修车大队一品楼qm论坛51一品茶楼论坛,栖凤楼品茶全国楼凤app软件 ,栖凤阁全国论坛入口,广州百花丛bhc论坛杭州百花坊妃子阁

oe1(光电查) - 科学论文

过滤筛选

出版时间
  • 2019
研究主题
  • Dye-sensitized solar cell
  • Photoelectrode
  • Light scattering layer
  • Transmittance
  • White pigment (R902+)
  • Rutile titanium dioxide
应用领域
  • Optoelectronic Information Materials and Devices
机构单位
  • Tribhuvan University
352 条数据
?? 中文（中国） ▾

  • 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

  • A Novel Single-Atom Electrocatalyst Ti <sub/>1</sub> /rGO for Efficient Cathodic Reduction in Hybrid Photovoltaics

    摘要： Single-atom catalysts (SACs) are a frontier research topic in the catalysis community. Carbon materials decorated with atomically dispersed Ti are theoretically predicted with many attractive applications. However, such material has not been achieved so far. Herein, a Ti-based SAC, consisting of isolated Ti anchored by oxygen atoms on reduced graphene oxide (rGO) (termed as Ti1/rGO), is successfully synthesized. The structure of Ti1/rGO is characterized by high-angle annular dark-field scanning transmission electron microscopy and X-ray absorption fine structure spectroscopy, being determined to have a five coordinated local structure TiO5. When serving as non-Pt cathode material in dye-sensitized solar cells (DSCs), Ti1/rGO exhibits high electrocatalytic activity toward the tri-iodide reduction reaction. The power conversion efficiency of DSCs based on Ti1/rGO is comparable to that using conventional Pt cathode. The unique structure of TiO5 moieties and the crucial role of atomically dispersed Ti in Ti1/rGO are well understood by experiments and density functional theory calculations. This emerging material shows potential applications in energy conversion and storage devices.

    关键词： reduced graphene oxide,titanium,single-atom catalysts,dye-sensitized solar cells,cathode reaction

    更新于2025-09-23 15:21:01

  • Theoretical study of Da??Aa?2a????a??A/Da????a??Aa?2a????a??A triphenylamine and quinoline derivatives as sensitizers for dye-sensitized solar cells

    摘要： We have designed four dyes based on D–A0–p–A/D–p–A0–p–A triphenylamine and quinoline derivatives for dye-sensitized solar cells (DSSCs) and studied their optoelectronic properties as well as the e?ects of the introduction of alkoxy groups and thiophene group on these properties. The geometries, single point energy, charge population, electrostatic potential (ESP) distribution, dipole moments, frontier molecular orbitals (FMOs) and HOMO–LUMO energy gaps of the dyes were discussed to study the electronic properties of dyes based on density functional theory (DFT). And the absorption spectra, light harvesting e?ciency (LHE), hole–electron distribution, charge transfer amount from HOMO to LUMO (QCT), D index, HCT index, Sm index and exciton binding energy (Ecoul) were discussed to investigate the optical and charge-transfer properties of dyes by time-dependent density functional theory (TD-DFT). The calculated results show that all the dyes follow the energy level matching principle and have broadened absorption bands at visible region. Besides, the introduction of alkoxy groups into triarylamine donors and thiophene groups into conjugated bridges can obviously improve the stability and optoelectronic properties of dyes. It is shown that the dye D4, which has had alkoxy groups as well as thiophene groups introduced and possesses a D–p–A0–p–A con?guration, has the optimal optoelectronic properties and can be used as an ideal dye sensitizer.

    关键词： alkoxy groups,thiophene group,density functional theory,dye-sensitized solar cells,D–A0–p–A/D–p–A0–p–A,triphenylamine,quinoline derivatives,time-dependent density functional theory,optoelectronic properties

    更新于2025-09-23 15:21:01

  • Dye-sensitized solar cell based on poly(?μ-caprolactone) gel polymer electrolyte and cobalt selenide counter electrode

    摘要： In this work, gel-like polymer electrolytes were prepared by incorporating poly(ε-caprolactone) (PCL) into dimethylformamide (DMF)-potassium iodide (KI) liquid electrolytes. The optimized gel polymer electrolyte has the composition of 40 wt.% of PCL, 45 wt.% of DMF and 15 wt.% of KI with a conductivity of 2.72 × 10?3 S cm?1 at room temperature. Increase in conductivity with temperature is attributed to the increase in diffusion coefficient, D, number, n and mobility, μ of ions as determined from Nyquist plots fitting. Cobalt selenide (CoSe) was prepared by hydrothermal method and used as counter electrode catalysts in dye-sensitized solar cells (DSSCs). X-ray diffraction (XRD) studies show the formation of the as-prepared CoSe. The morphology and stoichiometric composition of CoSe were studied by field-emission scanning electron microscopy (FESEM) and energy dispersive X-ray spectroscopy (EDX). The PCL-DMF-KI gel polymer electrolytes were assembled into DSSCs with CoSe or platinum (Pt) as the counter electrodes. DSSC with CoSe counter electrode shows an efficiency of 6.74% while DSSC with Pt counter electrode yields an efficiency of 6.99%. Impedance studies of DSSCs suggest that the electrocatalytic reduction of triiodide, I3 ? by the CoSe is as good as Pt.

    关键词： CoSe,PCL,Counter electrode,Gel polymer electrolyte,Dye-sensitized solar cells

    更新于2025-09-23 15:21:01