- 标题
- 摘要
- 关键词
- 实验方案
- 产品
过滤筛选
- 2019
- Dye-sensitized solar cell
- Photoelectrode
- Light scattering layer
- Transmittance
- White pigment (R902+)
- Rutile titanium dioxide
- Optoelectronic Information Materials and Devices
- Tribhuvan University
-
An efficient visible-light-responsive surface charge transfer complex AA-TiO2 based dye-sensitized solar cell
摘要： This work investigated a new strategy for visible light responsive dye-sensitized solar cell: the ligand-to-metal charge transfer (LMCT) takes place between TiO2 nanoparticles and ascorbic acid (AA). The surface LMCT complex AA-TiO2 extended the spectral responsive range to 800 nm and exhibited prominent visible light activity, enhancing utilization of the solar spectrum. The optimal photovoltaic conversion efficiency of the visible-light-responsive AA-TiO2 based dye-sensitized solar cell reach value of 3.50%. The low-cost, non-toxic and environment friendly surface adsorbate AA will demonstrate a feasible approach for replacing the most common used ruthenium complex dyes, thereby offering a strategy for development of low-cost and high efficiency DSSCs.
关键词： Dye-sensitized solar cell,Surface complex,Ligand-to-metal charge transfer (LMCT),Ascorbic acid,Visible light activity
更新于2025-09-23 15:19:57
-
Design and Synthesis of the Da????a??A-Structured Coadsorbents with the Phenanthraquinone Core and Its Application in Dye-Sensitized Solar Cells
摘要： Highly efficient different co-adsorbents using phenanthraquinone coupled with benzene/naphthalene as donor (D), benzene act as π-spacer (π) and variation in acceptor (A) like aromatic/aliphatic OH, COOH, triazole based derivatives were synthesized. These eight D-π-A based co-absorbents are effectively examined for their application in dye-sensitized solar cell (DSSC). The presence of hetero atoms and dense conjugated system paved a way for the hole mobility and in the rise of organic photovoltaic properties. Both the electrochemical and photovoltaic data gradually supported the studies by using I-/I3 - redox shuttle based electrolyte. Results from impedance, FTIR, UV, binding energy and HOMO-LUMO band gap calculations from density functional theory (DFT) were analysed to figure out the mechanistic way of our device. The TiO2 working electrode with N719 dye and synthesized CA-2 with iodolyte Z-50 as electrolyte has the highest PCE as 6.33% under an illumination of 100mW/cm2.
关键词： Photovoltaic properties,Co-adsorbents,Phenanthraquinone,D-π-A structure,Dye-sensitized solar cells
更新于2025-09-23 15:19:57
-
Predicting Device Parameters for Dye-Sensitized Solar Cells from Electronic Structure Calculations to Reproduce Experiment
摘要： Given that improvements to power conversion efficiency (PCE) of dye-sensitized solar cells (DSSCs) have slowed in recent years, a means to accurately predict device parameters yielded by trial dyes in silico, without having to synthesize them, would be extremely valuable to speed up the design process. Currently, the best performing methods of calculating device parameters rely on a set of experimentally determined kinetic coefficients. In practice, it is very difficult to measure these kinetic parameters accurately, limiting the overall accuracy of such predictive methods. This work proposes a model to obtain key parameters such as JSC, VOC and PCE using only results from density functional theory (DFT) and time-dependent DFT calculations, noting that rates of electron transfer steps are ultimately linked to the electronic structure of the dye…TiO2 working electrode. Six organic DSSC dyes from dissimilar chemical classes (L0, L1, L2, WS-2, WS-92 and C281) were chosen to demonstrate the power of this approach. Their a priori known experimentally determined device performance metrics served to validate our predictions. The greatest absolute error in our predicted PCE values was 0.36% relative to experiment, whilst the greatest fractional error was 0.042. This indicates the proposed model offers a dramatic improvement on previous predictive methods for DSSC device parameters, both in accuracy and consistency. Moreover, the spirit of designing such a predictive model has great potential to be applied to other photovoltaic applications, further enabling the design of novel, highly efficient photoactive materials.
关键词： performance prediction,energy-conversion efficiency,dye-sensitized solar cells,photovoltaic properties,density functional theory
更新于2025-09-23 15:19:57
-
Novel Heteroleptic Ruthenium(II) Complexes with 2,2a?2- Bipyridines Containing a Series of Electron-Donor and Electron-Acceptor Substituents in 4,4a?2-Positions: Syntheses, Characterization, and Application as Sensitizers for ZnO Nanowire-Based Solar Cells
摘要： A novel series of complexes of the formula [Ru(4,4′-X2-bpy)2(Mebpy-CN)](PF6)2 (X = ?CH3, ?OCH3, ?N(CH3)2; Mebpy-CN = 4-methyl-2,2′-bipyridine-4′-carbonitrile) have been synthesized and characterized by spectroscopic, electrochemical, and photophysical techniques. Inclusion of the electron-withdrawing substituent ?CN at one bpy ligand and di?erent electron-donor groups ?X at the 4,4′-positions of the other two bpy ligands produce a ?ne tuning of physicochemical properties. Redox potentials, electronic absorption maxima, and emission maxima correlate well with Hammett’s σ p parameters of X. Quantum mechanical calculations are consistent with experimental data. All the complexes can be anchored through the nitrile moiety of Mebpy-CN over ZnO nanowires in dye-sensitized solar cells that exhibit an improvement of light to electrical energy conversion e?ciency as the electronic asymmetry increases in the series.
关键词： Electron-donor and Electron-acceptor substituents,Ruthenium(II) complexes,ZnO nanowire-based solar cells,Dye-sensitized solar cells,2,2′-Bipyridines
更新于2025-09-23 15:19:57
-
Direct dynamic evidence of charge separation in a dyea??sensitized solar cell under operando conditions by Raman spectroscopy
摘要： Interfaces play an important role in enhancing the energy conversion performance of dye-sensitized solar cells (DSCs). The interface effects have been studied by many techniques, but almost all studies only performed on a portion of DSC, rather than on a complete solar cell. Hence, monitoring the interface evolution of a DSC is still very challenging. Here, in situ/operando resonance Raman (RR) spectroscopic analyses were carried out to monitor the dynamic observations of the photovoltaic conversion process from a DSC. We observed the creation of new species (i.e., polyiodide and iodine aggregates) in the photosensitization process. We also successfully identified molecular-scale dynamic evidence that the bands from the C═C of 2,2’-bipyridyl (bpy), the S═C═N of NCS ligand and photochemical products show reasonably strong intensity and frequency changes, which clearly demonstrates that they are important pathways of charge separation. Furthermore, RR spectroscopy also be applicable to quickly evaluate the performance of DSCs.
关键词： dye-sensitized solar cell,semiconductor,TiO2 nanotube array,Raman spectroscopy,charge transfer
更新于2025-09-23 15:19:57
-
Phenanthrenea??Fuseda??Quinoxaline as Key Building Block for Highly Efficient and Stable Sensitizers in Copper Electrolyte Based Dyea??Sensitized Solar Cells
摘要： Dye-sensitized solar cells (DSSCs) based on Cu(II/I) bipyridyl or phenanthroline complexes as redox shuttles have achieved very high open-circuit voltages (VOC, > 1 V). However, their short-circuit photocurrent density (JSC) has remained modest. The challenge for increasing the JSC is expected to extend the spectral response of sensitizers to the red or NIR region while maintaining efficient electron injection in the mesoscopic TiO2 film and fast regeneration by the Cu(I) complex. Here, we report two new D-A-π-A featured sensitizers coded HY63 and HY64, which employ either benzothiadiazole (BT) or phenanthrene-fused-quinoxaline (PFQ) as the auxiliary electron-withdrawing acceptor moiety. In spite of very similar energy levels and absorption onsets, HY64-based DSSCs outperform largely their HY63 counterpart, achieving an outstanding power conversion efficiency (PCE) of 12.5% with superior stability. In depth studies of interfacial charge carrier dynamics show that PFQ is superior to BT in retarding charge recombination resulting in near quantitative collection of photogenerated charge carriers.
关键词： sensitizers,light-harvesting,dye-sensitized solar cells,copper redox shuttle,charge recombination
更新于2025-09-23 15:19:57
-
White Painting Pigment as a Low-Cost Light Scattering Material for Bilayer Photoelectrodes of Dye-Sensitized Solar Cells
摘要： White pigment (DuPont R902+) has been used as a light scattering material in the preparation of bilayer photoelectrodes of dye-sensitized solar cells (DSCs). The X-ray diffraction (XRD) pattern of the white pigment revealed that the material consists of rutile phase of titanium dioxide. The light scattering layer prepared from the white pigment was coated onto the main-layer of the photoelectrodes of DSCs. The solar cells with and without light scattering layer were tested in the simulated light of 100 mW/cm2. The DSCs with the light scattering layer generated more current density than the DSCs without scattering layer and the overall light to electric power conversion efficiency of DSCs with the light scattering layer was ~4.00 % compared with 3.25 % efficiency of the DSCs without the scattering layer.
关键词： Dye-sensitized solar cell,Photoelectrode,Light scattering layer,Transmittance,White pigment (R902+),Rutile titanium dioxide
更新于2025-09-23 15:19:57
-
Poly(ethylene glycol)a??poly(propylene glycol)a??poly(ethylene glycol) and polyvinylidene fluoride blend doped with oxydianiline-based thiourea derivatives as a novel and modest gel electrolyte system for dye-sensitized solar cell applications
摘要： Unique symmetrical thiourea derivatives with an oxydianiline core were synthesized using cost-effective and simple methods. A new gel electrolyte system was prepared using these thiourea additives along with a highly conductive PEG–PPG–PEG block copolymer, PVDF, and an iodide/triiodide redox couple. The PEG units present in the electrolyte are well-known for their intense segmental motion of ions, which can degrade the recombination rate and favour the charge transfer. The thiourea additives interacted well with the redox couple to limit iodine sublimation and their adsorption induced a negative potential shift for TiO2. The highest efficiency attained by utilizing such gel polymer electrolytes was 5.75%, especially with 1,10-(oxybis(4,1-phenylene))bis(3-(6-methylpyridin-2-yl) thiourea) (OPPT), under an irradiation of 100 mW cm?2. The electrochemical impedance spectroscopy, UV-vis absorption spectroscopy, differential scanning calorimetry, and FTIR spectroscopy data of such gel polymer electrolytes favoured the PCE order of the additives used in DSSCs. The improvement in the DSSC performance with symmetrical thioureas having electron-rich atoms was practically attributed to the reduction of back electron transfer, dye regeneration, and hole transport.
关键词： Poly(ethylene glycol),poly(ethylene glycol),dye-sensitized solar cell,polyvinylidene fluoride,poly(propylene glycol),oxydianiline-based thiourea derivatives,gel electrolyte system
更新于2025-09-23 15:19:57
-
An All Carbon Dye Sensitized Solar Cell: A Sustainable and Low-Cost Design for Metal Free Wearable Solar Cell Devices
摘要： Lightweight carbon electrodes are the new candidates for photovoltaic devices due to their temperature resistivity, ease of fabrication, and skin comfortability. Herein, a sustainable and facile strategy has been proposed for metal free all carbon dye sensitized solar cell (C-DSSC), assembled by stacking carbon front electrode (CFE) and carbon counter electrode (CCE). The CFE demonstrated adequate light transmittance (70-50%) while maintaining efficient photon absorption and charge separation mechanism due to dye coated TiO2 nanorods (P25-R). The graphene dip coated carbon counter electrode (Gr@CCE) possesses remarkable highly electro catalytic activity towards 3 /I ― I ― redox couple with low charge transfer resistance (RCT=0.79 ?). The sustainable design of C-DSSC attained ~6±0.5 % efficiency with high photocurrent density of 18.835 mA. cm-2. The superior performance of C-DSSC is accredited to its improved charge mobility, low internal resistance, and better interfacial electrode contact. The thickness of C-DSSC is ≤3 mm eliminates the need for rigid glass in DSSC.
关键词： Carbon,TiO2 nanorods,Dye sensitized solar cell,Graphene,Electrocatalytic activity
更新于2025-09-23 15:19:57
-
A Quantification Procedure for Interior Performance of Architectural Openings Associated with Dye-Sensitized Solar Cells
摘要： Windows with various colors are important design elements used widely ranging from traditional architecture to contemporary buildings to express the architectural fa?ade, the interior atmosphere, and so on. Recently, there is a possibility that solar cells can be used to replace windows with various colors. In particular, attempts to manufacture windows using Dye-Sensitized Solar Cells (DSSCs) are actively underway. Accordingly, there is a need to determine physical and environmental performances of DSSCs. This study attempted a methodological approach to evaluate indoor environmental performance of windows and DSSCs. The concept of color gamut overage normally used in the field of displays was utilized to evaluate color expressions. In addition, a standard visual inspection table suggested by the International Ophthalmological Society was used to evaluate the recognition of shapes. This study compared performances between RGB color windows and DSSCs using the two above previous concepts. Measurement data showed that most DSSCs performed poorly in comparison with architectural color windows. However, some DSSCs showed good enough performances that could be used as alternatives of architectural color windows. Green DSSCs with VLT 18% had a color gamut similar to clear glasses. Blue DSSCs with VLT 18% were found to have similar or better shape recognition than current architectural color windows. Based on these results, limitations of DSSCs as alternatives of architectural color windows and their future development directions are suggested.
关键词： indoor environment,shape recognition,color gamut overage,color environment,dye-sensitized solar cells,architectural window
更新于2025-09-23 15:19:57