- 标题
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Plasma-processed CoSn/RGO nanocomposite: A low-cost and sustainable counter electrode for dye-sensitized solar cells
摘要： The high cost of state-of-the-art Pt counter electrodes (CEs) hinders the large-scale applications of dye-sensitized solar cells (DSCs). The development of Pt-free catalysts while maintaining state-of-the-art catalytic activity for CE materials is one mean to reduce costs. Here, CoxSn1-x/reduced graphene oxide (RGO) (0 ≤ x ≤ 1) nanohybrids were synthesized and employed as inexpensive, stable, and earth-abundant CEs in DSCs. The synthesis was performed through the plasma-assisted reduction of the oxygen functional groups of the graphene oxide along with the immobilization of bimetallic nanoparticles (NPs) on the surface of RGO. The optimization of the composition of the alloy NPs for the highest e?ciency of DSC yields the Co0.9Sn0.1/RGO nanocomposite. The highest device performance correlates well with the experimentally obtained lowest charge transfer resistance in conjunction with the highest electrocatalytic activity of the Co0.9Sn0.1/RGO CE. The DSC employed the synthesized CE showed good stability over long term operation. Both the developed CoSn/RGO nanohybrids and the strategy used for their synthesis are cost-e?ective. Our results provide economically implementable and green nanotechnology for e?cient and stable DSCs required for commercialization.
关键词： Plasma reduction,Bimetalic alloy CoxSn1-x,Nanohybrids,Reduced graphene oxide,Counter electrode,Dye-sensitized solar cells
更新于2025-09-23 15:19:57
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Transformation of a liquid electrolyte to a gel inside dye sensitized solar cells for better stability and performance
摘要： A gel electrolyte based on a metal-organic framework (MOF), comprised of Al3+ and trimesic acid, was used in dye-sensitized solar cells. The electrolyte was gelated inside the solar cell to ensure the best interfacial connection between the TiO2 photoanode and electrolyte ingredients. The photovoltaic performance of the solar cells showed that the gel has a good ability to preserve the function of liquid electrolytes. By optimizing the ratio of MOF and liquid electrolyte, the current density was improved, which was due to the increase in the redox couple I-/I3- content in the gel electrolyte. The open-circuit voltage was affected because of the change in the conduction band of TiO2 by the introduction of Al3+ ions and also because of electron recombination. Thus, a slightly higher efficiency was achieved using the gel electrolyte compared to the liquid electrolyte based cells. A superior stability was achieved with the MOF gel electrolyte under thermal stress at 60 °C for 250 h, while the efficiency of cells with liquid electrolyte deteriorated continuously under the same conditions. The drop in efficiency in the liquid electrolyte cells, was 24%, compared to only a 6% drop in the MOF gel electrolyte cells.
关键词： Stability,Metal organic framework,Dye sensitized solar cells,Thermal stress,Gel electrolyte
更新于2025-09-23 15:19:57
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Porphyrin dyes bearing heterocyclic anchoring groups for dye-sensitized solar cells with enhanced efficiency and long-term stability: further optimization of champion porphyrin dye SM315
摘要： In order to further enhance the long-term stability of porphyrin-based dye-sensitized solar cells (DSSCs) without losing their high efficiency, a serious of porphyrin sensitizers based on the champion dye SM315 but differing in the anchoring groups were theoretically investigated. Compared with SM315 with carboxylic acid anchoring groups, our results demonstrate that porphyrin dyes with hydantoin and barbituric acid anchoring groups exhibit stronger adsorption stability because of the larger orbital interactions between the dye and the semiconductor surface, according to the energy decomposition analysis. Furthermore, porphyrin dyes with these two heterocyclic anchoring groups can also display a superior or comparable charge separation and injection, light harvesting ability and conduction band energy shift, which are the key factors that affect the performance of DSSCs. These results highlight the great potential hydantoin and barbituric acid anchoring groups possess as effective alternatives to carboxylic acid anchoring groups for porphyrin dyes, which could yield an enhanced efficiency and long-term stability and worthy of being experimentally synthesized.
关键词： Adsorption stability,Porphyrin,Heterocyclic anchoring groups,Dye-sensitized solar cells,Theoretical study
更新于2025-09-23 15:19:57
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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
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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
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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
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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
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Influence of 1-methyl-3-propylimidazolium iodide ionic liquid on the performance of dye-sensitized solar cell using hexanoyl chitosan/poly(vinyl chloride) based polymer electrolyte
摘要： Polymer electrolytes based on hexanoyl chitosan/poly(vinyl chloride) (PVC) were prepared by employing sodium iodide (NaI) as the doping salt and 1-methyl-3-propylimidazolium iodide (MPImI) as the ionic liquid. The concentration of MPImI was varied from 2 to 10 wt.% while the amount of polymer and salt were kept constant. The effect of MPImI on the crystallinity, structural and conductivity properties of hexanoyl chitosan/PVC-NaI have been investigated. XRD results show that MPImI disrupts the crystallinity of polymer matrix while FTIR results show the existence of interactions among components in hexanoyl chitosan/PVC-NaI-MPImI. Polymer electrolyte without MPImI shows the highest conductivity of 1.5 × 10?5 S cm?1 at 303 K. Upon incorporation of MPImI, increment in conductivity can be observed. The hexanoyl chitosan/PVC-NaI-MPImI electrolytes were assembled into dye-sensitized solar cells (DSSCs) and the dependence of DSSCs performance on MPImI concentration has been investigated. DSSC with 8 wt.% of MPImI shows the energy conversion efficiency, η of 4.55 % with short circuit current density, Jsc of 10.34 mA cm?2 and open circuit voltage, Voc of 0.74 V.
关键词： PVC,Conductivity,Polymer electrolyte,Dye-sensitized solar cells,Hexanoyl chitosan
更新于2025-09-23 15:19:57
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Synthesis, properties and photovoltaic performance in dye-sensitized solar cells of three <i>meso</i> -diphenylbacteriochlorins bearing a dual-function electron-donor
摘要： Bacteriochlorins are crucial to photosynthesis in bacteria. Studies of air-stable, meso-substituted bacteriochlorins are rare. We herein report the synthesis, properties, and photovoltaic performance of three new air-stable, meso-substituted bacteriochlorins bearing a dioctylfluorenylethyne (denoted as LS-17), a dioctylaminophenylethynylanthrylethyne (LS-43), and a diarylaminoanthrylethyne (LS-45) as the electron-donating groups. Among these LS-bacteriochlorins, LS-17 displays sharp UV-visible absorption bands whereas LS-43 and LS-45 give rise to broadened and red-shifted absorptions. Electrochemical and DFT results suggest that the first oxidation and reduction reactions of these bacteriochlorins are consistent with the formation of the cation and anion radicals, respectively. For dye-sensitized solar cell applications, photovoltaic performance of the LS-45 cell achieves an overall efficiency of 6.04% under one-sun irradiation.
关键词： bacteriochlorins,dye-sensitized solar cells,properties,synthesis,photovoltaic performance
更新于2025-09-23 15:19:57
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Efficient Solar Cells based on Concerted Companion Dyes Containing Two Complementary Components: An Alternative Approach for Cosensitization
摘要： With the purpose to achieve panchromatic absorption for constructing efficient dye-sensitized solar cells (DSSCs), the cosensitization approach of using two dyes with complementary absorption has been developed with great success. However, this approach usually requires time-consuming optimization of a number of parameters for controlling the ratio and distribution of the two coadsorbed dyes on TiO2 film, which limits the potentials of this strategy. We herein report an alternative approach for developing efficient DSSCs by designing a class of “concerted companion dyes” with two complementary dye components linked covalently. Thus, a newly synthesized organic dye Z2 was linked to a recently reported doubly strapped porphyrin dye XW51 through flexible chains with various lengths to afford XW60?XW63. These dyes exhibit excellent absorption and efficiencies in the range of 8.8%-11.7%. Notably, upon coadsorption with chenodeoxycholic acid (CDCA), XW61 affords an impressive efficiency of 12.4%, a record for iodine electrolyte-based DSSCs, to the best of our knowledge. In addition, these dyes also exhibit the advantages of easy cell fabrication, simple optimization, as well as excellent photostability.
关键词： dye-sensitized solar cells,photovoltaic performance,concerted companion dyes,cosensitization,panchromatic absorption
更新于2025-09-23 15:19:57