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Transparent MoS <sub/>2</sub> /PEDOT Composite Counter Electrodes for Bifacial Dye-Sensitized Solar Cells
摘要： Dye-sensitized solar cells (DSSCs) are solar energy conversion devices with high efficiency and simple fabrication procedures. Developing transparent counter electrode (CE) materials for bifacial DSSCs can address the needs of window-transparent-type building-integrated photovoltaics (BIPVs). Herein, transparent organic?inorganic hybrid composite films of molybdenum disulfide and poly(3,4-ethylenedioxythiophene) (MoS2/PEDOT) are prepared to take full advantage of the conductivity and electrocatalytic ability of the two components. MoS2 is synthesized by hydrothermal method and spin-coated to form the MoS2 layer, and then PEDOT films are electrochemically polymerized on top of the MoS2 film to form the composite CEs. The DSSC with the optimized MoS2/PEDOT composite CE shows power conversion efficiency (PCE) of 7% under front illumination and 4.82% under back illumination. Compared with the DSSC made by the PEDOT CE and the Pt CE, the DSSC fabricated by the MoS2/PEDOT composite CE improves the PCE by 10.6% and 6.4% for front illumination, respectively. It proves that the transparent MoS2/PEDOT CE owes superior conductivity and catalytic properties, and it is an excellent candidate for bifacial DSSC in the application of BIPVs.
关键词： building-integrated photovoltaics,transparent counter electrode,MoS2/PEDOT composite,bifacial illumination,Dye-sensitized solar cells
更新于2025-09-19 17:13:59
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Application of carbon dots in dye‐sensitized solar cells: A review
摘要： Carbon dots (CDs) are a kind of zero-dimensional carbon-based nanoparticles with superb light-trapping ability, high optical absorption ability, and superior intrinsic catalytic activity. Due to these advantageous properties, they have received enthusiastic attention from researchers in the field of optical devices. The application of carbon dots in dye-sensitized solar cells has increased with steady steps recently, especially as a substitute for precious Ru-sensitizers and Pt counter electrodes. In this review, we classified the application of carbon dots in dye-sensitized solar cells in recent years and explained the mechanisms of improving the performance of carbon dots. The significant impact of surface functionalization of CDs on the performance of dye-sensitized solar cells was discussed. Lastly, some challenges and application prospects of carbon dots in the dye-sensitized solar cell were proposed, which is meaningful for the further exploration and application of carbon dots as a new energy material.
关键词： sensitizer,counter electrode,carbon dots,surface functionalization,dye-sensitized solar cells
更新于2025-09-19 17:13:59
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MoS2/Ni-CoSx porous nanocubes derived from Ni–Co prussian-blue analogs as enhanced Pt-free electrode catalysts for high-efficiency dye-sensitized solar cells
摘要： Owing to the modifiable compositions and morphologies, high-efficiency clean energy catalysts with complex functional structures attract wide-ranging attention. Herein, this report focuses on the controllably morphological MoS2-doped NiS2/Co3S4 nanocubes which are derived from nickel-cobalt Prussian-blue analogs. After annealing in N2 flow, MoS2/Ni-CoSx porous nanocubes are prepared via regulating the reactant ratios (1/2, 1/1 and 2/1) between (NH4)2MoS4 and Ni–Co Prussian-blue analogs. In the synthesis progress, (NH4)2MoS4 is applied as a bifunctional dopant source, which can expediently offer Mo and S elements simultaneously. The quaternary porous MoS2/Ni-CoSx (1/1) with the reasonable chemical composition, considerable specific surface area (86.7 m2 g?1) and excellent electrocatalytic property can be selected as the representative counter electrode catalyst in dye-sensitized solar cells. Furthermore, the solar cell with MoS2/Ni-CoSx (1/1) exhibits a higher power conversion efficiency (9.80%) than that of Pt (8.19%) under a standard irradiation.
关键词： Prussian-blue analogs,Dye-sensitized solar cells,(NH4)2MoS4,Nanocubes,MoS2/Ni-CoSx,Electrocatalytic property
更新于2025-09-19 17:13:59
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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2025-09-19 17:13:59
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A study on the fabrication and characterization of dye-sensitized solar cells with Amaranthus red and Lawsonia inermis as sensitizers with maximum absorption of visible light
摘要： Dye-sensitized solar cells (DSSC) were fabricated with dyes extracted from the leaves of Amaranthus red and Lawsonia inermis (Henna). A total of ten dyes were synthesized using solvents like distilled water, acetone and ethanol. UV–Vis spectroscopy was taken for all the dyes prepared. FTIR was taken for the dyes which had maximum absorption in the visible region. FTO substrates coated with nanosized TiO2 sensitized with dyes extracted were the photoanodes. Counter cathode was primed using graphene-coated FTO films. Two solar cells have been made up with the efficient dyes prepared from Amaranthus and Henna. J–V characterization performed for the cells showed that the solar cell fabricated with Amaranthus dye was efficient with the photoconversion efficiency and fill factor of 0.14% and 0.3864, respectively, compared to the cells fabricated using Henna dye whose photoconversion efficiency and fill factor are 0.09% and 0.3851, respectively.
关键词： UV–Vis spectroscopy,Lawsonia inermis,FTIR,Photoconversion efficiency,Dye-sensitized solar cells,Amaranthus red
更新于2025-09-19 17:13:59
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Photoexcitation Processes in Oligomethine Cyanine Dyes for Dye-Sensitized Solar Cellsa??Synthesis and Computational Study
摘要： We report density functional theory (DFT) calculations of three newly synthesized oligomethine cyanine-based dyes as potential TiO2-sensitizers in dye-sensitized solar cells. The three dyes have π-symmetry and the same acceptor side, terminating in the carboxylic anchor, but they differ through the π-bridge and the donor groups. We perform DFT and time-dependent DFT studies and present the electronic structure and optical properties of the dyes alone as well as adsorbed to the TiO2 nanocluster, to provide some predictions on the photovoltaic performance of the system. We analyze theoretically the factors that can influence the short circuit current and the open circuit voltage of the dye-sensitized solar cells. We examine the matching of the absorption spectra of the dye and dye-nanocluster system with the solar irradiation spectrum. We display the energy level diagrams and discuss the alignment between the excited state of the dyes and the conduction band edge of the oxide as well as between the redox level of the electrolyte and the ground state of the dyes. We determine the electron density of the key molecular orbitals and analyze comparatively the electron transfer from the dye to the semiconducting substrate. To put our findings in the right perspective we compare the results of our calculations with those obtained for a coumarin-based dye used in fabricating and testing actual devices, for which experimental data regarding the photovoltaic performance are available.
关键词： optical spectra,titanium dioxide cluster,dye-sensitized solar cells,oligomethine cyanine-based dyes,density functional theory
更新于2025-09-19 17:13:59
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Synergistic enhancements in the performances of dye-sensitized solar cells by the scattering and plasmon resonance of Au-nanoparticle multi-shell hollow nanospheres
摘要： Novel multi-shell hollow SiO2@Au@TiO2 (HSAT) nanospheres are synthesized by multi-step method. Composite photoanodes and Dye-sensitized solar cells (DSSCs) with different amount of HSAT nanospheres are studied. The study indicates that the HSAT nanospheres have enhanced the scattering and absorption of incident light in the photoanode, reduced the interface transmission resistance, increased the electron lifetime, and thus significantly improved performance of DSSCs. The maximal Jsc and photoelectric conversion efficiency (PCE) obtained in the optimal DSSC doped with HSAT of 3.0% are 15.83 mA cm?2 and 7.21%, greatly enhanced by 21.0% and 20.4%, respectively, compared with those of the pure TiO2-based DSSC. These remarkable enhancements in DSSCs performance can be attributed to the synergistic and complementary effects of the localized surface plasmon resonance and strong light scattering of HSAT nanospheres, which has significantly improved the absorption and utilization on incident light and thus the PCE of the DSSCs. Such synergistic and complementary effects of the different functions are also likely expected to play roles in the performance improvements in other solar cells.
关键词： scattering enhancement,localized surface plasmon resonance,composite photoanodes,dye-sensitized solar cells,multi-shell hollow structure
更新于2025-09-19 17:13:59
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Improved photovoltaic performance of dye-sensitized solar cells by Au-ion implantation of titania film electrodes
摘要： Plasmonic metal nanoparticles are known to work as light-harvesting antennae and to enhance photocurrents of photovoltaic cells. Therefore, in this work, the effect of gold (Au) ions distribution on the efficiency of dye sensitized solar cells (DSSCs) has been investigated. Thin films of TiO2 have been deposited on FTO glass substrates by the doctor tape method. Au ions were then implanted on these films with different fluence rates (i.e., 2 × 1014, 4 × 1014 and 6 × 1014 ions/cm2). XRD results confirmed that TiO2 is present in the anatase phase up to a 4 × 104 ions/cm2 fluence rate. At a 6 × 1014 ions/cm2 fluence rate, one peak of rutile is obtained which confirmed that the film has mixed phases of TiO2. UV results show that dye is adsorbed into all photoanodes. Maximum dye absorption is seen at a fluence rate of 4 × 1014 ions/cm2. The energy conversion efficiency of DSSC is highly dependent on the fluence rate of Au. At a fluence rate of 4 × 1014 ions/cm2, the cell has a high short circuit current density (JSC) of 7.21 mA/cm2, resulting in a high efficiency (×) of 2.92%. Impedance spectroscopy shows that the cell formed by Au ions fluence rate of 4 × 1014 ions/cm2 has a low recombination rate of electron/hole pairs.
关键词： Impedance spectroscopy,Ions implantation,Au,TiO2,Dye-sensitized solar cells
更新于2025-09-19 17:13:59
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Fusing Thienyl with N-Annulated Perylene Dyes and Photovoltaic Parameters for Dye-Sensitized Solar Cells
摘要： Due to the role of dye in dye-sensitized solar cells (DSSCs), design novel dye sensitizer is effective strategy to improve power conversion efficiency. To this end, the fundamental issue is the understanding sensitizer’s trilateral relationship among molecular structure, optoelectronic properties and photovoltaic performance. Here, on the one hand, to investigate the relationship between molecular structure and properties, considering the good performance of N-annulated perlyene dye sensitizers, the geometries, electronic structures and excitations of the selected representative organic dye sensitizers C276, C277, C278 and the dyes adsorbed on TiO2 clusters were calculated. It is found that, fusing thienyl to N-annulated perlyene can elevate the highest occupied molecular orbital (HOMO) energies, reduce orbital energy gap, increase density of states, expand HOMO to benzothiadiazole moiety, enhance charge transfer excitation, elongate fluorescence lifetime, amplify light harvesting efficiency and induce red-shift of absorption spectra. The transition configurations and molecular orbitals of dye adsorbed systems support that the electron injection in DSSCs based on these dyes are fast mode. On the other hand, to exposure the relationship between properties and performance, based upon extensive analysis of electronic structures and excitation properties of these dye sensitizers and the dye adsorbed systems, we present new quantities as open-circuit voltage and short-circuit current density descriptors, which celebrate the quantitative bridge between the photovoltaic parameters and the electronic structure related properties. The results of this work are critical for design novel dye sensitizers for solar cells.
关键词： electronic structures,N-annulated perylene dyes,photovoltaic parameters,dye-sensitized solar cells,excitation properties
更新于2025-09-19 17:13:59
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Rational Design of Phenothiazine-Based Organic Dyes for Dye-Sensitized Solar Cells: The Influence of ??-Spacers and Intermolecular Aggregation on Their Photovoltaic Performances
摘要： Power conversion efficiency (PCE) is one of the important factors in influencing the overall performance of dye-sensitized solar cells (DSSCs), and precise prediction of PCE is a feasible strategy for preparing highly-efficient DSSCs devices. In this work, we designed a series of phenothiazine-based organic dyes by introducing different π-spacers including the 4-isopropyl-4H-dithieno[3,2-b:2′,3′-d]pyrrole (DTP) and 2,7-dihydronaphtho[1,2-d:5,6-d']diimidazole (NDI) to tune their photovoltaic properties. The present studies reveal that the PCE value of the DTP-based dye is estimated to 8.55%, in excellent agreement with the experimentally available value (8.19%) observed in the reported analogue. In comparison to DTP, the strong electron-deficiency NDI group induces a remarkable red-shifting of maximum absorption band, broadening the optical absorption into the near-infrared region. As a consequence, the NDI-based dye achieves an impressive PCE value of 15.51%, which is expected to be a potential organic dye applied in DSSCs.
关键词： Intermolecular aggregation,Phenothiazine-based organic dyes,π-spacers,Photovoltaic performances,Dye-sensitized solar cells
更新于2025-09-19 17:13:59