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oe1(光电查) - 科学论文

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出版时间
  • 2019
研究主题
  • Dye-sensitized solar cell
  • Photoelectrode
  • Light scattering layer
  • Transmittance
  • White pigment (R902+)
  • Rutile titanium dioxide
应用领域
  • Optoelectronic Information Materials and Devices
机构单位
  • Tribhuvan University
352 条数据
?? 中文（中国） ▾

  • Ruthenium (Ru) doped Titanium Dioxide (P25) Electrode for Dye Sensitized Solar Cells

    摘要： In this study, P25-titanium dioxide (TiO2) was doped with ruthenium (Ru) by systematically varying the Ru content at 0.15, 0.30, 0.45 and 0.6 mol%. The synthesized Ru-doped TiO2 nanomaterials have been characterized by X-ray diffraction (XRD), Raman spectroscopy, energy-dispersive X-ray (EDX) analysis, UV-visible (UV–Vis) spectroscopy, and electrochemical impedance (EIS) spectroscopy. The XRD patterns of undoped and Ru-doped TiO2 nanomaterials confirm the presence of mixed anatase and rutile phases of TiO2 while EDX spectrum confirms the presence of Ti, O and Ru. Further, UV-visible absorption spectra of doped TiO2 nanomaterial reveal a slight red shift on Ru-doping. The short circuit current density (JSC) of the cells fabricated using the Ru-doped TiO2 photoanode was found to be dependent on the amount of Ru present in TiO2. Optimized cells with 0.3 mol% Ru-doped TiO2 electrodes showed efficiency which is 20% more than the efficiency of the control cell (η = 5.8%) under stimulated illumination (100 mWcm?2, 1 sun) with AM 1.5 filter. The increase in JSC resulted from the reduced rate of recombination upon doping of Ru and this was confirmed by EIS analysis.

    关键词： Ru-doped TiO2,P25-TiO2,dye sensitized solar cells

    更新于2025-09-23 15:19:57

  • Functionalized metal oxide nanoparticles for efficient dye-sensitized solar cells (DSSCs): A review

    摘要： Dye-sensitized solar cells (DSSCs) are a next-generation photovoltaic energy conversion technology due to their low cost, ability to fabrication on various substrates, structural modifications, excellent transparency, photovoltaic output and its potential applications in wearable devices, energy sustainable buildings, solar-powered windows, etc. DSSC working devices consist of components such as conductive oxide substrates, photoanodes with wide bandgap semiconductors, dye molecules (sensitizers), counter electrodes and redox electrolytes, etc. High-efficiency DSSC devices can be fabricated suitable functionalization of semiconducting metal oxides with quantum dots, organic conjugated polymers, etc. In this review, we discuss different photovoltaic technologies, working principles of DSSCs, fabrication process of devices using various novel inorganic nanostructured materials, influencing parameters on the performance of DSC-device such as photoconversion efficiency (PCE), short circuit current (Jsc), open-circuit voltage (Voc) and fill factor (FF).

    关键词： Photovoltaics,Quantum dots,Sensitizers,DSSC-device parameters,Dye-sensitized solar cells (DSSCs),Semiconducting metal oxides

    更新于2025-09-23 15:19:57

  • Short-term light soaking effect on dye-sensitized solar cells

    摘要： Dye-sensitized solar cells (DSSCs) are one of the most promising third generation solar cells and have been regarded as a competitive alternative to the conventional silicon-based photovoltaic devices due to their relatively low production cost. Light soaking effect is an intriguing phenomenon that exists in DSSCs, which refers to the enhancement of the electrical parameters in the cells after being exposed to light soaking. In this paper, we report on the variation in the electrical parameters of DSSCs under continuous exposure to a simulated solar irradiation for a period up to 6h. Increments of Jsc and Voc in DSSC were observed after 6h of light soaking, which led to improved efficiency from 3.87% to 4.50%. The improvements may be ascribed to the formation of electron trapping states below the TiO2 conduction band edge, which facilitated the charge carrier transport.

    关键词： electrical parameters,TiO2 conduction band,Dye-sensitized solar cells,efficiency,light soaking effect

    更新于2025-09-23 15:19:57

  • Modification of reduced graphene oxide layers by electron-withdrawing/donating units on molecular dopants: Facile metal-free counter electrode electrocatalysts for dye-sensitized solar cells

    摘要： Small molecules of aniline (AN) and nitrobenzene (NB) doped on reduced graphene oxide nanosheets (rGO) represent the attractive Pt-free and earth abundant counter electrodes (CEs) in dye-sensitized solar cells (DSSCs). Scanning electron microscope and transmission electron microscope confirm a very thin layer structure with wrinkled and folded nanosheets. The binding between AN or NB and rGO is confirmed by Fourier-transform infrared spectroscopy (FTIR), Raman spectroscopy, and X-ray photoelectron spectroscopy (XPS). In this work, two different redox electrolytes are investigated: I?/I3? and [Co(bpy)3]3+/2+. Compared to rGO electrode-based DSSCs, the AN-rGO (1:10) and NB-rGO (1:10) electrode-based DSSCs applying I?/I3? and [Co(bpy)3]3+/2+ electrolytes show 40–50% and 30–35% increase in power conversion efficiency, respectively. Furthermore, both AN-rGO (1:10) and NB-rGO (1:10) perform stably upon electrochemical continuous test. Such excellent photoelectric performance correlates with the induced charge transfer between reduced graphene oxide and the molecules which effectively promotes the reduction and regeneration of I?/I3? and [Co(bpy)3]3+/2+ ions.

    关键词： Electrocatalyst,Dye-sensitized solar cell,Molecular dopant,Reduced graphene oxide,Counter electrode

    更新于2025-09-23 15:19:57

  • Construction of Pt-free electrocatalysts based on hierarchical CoS2/N-doped C@Co-WS2 yolk-shell nano-polyhedrons for dye-sensitized solar cells

    摘要： Nanomaterials with yolk-shell structures are identified as promising advanced catalysts in energy conversion devices due to their larger surface area, more efficient active sites, and shorter charge transfer paths. In this work, we developed a facile template method to synthesize yolk-shell structured CoS2/N-doped C@Co-WS2 (CoS2/NC@Co-WS2) as counter electrode material in dye-sensitized solar cells. In detail, zeolitic imidazolate framework-67 (ZIF-67) as a template reacted with (NH4)2WS4 through an anion conversion/exchange processes, which was followed by the subsequent sulfuration reaction. Additionally, the influence of mass ratio between reactions on the morphologies and electrochemical properties of catalysts were further explored. When the mass ratio of the ZIF-67 precursors and (NH4)2WS4 is 5/1, CoS2/NC@Co-WS2 delivered a superior power conversion efficiency of 9.21% for Pt-free dye-sensitized solar cells which was much higher than that of Pt (8.18%). This result could be attributed to the coordination of multiple elements, prominent yolk-shell structure, and the largest surface area (110 m2 g?1).

    关键词： Nano-polyhedrons,CoS2/NC@Co-WS2,Counter electrodes,Catalytic activities,Dye-sensitized solar cells

    更新于2025-09-23 15:19:57

  • Highly efficient bio-based porous carbon hybridized with tungsten carbide as counter electrode for dye-sensitized solar cell

    摘要： Bio-based porous carbon (CMA and CTA) are successfully prepared from waste carton via microwave-assisted activation (MA) and two-step chemical activation (TA) methods, respectively. The as-prepared CTA sample exhibits higher specific surface area (824.16 m2 g?1) and larger total pore volume (0.71 cm3 g?1), as compared with those of the CMA sample (655.36 m2 g?1 and 0.62 cm3 g?1, correspondingly). The higher specific surface area could provide more catalytic sites; thus, the dye-sensitized solar cell (DSSC) assembled with a CTA counter electrode (CE) deliver a power conversion efficiency (PCE) of 6.76%, surpass the CMA-based DSSC (6.19%). Further, tungsten carbide (WC) are introduced into CTA and CMA to form hybrid catalysts (WC/CTA and WC/CMA, respectively) in order to improve their catalytic activities. Benefitting from the synergistic effect of bio-based porous carbon and WC, the DSSCs with WC/CTA and WC/CMA CEs exhibit superior PCE values of 7.32% and 6.85%, respectively, close to Pt (7.51%). This work provides an effective strategy for synthesizing low-cost and high-performance hybrid catalysts from bio-based carbon to achieve resource utilization of biomass waste in new energy fields.

    关键词： Electrocatalyst,Counter electrode,Bio-based carbon,Tungsten carbide,Dye-sensitized solar cell

    更新于2025-09-23 15:19:57

  • A facile hydrothemal synthesis of MoS2@Co3S4 composites based on metal organic framework compounds as a high-efficiency liquid-state solar cell counter electrode

    摘要： A hollow Co3S4 polyhedral loads MoS2 nanosheet composite MoS2@Co3S4-0.5 is prepared by hydrothermal method using Co-based metal organic framework material ZIF-67 as precursor. Hollow Co3S4 polyhedron and uniformly distributed MoS2 nanosheet structure can not only prevent MoS2 aggregation, but also increase the specific surface area of the material and expose more catalytically active sites. The composites afford a promising synergistic effect on the catalyzing of triiodide reduction. As a counter electrode material applied to dye-sensitized solar cells, MoS2@Co3S4-0.5 exhibits excellent catalytic activity, achieving a photoelectric conversion efficiency of 7.86%, which is superior to 6.99% of Pt counter electrode performance in dye-sensitized solar cells. This indicates that MoS2@Co3S4-0.5 composite material can be used to replace precious metal Pt as an efficient and low-cost counter electrode material in dye-sensitized solar cells.

    关键词： metal-organic framework,facile hydrothemal synthesis,transition metal sulfide,dye-sensitized solar cells,counter electrode

    更新于2025-09-23 15:19:57

  • D-A-π-A based organic dyes for efficient DSSCs: A theoretical study on the role of π-spacer

    摘要： A series of novel D-A-π-A organic dyes with different π-spacers for dye-sensitized solar cells (DSSCs) are designed based on hetero-tri-arylamine donor-based dye DP2. The key parameters of all the dyes affecting short-circuit current (JSC) and open-circuit voltage (VOC) are theoretically investigated in detail using density functional theory (DFT) and time-dependent DFT (TD-DFT) calculations to reveal structure-property relationships. The theoretical results indicate that extending π-spacer is beneficial to improve light-absorbing capacities with larger responsive range of spectra and molar extinction coefficients (ε). The designed dyes DP2-1–DP2-5 exhibit a good balance in various important properties including light harvesting efficiency (LHE), electronic injection driving force (ΔGinject) and vertical dipole moment (μnormal) compared to reference dye DP2. Among all the designed dyes, DP2-3–DP2-5 containing π-spacers with branched chain exhibit obvious red shifted absorption band, smaller regeneration driving force (ΔGreg) and reorganization energy (λtotal), and larger excited state lifetime (τ) and number of photoinjected electrons (nc). This study is expected to provide new clues for the experimental synthesis of highly efficient metal-free organic dyes for DSSCs.

    关键词： Electronic structure,Organic dye,Dye-sensitized solar cells,Density functional theory

    更新于2025-09-19 17:15:36

  • Effect of Side Substituents Incorporated into <i>??</i> a??Bridges of Quinoxalinea??Based Sensitizers for Dyea??Sensitized Solar Cells

    摘要： ZW003, has been synthesized and applied in dye-sensitized solar cells (DSSCs). Both dyes have broad absorption and large molar absorption coefficients. The sensitizer with the HQ core effectively restrains intermolecular aggregation owing to steric hindrance of numerous alkyl chains. A thienyl unit with or without a hexyl branch is used as a π-bridge. Incorporation of only thienyl groups as a π-bridge into the sensitizer increases the dye-loading amount on TiO2 film owing to the smaller molecular size. Using the ZW002 dye with the Co (II/III) redox couple results in DSSCs that exhibits a high photovoltaic conversion efficiency of 8.23% and short-circuit current density (Jsc) of 12.43 mA cm?2, an open-circuit voltage (Voc) of 960 mV, and a fill factor (FF) of 0.69. Although ZW003 shows a wider absorption range than that of ZW002, the two additional phenyl groups on the quinoxaline unit contributes to poorer performance (PCE of 7.43%) due to more serious dye aggregation.

    关键词： Quinoxaline,Additional acceptors,Intermolecular aggregation,Dye-loading amount,Dye-sensitized solar cells

    更新于2025-09-19 17:13:59

  • New engineered and environmentally friendly dye‐sensitized solar cells: Efficient extraction of dyes from Cytisus, <i>Alcea rosea</i> , and Roselle

    摘要： In this study, an efficient extraction of natural dyes from three plants such as Cytisus, Alcea rosea, and Roselle was carried out by solid‐liquid extraction method. Extraction conditions were optimized using the Response Surface Methodology (RSM). Temperature, time, and solvent ratio of extractions were the variables, and absorption intensities in maximum wavelength of extracted samples were the response of experiments. Optimum extraction conditions for the Cytisus, A rosea, and Roselle flowers were at 55°C in 60 minutes, 44°C in 40 minutes, and 54°C in 32 minutes, respectively. Also, the best solvent for extraction of dyes was pure ethanol and pure water, respectively, for the Cytisus, A rosea, and Rosell. Moreover, results of the study showed that absorption intensities of the Cytisus, A rosea, and Roselle were equal to 1.182 at 400 nm, 1.532 at 540 nm, and 1.932 at 520 nm, respectively. To fabricate solar cells, anode electrode was coated by a thin layer of TiO2. The surface morphology of TiO2 film investigated by SEM and AFM showed a suitable homogeneity of TiO2 film without crack with an average particle size of 25 to 30 nm. Atomic force microscopy (AFM) images demonstrated that the average roughness of TiO2 thin film is about 205 nm, while the surface roughnesses of anodes was equal to 154, 101, and 119 nm after applying the Cytisus, Roselle, and A rosea on TiO2 film, respectively. Fabricated solar cells were characterized by photovoltaic and IPCE tests. Results represented that fabricated solar cells synthesized by extracted dye from Roselle had the best performance compared with other cells. The efficiency of this cell was equal to 0.842%, with an open‐circuit voltage (Voc) of 0.644, a short‐circuit current (Jsc) of 1.912, a fill factor (FF) of 0.683, and an incident photon‐to‐current efficiency (IPCE) of 18.943%.

    关键词： Alcea Rosea,dye‐sensitized solar cell,Response Surface Methodology,dye extraction,Cytisus,Roselle

    更新于2025-09-19 17:13:59