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oe1(光电查) - 科学论文

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  • Monodispersed Nickel Phosphide Nanocrystals In Situ Grown on Reduced Graphene Oxide with Controllable Size and Composition as Counter Electrode for Dye-Sensitized Solar Cells

    摘要： Owing to their abundance, low cost and excellent functional properties and catalytic activity, transition metal phosphides (TMPs) have been proposed in a broad range of energy conversion technologies. However, their challenging synthesis and moderate electrical conductivity has limited their implementation in real applications. Here, we detail a simple procedure to grow fully dispersed nickel phosphide nanocrystals (NCs) with controlled size, phase and composition on the surface of reduced graphene oxide (rGO). The resultant NixPy/rGO composites effectively combine a huge density of catalytic active sites from NixPy with the excellent conductivity of rGO, thus exhibiting highly improved electrocatalytic activities. NixPy/rGO composites were tested as counter electrode (CE) in dye sensitized solar cells (DSSCs), providing significantly improved performance over conventional Pt-based CEs. The incorporation of CEs based on Ni12P5/rGO composites allowed reaching power conversion efficiency up to 8.19%, well above those of DSSCs based Pt CEs (7.87%). According to DFT calculations, the outstanding electrocatalytic activity of Ni12P5/rGO as CE in DSSCs was associated with the exceptional I3ˉ adsorption capacity. These results prove that Ni12P5/rGO is a promising candidate to replace Pt as CE in DSSCs.

    关键词： Reduced graphene oxide,Dye-sensitized solar cells,Nickel phosphide,Electrocatalytic activity,Monodispersed

    更新于2025-09-23 15:21:01

  • Osmium sensitizer with enhanced spin-orbit coupling for panchromatic dye-sensitized solar cells

    摘要： Low-lying triplet metal-to-ligand charge transfer (3MLCT) transitions of osmium complexes induced by spin-orbit coupling (SOC) is promising to extend photocurrent response when applied to dye-sensitized solar cells. In this study, we present a newly designed osmium complex (coded CYC-33O), incorporating a 2-thiohexyl-3,4-ethylenedioxythiophene functionalized bipyridyl ancillary ligand to red-shift the absorption and enhance the absorbance of both singlet and triplet MLCT transitions. Time-dependent density functional theory (TDDFT) calculations clearly signify the reinforced 1MLCT and 3MLCT transitions of CYC-33O mainly originate from osmium to 4,4',4"-tricarboxy-2,2':6',2"-terpyridine anchoring ligand, advantaging the heterogeneous electron transfer between CYC-33O and TiO2. The device sensitized with CYC-33O exhibits the panchromatic conversion beyond 1000 nm, yielding the photocurrent density of 19.38 mA cm–2 which is much higher than those of the cells based on the ruthenium analogue (CYC-33R) and model osmium complex (Os-3) sensitizers.

    关键词： dye-sensitized solar cell,triplet metal-to-ligand charge transfer (3MLCT),ruthenium complex,spin-orbit coupling (SOC),osmium complex,time-dependent density functional theory (TDDFT)

    更新于2025-09-23 15:21:01

  • Efficient Cu/rGO/TiO2 nanocomposite-based photoanode for highly-optimized plasmonic dye-sensitized solar cells

    摘要： Renewable energy resources play a valuable role in the global increase of energy demand. The research was performed to enhance the performance of plasmonic dye-sensitized solar cells (PDSSCs) by harvesting the maximum sunlight. In this context, the TiO2 nanoparticles for simple DSSCs and the Cu/rGO/TiO2 nanocomposites for PDSSCs were synthesized using the Sol–Gel and chemical reduction method. Authors demonstrated the utilization of synthesized Cu/rGO/TiO2 nanocomposite-based photoanode to fabricate the plasmonic dye-sensitized solar cells (PDSSCs). SEM, EDX, XRD, and UV/Vis techniques were employed to analyze the surface morphology, elemental composition, crystal structure, and absorbance spectra, respectively. Furthermore, IV measurements were performed on the fabricated devices, and it was observed that the Cu/rGO/TiO2 nanocomposite presented an enhanced efficiency of 5.14% in PDSSCs, which is more than that of the DSSCs-based on pure TiO2 nanoparticles. As an enhanced efficiency could be achieved by high optical absorption and electron injection rate, the PDSSCs with Cu/rGO/TiO2 nanocomposite have an enhanced efficiency due to the surface plasmonic resonance. An improved IPCE of 59.79% was also achieved in Cu/rGO/TiO2 nanocomposite-based photoanode, which might be due to the higher surface area of the photoanode.

    关键词： Plasmonic dye-sensitized solar cells,Cu/rGO/TiO2 nanocomposite,Surface plasmonic resonance

    更新于2025-09-23 15:21:01

  • Enhanced Photosensitization by Carbon Dots Co-adsorbing with Dye on p-Type Semiconductor (Nickel Oxide) Solar Cells

    摘要： In this work, the effect of carbon dots (C-dots) on the performance of NiO-based dye-sensitized solar cells (DSSCs) was explored. NiO nanoparticles (NPs) with a rectangular shape (average size: 11.4 x 16.5 nm) were mixed with C-dots, which were synthesized from citric acid (CA) and ethylenediamine (EDA). A photocathode consisting of a composite of C-dots with NiO NPs (NiO@C-dots) was then used to measure the photovoltaic performance of a DSSC. A power conversion efficiency (PCE) of 9.85 % (430 nm LED@50 mWcm-2) was achieved by a DSSC fabricated via the adsorption of N719 sensitizer with a C-dot content of 12.5 wt% at a 1.5:1 EDA:CA molar ratio. This PCE value was far larger than the PCE value (2.44 or 0.152 %) obtained for a NiO DSSC prepared without the addition of C-dots or N719, respectively, indicating the synergetic effect by the co-adsorption of C-dots and N719. This synergetically higher PCE of the NiO@C-dots-based DSSC was due to the larger amount of sensitizer adsorbed onto the composites with a larger specific surface area and the faster charge transfer in the NiO@C-dots working electrode. In addition, the C-dots bound onto the NiO NPs shorten the bandgap of the NiO NPs due to energy transfer and give rise to faster charge separation in the electrode. The most important fact is that C-dots are the main sensitizer and N719 tightly adsorbed on C-dots and NiO behaves as an accelerator of a positive electron transfer and a restrainer of the electron-hole recombination. These results reveal that C-dots are a remarkable enhancer for NiO NPs in DSSCs, and that NiO@C-dots are the promising photovoltaic-electrode materials for DSSCs.

    关键词： dye-sensitized solar cell,power conversion efficiency,nickel oxide@carbon dots composite,Nickel oxide,carbon dot

    更新于2025-09-23 15:21:01

  • Enhanced efficiency in dye-sensitized solar cell by localized surface plasmon resonance effect of gold nanoparticles

    摘要： Strong localized surface plasmon resonance (LSPR) ˉeld, which is generated from gold nanoparticles, may enhance photons absorption of dyes in dye-sensitized solar cells (DSSCs), resulting in the improvement of their power conversion e±ciency (PCE). In this paper, we report the incorporation of oleylamine capped gold nanoparticles (AuOA NPs) into the N-719 dye layer in DSSCs. The cells were prepared by varying the weight percentage of AuOA NPs with respect to the dye weight in dye solutions. The dye solutions containing 1.44 wt.%, 1.92 wt.% and 2.4 wt.% of AuOA NPs exhibited an enhancement in their absorption spectra in the UV-Visible range, which may be the result of the excitation of localized SPR. The J (cid:1) V characteristics of those DSSCs show an enhancement in their photocurrent along with their PCE, from 4.18% to 5.14% for the cells made from the dye solutions without AuOA and with addition of 2.4 wt.% of AuOA, respectively. This improvement is due to the enhancement of light absorption and hence charge carrier generation by the Plasmonic wave generated by AuOA NPs through the LSPR phenomenon.

    关键词： gold nanoparticles,impedance spectroscopy,localized surface plasmon resonance,J (cid:1) V characteristics,Dye-sensitized solar cells

    更新于2025-09-23 15:21:01

  • Density Functional Theory Study on the Donating Strength of Donor Systems in Dye-Sensitized Solar Cells

    摘要： The electron-donating strength of donor (D) moieties in thirteen donor-π-acceptor systems (D1-π-A to D13-π-A wherein -π- and A represent butadiene and cyanoacrylic acid units, respectively) have been studied using B3LYP/cc-pVDZ level density functional theory (DFT) calculations. The selected D moieties are encountered as a part of an organic sensitizer molecule in dye-sensitized solar cell (DSSC) applications. When D moiety is joined with π-A, a certain amount of electron donation from D to A occurs leading to increase in electron density at the A site of D-π-A compared to A site of π-A. This electron reorganization is quantified in terms of the change in molecular electrostatic potential (MESP) minimum (ΔVmA) at the acceptor site, the CN group of the cyanoacrylic acid. The ΔVmA is always negative, in the range -11.0 to -2.6 kcal/mol which provides a quick assessment of the rank order of the electron-donating nature of the D moieties in the ground state of D-π-A. The optical, and photovoltaic properties of D and D-π-A systems are also determined at TD-CAM-B3LYP/cc-pVDZ//B3LYP/cc-pVDZ level. An absorption red shift (Δλmax) in the range 81 – 242 nm is observed when D moieties change to D-π-A systems. The ground state property ΔVmA showed a strong linear correlation with the excited state property Δλmax. Further, ΔVmA is found to be proportional to the open-circuit voltage (Voc). The resemblance of highest occupied molecular orbital (HOMO) and lowest unoccupied molecular orbital (LUMO) energies of the D-π–A system with the respective energies of donor and π-A systems shows that donor tunes HOMO, while π-A tunes LUMO. Among the thirteen D-π-A systems, N,N-dialkylaniline, and julolidine are rated as the best donors for the photovoltaic applications. This study shows that MESP based assessment of donating strength of donor systems offers a powerful rational design strategy for the development of efficient dyes for DSSC applications.

    关键词： donor-π-acceptor systems,electron-donating strength,molecular electrostatic potential,dye-sensitized solar cells,density functional theory

    更新于2025-09-23 15:21:01

  • Improving performance of ZnO flexible dye sensitized solar cell by incorporation of graphene oxide

    摘要： At today great interest has been paid to hydrogen production by water electrolysis due to their simplicity and low cost. Dye sensitized solar cell are promising devices as renewable electrical power source to achieve water electrolysis because they possess high theoretical ef?ciency compared with Si based solar cells. In this research, ZnO photo catalyst was modi?ed with graphene oxide (GO) by means of high energy milling. The anode of the ?exible dye-sensitized solar cell was fabricated by electrophoretic deposition of the photo catalyst onto ?exible electrodes. The obtained materials were characterized by FTIR, XRD, XPS and SEM–EDS. The ef?ciency and ?ll factor of ZnO and ZnO–GO cells were estimated from the I–V curve, measured under simulated sunlight. The obtained results demonstrate that ZnO–GO cell have higher ef?ciency compared with the ZnO cell. The latter can be explained by the better dispersion of ZnO that enlace the dye adsorption onto the fabricated anode and by the presence of GO that improve the absorption of photons from the light.

    关键词： flexible solar cells,dye sensitized solar cell,graphene oxide,ZnO,electrophoretic deposition

    更新于2025-09-23 15:21:01

  • Effect of energy band misalignment and morphology in In <sub/>2</sub> O <sub/>3</sub> -CNTs on electron transport in dye-sensitized solar cell

    摘要： This study provides important insights in performance degradation of In2O3-MWCNTs (0.4 and 0.5 wt.%)-based dye-sensitized solar cell (DSSC) using chemical-bath deposition technique. In2O3-MWCNTs (0.4 wt.%) exhibited the highest power conversion efficiency of 0.312% with low electron recombination rate, keff of 1256.72 s?1, and faster electron lifetime, seff of 0.80 ms compared to In2O3-MWCNTs (0.5 wt.%). The energy band misalignment between the conduction band of In2O3 photoanode and FTO caused severe electron recombination in In2O3-MWCNTs (0.5 wt.%). Therefore, this study can be used as a benchmark of 0.4 wt.% as the optimum concentration of MWCNTs in In2O3 for DSSC.

    关键词： electron transport,optical,dye-sensitized solar cells,Chemical-bath deposition,In2O3-CNTs

    更新于2025-09-23 15:21:01

  • Pusha??Pull Zinc Phthalocyanine Bearing Hexa-Tertiary Substituted Carbazolyl Donor Groups for Dye-Sensitized Solar Cells

    摘要： An asymmetrical, push–pull phthalocyanine bearing bulky tert-butylcarbazolyl moieties as electron donor and carboxylic acid as anchoring group was synthetized and tested as a photosensitizer in dye-sensitized solar cells (DSSC). The new photosensitizer was characterized by 1H and 13C NMR, UV–Vis and mass spectrometry. The bulky tert-butylcarbazolyl moieties avoid the aggregation of the phthalocyanine dye. DFT studies indicate that the HOMO is delocalized throughout the π-electron system of the substituted phthalocyanine and the LUMO is located on the core of the molecule with a sizable electron density distribution on carboxyl groups. The new dye has been used as a photosensitizer in transparent and opaque dye-sensitized solar cells, which exhibit poor e?ciencies related to a low Jsc.

    关键词： A3B,Zn(II) phthalocyanine,dye-sensitized solar cells,DSSC

    更新于2025-09-23 15:21:01

  • Fabrication of Ag nanoparticles adhered on RGO based on both electrodes in dye-sensitized solar cells (DSSCs)

    摘要： The electrode plays an important role in dye-sensitized solar cells (DSSCs). Preparation of the electrode should be simple and should result in high performance of its DSSC. We herein demonstrated high-performance and easily prepared Silver nanoparticles adhered on Reduced graphene oxide–Platinum composites (Ag–RGO/Pt) as counter electrodes (CEs) and TiO2 on RGO sheets with Ag (TiO2–RGO/Ag) as photoanode (PE) in DSSCs. The 1:2 Ag–RGO/Pt CE and 0.5% TiO2–RGO/Ag PE showed an overall highest power conversion efficiency of 9.15% under (1.5 AM) solar irradiation. The optimal weight ratio of Ag:RGO:Pt materials was also examined. Moreover, we showed that incorporation of Ag nanoparticles into the counter electrode successfully improved interfacial charge transfer resulting in high electrocatalytic activity for the reduction of triiodide to iodide redox, which in turn could enhance the performance of the DSSCs.

    关键词： Counter electrode,Silver,Reduced graphene oxide,Dye-sensitized solar cells

    更新于2025-09-23 15:21:01