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Organosoluble Starch-Cellulose Binary Polymer Blend as a Quasi-Solid Electrolyte in a Dye-Sensitized Solar Cell
摘要： This work is a pioneer attempt to fabricate quasi-solid dye-sensitized solar cell (QSDDSC) based on organosoluble starch derivative. Rheological characterizations of the PhSt-HEC blend based gels exhibited viscoelastic properties favorable for electrolyte fabrication. From amplitude sweep and tack test analyses, it was evident that the inclusion of LiI improved the rigidity and tack property of the gels. On the other hand, the opposite was true for TPAI based gels, which resulted in less rigid and tacky electrolytes. The crystallinity of the gels was found to decline with increasing amount of salt in both systems. The highest photoconversion e?ciency of 3.94% was recorded upon addition of 12.5 wt % TPAI and this value is one of the highest DSSC performance recorded for starch based electrolytes. From electrochemical impedance spectroscopy (EIS), it is deduced that the steric hindrance imposed by bulky cations aids in hindering recombination between photoanode and electrolyte.
关键词： dye-sensitized solar cell,phthaloyl starch,rheology,hydroxyethyl cellulose,quasi-solid electrolyte
更新于2025-09-16 10:30:52
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Ni3S2@MWCNTs films for effective counter electrodes of dye-sensitized solar cells
摘要： Composite films nickel sulfide (Ni3S2) nanoparticles were grown on multiwall carbon nanotubes (MWCNTs) and in situ coated onto conducting glass substrates by the hydrothermal process at 170 °C. These Ni3S2@MWCNTs films were applied for counter electrodes (CEs) of dye-sensitized solar cells (DSSCs). In this work, nanostructure, crystalline structure, electrochemical activities and electron-charge transfer resistance of CEs were studied. In addition, the effective surface areas of CEs were analyzed and discussed as well. The power conversion efficiency (PCE) enhancement of up to 7.48%, compared with that of Ni3S2-DSSC, was demonstrated for a Ni3S2@MWCNTs DSSC.
关键词： Counter electrode,Ni3S2,Dye-sensitized solar cell,Hydrothermal method,Multiwall carbon nanotubes
更新于2025-09-16 10:30:52
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Effect of Titanium Dioxide (TiO2) Light Scattering Layer deposited by Spray Deposition Method at Room Temperature for Dye-sensitized Solar Cell (DSSC)
摘要： TiO2 light scattering layer was prepared form TiO2 (Degussa P25) colloidal solution of 0.75% by Wt. by spray coating machine under O2 gas. The conditions were varied with pulse spray at 5, 10, 15 and 20 times under substrate rotation deposited on the nano-porous TiO2/FTO substrate. The TiO2 working electrodes were sintered at 500°C for 1 hour and lead to immersed in dye sensitizer for 24 hours. Morphological, structural and optical properties were analyzed by scanning electron microscopy (SEM), X-ray diffraction (XRD) and UV-vis spectrophotometer, respectively. DSSC cells were fabricated by the TiO2 working electrodes sandwich with the Pt counter electrode. Photo-conversion efficiency of DSSC cells were compared between the standard cells which non-TiO2 scattering layer and the TiO2 scattering layer by solar simulator (AM 1.5). Structural characteristic exhibits crystalline of anatase phase TiO2 plane (101). Surface morphology is beginning uniform distribution when the pulses spray since to 15 times and obtains nano-microparticles sizes. Moreover, thickness of TiO2 light scattering layer and TiO2 working electrodes have approximately of 1 to 1.5 μm and 10 to 20 μm. Transmittances spectra of have lower 50%. Reflections spectra have lower of 50% and absorbance can be absorbed of 1 to 2% show that low transmittance, low reflection and low absorption in visible light which occur light scattering effect in TiO2 scattering layer well. The efficiency can be highest obtains which consists of the open circuit voltage (Voc), the current density (Jsc), fill factor (FF) and efficiency (η) of 0.77 V, 14.57 mA/cm2, 0.65 and 7.33% for TiO2 scattering layer at pulsed spray of 10 times more than standard cell. Summary, the effect of TiO2 light scattering layer supports to increases light scattering into cell cause photon absorption increases lead to efficiency increases show that TiO2 scattering layer suitable for development of DSSC.
关键词： dye-sensitized solar cell,TiO2 scattering layer,spray deposition
更新于2025-09-16 10:30:52
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Synthesis of D-π-A type 4,5-diazafluorene ligands and Ru (II) complexes and theoretical approaches for dye-sensitive solar cell applications
摘要： In this paper, we synthesized and characterized 4,5-diazafluorene-derived ligands and their Ruthenium complexes containing conjugate and anchor groups. These groups on the designed molecules were investigated for the contribution of electrical transformation efficiency in prepared dye sensitive solar cell (DSSC). The structure of the compounds was determined by FTIR, UV-Vis Spectrometer, NMR, and MS spectroscopic data. Theoretical calculations were performed with density functional theory (DFT) methods. The electronic, spectral and quantum chemical properties of the ligand and complex molecules were calculated by using B3LYP/6-311++G(d,p)/SDD basis set. In order to determine the electron density on the molecules, we compared the results of the theoretical studies with the measured photovoltaic properties of DSSC devices. The photovoltaic cell efficiencies (PCE) of the devices were in the range of 0.22-1.05 % under simulated AM 1.5 solar irradiation of 100 mW.cm-2, and the highest open-circuit voltage (Voc) reached 0.628 V. The C4 compound DSSC provided 1.05% efficiency, while the DSSC Ru-C4 complex exhibited performance at 0.35% efficiency under illumination. According to this result, it was observed that the electron movement on the Ru(II) complexes could not reach the anchor group as much as the ligands.
关键词： 4,5-Diazafluorene,DFT,Dye-sensitized solar cell,Schiff base
更新于2025-09-16 10:30:52
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In situ growth of Ni-encapsulated and N-doped carbon nanotubes on N-doped ordered mesoporous carbon for high-efficiency triiodide reduction in dye-sensitized solar cells
摘要： A new micro-nanostructured composite (NOMC-Ni@NCNTs) of Ni-encapsulated and N-doped carbon nanotubes (Ni@NCNTs) pinned on N-doped ordered mesoporous carbon (NOMC) is constructed by a two-step synthesis strategy. The strategy involves the self-assembly preparation of water-soluble phenolic resin/F127 colloid by a hydrothermal route and the subsequent catalytic pyrolysis of as-prepared phenolic resin/F127 copolymer and melamine with nickel acetate as Ni source and self-generated catalyst, leading to the in situ growth of dispersive Ni@NCNTs pinned on NOMC through the Ni junction. In the resultant NOMC-Ni@NCNTs, the NOMC shows reduced particle size and shortened mesopore channel length of 15-30 μm compared to 850 μm-2 mm of pristine NOMC. The pinned Ni@NCNTs constructs a 3D conductive scaffold in the composite and the conductivity is correspondingly raised from 20.4 S cm-1 of pristine NOMC to 254.1 S cm-1 of NOMC-Ni@NCNTs. The particle size, mesoporosity and surface area of NOMC-Ni@NCNTs composite are also flexibly regulated by tailoring the relative content of Ni@NCNTs and NOMC. The new-structured NOMC-Ni@NCNTs composites are developed as counter electrode (CE) materials for DSSCs, which demonstrates an excellent catalytic activity towards I3? reduction. The optimum NOMC-Ni@NCNTs CE delivers a low charge-transfer resistance of 2.21 Ω and the assembled DSSC achieves a high power conversion efficiency of 8.39%. Moreover, the NOMC-Ni@NCNTs CE based DSSC also manifests a preeminent electrochemical stability in corrosive I?/I3? electrolyte with a remnant efficiency of 7.82% after 72 h of illumination. The outstanding electrocatalytic performance is mainly correlated with their unique architecture, in which the pinned Ni@NCNTs conductive substrate accelerates the electron transportation among NOMC micron-particles, and the amorphous NOMC with short-range mesopores accelerates the electrolyte diffusion and supplies abundant ions-accessible defects for I3? reduction.
关键词： Counter electrode,Synergistic catalytic effect,Dye-sensitized solar cell,Ni@NCNTs pinned NOMC composite,Two-step synthesis strategy
更新于2025-09-16 10:30:52
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Orange photoluminescent N-doped graphene quantum dots as an effective co-sensitizer for dye-sensitized solar cells
摘要： In this research, nanocoral (NC) film of TiO2 was decorated with nitrogen-doped graphene quantum dots (NGQDs, average size of ～ 9 nm) and photovoltaic properties were investigated for dye-sensitized solar cell application. TiO2 NCs and NGQDs synthesized separately using the hydrothermal method and TiO2 NCs were decorated with NGQD solution by spin coating. FESEM images prove that TiO2 NCs are composed from nanorods, with an average diameter of about 60 nm. Optical characterization shows that the NGQDs are highly orange-luminescent (emission at 590 nm) and absorb UV and visible light photons. Using NGQDs together with N719 dye as co-sensitizers led to an improvement in efficiency of DSSC, as investigated by photoelectrical measurements. The experimental analysis reveals that this improvement arises from enhancement of charge separation and collection due to the cascaded energy levels because of presence of NGQDs. By addition of NGQDs into TiO2 NC photoanode, we were able to increase the short-circuit current density and efficiency by 40% (from 12.61 to 17.65 mA/cm2) and 31% (from 5.72 to 7.49%), respectively.
关键词： Nitrogen,Hydrothermal,Graphene quantum dots,Dye-sensitized solar cell
更新于2025-09-16 10:30:52
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Cobalt complex dye as a novel sensitizer in dye sensitized solar cells
摘要： In this study, cobalt metal complex has been introduced as a novel class of sensitizer for more mechanistic consideration of the photovoltaic conversion efficiency (PCE) of dye sensitized solar cells. UV-Vis spectroscopy of dye illustrates maximum absorption at wavelengths of dye in 498 and 650 nm. TiO2 was used as the photoanode of the cell whose X-ray diffraction spectrum indicates that its crystal phase is anatase (101). Surface morphology of photoanode was also investigated by scanning electron microscopy (SEM) and obviously showed ~25nm TiO2 nanoparticles. The cyclic voltammetry (CV) investigation of Pt-coated fluorine doped tin oxide (FTO) as the counter electrode of the cell indicates redox process on this electrode. Photovoltaic measurements of cobalt complex sensitized solar cell show that the short-circuit current density (JSC), open-circuit voltage (VOC), fill factor (FF%) and photovoltaic conversion efficiency (PCE%) are 48.80 μA.cm-2, 0.7 V, 44% and 0.09% at the air mass 1.5 (100mW.cm-2) irradiation condition, respectively. The high light harvesting efficiency (LHE) (~61%) and high molar absorption coefficient of the cobalt complex dye (12,500 M-1.cm-1) were other optical advantages of the cobalt complex sensitized solar cell. The results indicate the quantum yield of electron injection (φing) which depends on dye structure as a parameter influences the JSC. The pyridine rings conformation in donor part of the cobalt complex dye plays a significant role in φing and subsequently PCE. These findings open a new insight about mechanistic aspects of dye sensitized solar cells efficiency.
关键词： Dye-sensitized solar cell,Photoanode,Dye,Counter electrode,Photovoltaic measurement,Cobalt complex
更新于2025-09-12 10:27:22
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[IEEE TENCON 2019 - 2019 IEEE Region 10 Conference (TENCON) - Kochi, India (2019.10.17-2019.10.20)] TENCON 2019 - 2019 IEEE Region 10 Conference (TENCON) - Investigation of “Keriang” fruit Dye application on the performance of Dye-Sensitized solar cell with anatase-rutile TiO <sub/>2</sub> Electrode
摘要： Dye-sensitized solar cell (DSSC) or ‘Gratzel cell’ is a low-cost solar cell from the thin film family which consists of TiO2 electrode coating, sensitizer from dye molecules soaked in the TiO2 film, a mediator electrolyte layer, and a counter electrode. This paper focuses on fabricating dye-sensitized solar cell (DSSC) with anatase and anatase-rutile mixture of nanocrystalline TiO2 at varied thickness sensitized with high light-absorbing nature dye and an alternative conductive counter electrode catalytic material. This paper proposes on the potentials of 10 μm thickness of rutile-anatase (RA) with a 1:4 ratio concentration, absorbed into a high concentration anthocyanin from ‘keriang’ fruit extract and by the use of carbon as a counter electrode. This arrangement shows the highest solar cell efficiency at 1.16% with higher short circuit current of 5.5 mA/cm2 and fill factor of 0.55 which is the highest among overall experimented nature-based solar cell.
关键词： Keriang,Rutile,Anatase,TiO2,Dye,DSSC,Dye-Sensitized solar cell
更新于2025-09-12 10:27:22
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The effect of bis-carboxylic groups of squarylium dyes on the efficiency of dye-sensitized solar cells
摘要： Symmetric squarylium dye (SQIND1) with bi-carboxylic groups has been synthesized and photoelectrochemical properties have been studied in comparison with its non-functionalized analog groups (SQIND2). The experimental results showed that the introduction of anchor carboxylic groups in SQIND1 sensitizer provides a more intimate contact with nanoparticles TiO2 which increases the number of charge carriers transferred from the SQIND1 to the semiconductor. The theoretical calculations and absorbance results show that the electron density of LUMO of SQIND1 is delocalized in the whole chromophore, leading to strong electronic coupling between SQIND1 sensitizer and conducting band of TiO2, resulting in improved dye-sensitized solar cell efficiency compared to SQIND2. Hence, the SQIND1 sensitized exhibit better photovoltaic performance. Although, the absence of any linker groups in the SQIND1, then SQIND1 was perfect efficiently sensitized on porous TiO2 with the long UV–Vis and NIR region up to 800?nm of the spectrum and showed higher remarkable performance of values, such as η of 3.3%, a Jsc of 7.6?mA/cm2, a Voc of 0.59, and FF of 0.73.
关键词： Cyclic voltammetry,Dye-sensitized solar cell,Symmetric squarylium dyes,Photoelectrochemical properties,DFT
更新于2025-09-12 10:27:22
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Surface Carbon Shell-Functionalized ZrO2 as Nanofiller in Polymer Gel Electrolyte-Based Dye-Sensitized Solar Cells
摘要： We prepare dye-sensitized solar cells (DSSCs) fabricated with a poly (ethylene glycol) based polymer gel electrolytes (PGEs) incorporating surface carbon shell-functionalized ZrO2 nanoparticles (ZrO2-C) as nano?llers (NFs). ZrO2 are polymerized via atom transfer radical polymerization (ATRP) using poly (ethylene glycol) methyl ether methacrylate (POEM) as a sca?old to prepare the ZrO2-C through carbonization. The power conversion e?ciency of DSSC with 12 wt% ZrO2-C/PGEs is 5.6%, exceeding that with PGEs (4.4%). The enhanced e?ciency is attributed to Lewis acid-base interactions of ZrO2-C and poly (ethylene glycol), catalytic e?ect of the carbon shells of ZrO2-C, which results in reduced crystallinity, enhanced ion conductivity of electrolytes, decreased counterelectrode/electrolyte interfacial resistance, and improved charge transfer rate. These results demonstrate that ZrO2-C introduction to PGEs e?ectively improves the performance of DSSCs.
关键词： polymer gel electrolyte (PGE),zirconium dioxide (ZrO2),dye-sensitized solar cell (DSSC),nano?ller (NF),carbon,atom transfer radical polymerization (ATRP)
更新于2025-09-12 10:27:22