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Nanoscale Perovskite-Sensitized Solar Cell Revisited: Is This Dye-Cell or Perovskite-Cell?
摘要： A general and straightforward way of preparing few nanometer-sized well-separated MAPbIxBr3-x perovskite photosensitizers on the surface of ~1 μm thick mesoporous TiO2 photoanode was suggested via a two-step sequential deposition of low-concentrated lead halides (0.10 ~ 0.30 M PbI2 or PbBr2) and methylammonium iodide/bromide (MAI/MABr). When those nanoscale MAPbIxBr3-x perovskites are incorporated as a photosensitizer in typical solid state dye-sensitized solar cells (ss-DSSCs), it could be verified clearly by the capacitance analysis that nano-particulate MAPbI3 perovskites are playing the same role as that of a typical dye sensitizer (MK-2 molecule) though their size, composition and structure are different.
关键词： perovskites,Impedance analysis,solid state dye-sensitized solar cells,sensitizers,nanostructures
更新于2025-09-23 15:19:57
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Design, Molecular Modeling and Synthesis of Metal-Free Sensitizers of Thieno Pyridine Dyes as Light-Harvesting Materials with Efficiency Improvement Using Plasmonic Nanoparticles
摘要： Considering the thiophene unit as an electron-rich heterocycle, it is investigated with the aim of elucidating its potential efficiency for solar cell application. With the introduction of active substituents such as COOEt, CONH2 and CN into the thiophene segment, three novel thieno pyridine sensitizers (6a–c), based on donor-acceptor D-π-A construction, are designed and synthesized. The effect of the anchoring groups is investigated based on their molecular orbital’s (MO’s) energy gap (Eg). The electrostatic interaction between the synthesized dyes and metal nanoparticles, namely gold, silver and ruthenium, is believed to improve their performance as organic sensitizers. The dye-sensitized solar cells (DSSCs) are manufactured using the novel diazenyl pyridothiophene dyes, along with their metal nanoparticles conjugates as sensitizers, and were examined for efficiency improvement. Accordingly, using this modification, the photovoltaic performance was significantly improved. The promising results of conjugate (6b/AgNPs), compared with reported organic and natural sensitizers (JSC (1.136 × 10?1 mA/cm2), VOC (0.436 V), FF (0.57) and η (2.82 × 10?2%)), are attributed to the good interaction between the amide, methyl, amino and cyano groups attached to the thiophene pyridyl scaffolds and the surface of TiO2 porous film. Implementation of a molecular modeling study is performed to predict the ability of the thiophene moiety to be used in solar cell applications.
关键词： metal nanoparticle,plasmonic,organic sensitizers,tetrahydrobenzothiophenes,dye-sensitized solar cells,thienopyridine,HOMO-LUMO
更新于2025-09-23 15:19:57
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Investigating Various Permutations of Copper Iodide/FeCu Tandem Materials as Electrodes for Dye-Sensitized Solar Cells with a Natural Dye
摘要： This work presents the synthesis and deposition of CuI and FeCu materials on copper substrates for dye-sensitized solar cell applications. FeCu is a metastable alloy of iron and copper powders and possesses good optical and intrinsic magnetic properties. Coupled with copper iodide as tandem layers, the deposition of these two materials was permutated over a pure copper substrate, characterized and then tested within a solar cell. The cell was sensitized with a natural dye extracted from a local desert plant (Calotropis Gigantea) and operated with an iodine/triiodide electrolyte. The results show that the best layer arrangement was Cu/FeCu/CuI, which gave an efficiency of around 0.763% (compared to 0.196% from reported cells in the literature using a natural sensitizer).
关键词： natural sensitizers,copper iodine,FeCu alloys,dye-sensitized solar cells,Calotropis Gigantea,ball milling
更新于2025-09-23 15:19:57
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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
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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
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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
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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
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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
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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
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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