light illumination
摘要： The sensitization activity of four zinc metalloporphyrin dyes: meso-tetrakis(4-pyridyl)porphyrinato Zn(II) (a), meso-triphenyl-(4-carboxyphenyl)porphyrinato Zn(II) (b), meso-tetrakis(4-carboxyphenyl)porphyrinato Zn(II) (c) and meso-tripyridyl(4-carboxyphenyl)porphyrinato Zn(II) (d) is reported here, in terms of current-potential curve, open-circuit potential, fill factor, and overall solar energy conversion efficiency which have been evaluated under 100 mW/cm2 light intensity and their performances compared to the benchmark N719 (di-tetrabutylammonium cis-bis(isothiocyanato)bis(2,2′-bipyridyl-4,4′-dicarboxylato) ruthenium(II). This work focus the structural aspects of dyes with anchoring groups using TiO2-based Dye Sensitized Solar Cells (DSSCs), which includes pyridyl and carboxyphenyl acid groups and argue how the combination of both anchoring groups, in the same structure, may allow relevant optimization of DSSCs performance in the near future. Also, a noticeable improvement in the photovoltaic performance of all dyes, reaching a maximum increase from 25% to 69% in the overall DSSC efficiency under short periods of white light illumination is discussed.
关键词： Dye sensitized solar cells (DSSCs),Macrocycles,Carboxylic acid anchoring group,Dyes,Photoconversion efficiency,TiO2,Metalloporphyrin
更新于2025-09-23 15:19:57
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Hybrid of Graphene based on quaternary Cu2ZnNiSe4 a??WO3 Nanorods for Counter Electrode in Dye-sensitized Solar Cell Application
摘要： A novel nanohybrid of graphene-based Cu2ZnniSe4 with WO3 nanorods (G-CZNS@W) was successfully synthesized via a simple hydrothermal method to use as a counter electrode (ce) for dye-sensitized solar cells (DSSCs). The characterization technique confirmed the structural and morphologies of the G-CZNS@W nanohybrid, which could show rapid electrons transfer pathway through the WO3 nanorods. Moreover, the as-fabricated G-CZNS@W nanohybrid exhibited synergetic effect between G-cZnS and a Wo3 nanorod, which could affect the electrocatalytic activity towards triiodide reaction. The nanohybrid exhibits an excellent photovoltaic performance of 12.16%, which is higher than that of the standard pt electrode under the same conditions. the G-cZnS@W nanohybrid material as ce thus offers a promising low-cost Pt-free counter electrode for DSSC.
关键词： Counter Electrode,Graphene,WO3 nanorods,Dye-sensitized Solar Cells,Cu2ZnniSe4
更新于2025-09-23 15:19:57
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One-step electrodeposited CoSe2 nano-reticular with high electroconductivity and electrocatalytic as a counter electrode for dye sensitized solar cell
摘要： Herein, a nano-reticular structure cobalt diselenide (CoSe2) film with high electroconductivity and electrocatalytic has been synthesized by one-step electrodeposition method and is applied as a counter electrode for dye sensitized solar cell (DSSC). Cyclic voltammetry (CV) measurements with different potential windows are carried out to reveal the deposition mechanism of cobalt selenide, illustrating that the formation of CoSe2 occurred at ?0.62 V via inductive effect reaction with selenide (Se2?). Tafel and CV characterizations demonstrate an excellent electrocatalytic activity of CoSe2 counter electrode towards I?/I3? reduction reaction, which is attributed to the electronic effect between Co and Se and electrochemical active sites, provided by wrinkled layer structure, for adsorption and reduction of I3?. EIS measurements show a great electroconductivity ability of electrodeposition CoSe2 film. The DSSC based on the CoSe2 counter electrode yields a maximum power conversion efficiency of 3.96% (Jsc = 10.84 mA cm?2, Voc = 0.65 V and FF = 55%) under the standard AM 1.5G illumination, which is 1.6 times higher than that of commercial Pt-based DSSC.
关键词： Electrocatalytic,Dye-sensitized solar cells,Electrodeposition,Cobalt diselenide
更新于2025-09-23 15:19:57
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Balance between the explored Pt counter electrode in an electrolyte medium and the photoanode for highly efficient liquid-junction photovoltaic devices
摘要： This work investigates the effect of the ratio of the explored Pt area in the electrolyte medium and the photoanode area (REP) on the performance of dye-sensitized solar cells (DSCs). As a result, the power conversion efficiency of DSCs increases by the ascending REP. The highest power conversion efficiency, which was obtained for the cell with the REP of 64/49, was 8.40%. Furthermore, the relationship between efficiency and fabrication cost is carefully discussed in terms of reducing or enhancing the surface area of CE compared to the photoanode’s surface area. The findings in this work may propose a way for a further development of efficient and large-scale DSCs in the future.
关键词： explored Pt area,photoanode,counter electrode,Dye-sensitized solar cells
更新于2025-09-23 15:19:57
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Modification of Graphene based on Ba2Cu8Ni2Se12 Catalyst with CoS Nanosphere for Counter Electrode for Dye-sensitized solar cell
摘要： A novel Graphene-Ba2Cu8Ni2Se12 with CoS Nanosphere (GBC) was synthesized via a facile hydrothermal method for use as a Counter electrode (CE) in Dye-sensitized solar cells (DSSCs). In this work, the Ba2Cu8Ni2Se12 (BCNS) and CoS nanosphere were directly grown on graphene sheets with strong interaction. The morphology, electrochemical and photovoltaic performances of GBC were studied. The GBC CE in bifacial DSSCs showed higher power conversion efficiency (12.37%), which is comparable to the traditional Pt electrode (4.07%). This value noticeably that the synergetic effect of the GBC structure provides a large catalytic active area and excellent of electron transfer partway. The GBC CE exhibiting good device performance, which can serve as low-cost CE than Pt for the DSSC application.
关键词： CoS Nanosphere,Counter electrode,Graphene,Dye-sensitized solar cells,Ba2Cu8Ni2Se12
更新于2025-09-23 15:19:57