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oe1(光电查) - 科学论文

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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） ▾

  • 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

  • A Self-Assembled Chromophore/Catalyst Bilayer for Water Oxidation in a Dye-Sensitized Photoelectrosynthesis Cell

    摘要： A new approach is described here for the preparation of water oxidation photoanodes in a Dye-Sensitized Photoelectrosynthesis Cell (DSPEC) for water splitting. It is based on a chromophore (C) - catalyst (Cat) assembly prepared by a self-assembled bilayer (SAB) on a mesoporous SnO2/TiO2 core/shell electrode, FTO| SnO2/TiO2|-C-Cat. A key feature in the resulting assembly is the in-situ “synthesis” by utilization of non-covalent interactions between long alkyl substituents of the chromophore and catalyst components. The photoanode carries out photoelectrochemical water oxidation for more than 3 hours with ~ 86% faradaic efficiency for oxygen generation. At pH 7 under 1 sun illumination, the photoanode reaches a photocurrent density of ~2.2 mA/cm2 with an incident photon to current efficiency (IPCE) of 29% at 450 nm. With an injection yield of only ~ 42%, the efficiency of the cell, excluding the losses at the core/shell interface, is a remarkable 67 %.

    关键词： water oxidation,photoelectrochemical,chromophore-catalyst assembly,dye-sensitized photoelectrosynthesis cell,self-assembled bilayer

    更新于2025-09-19 17:13:59

  • Light scattering effect of polyvinyl-alcohol/titanium dioxide nanofibers in the dye-sensitized solar cell

    摘要： In the present work, polyvinyl-alcohol/titanium dioxide (PVA/TiO2) nanofibers are utilized as a light scattering layer (LSL) on top of the TiO2 nanoparticles photoanode. The TiO2 nanoparticles decorated PVA/TiO2 nanofibers display a power conversion efficiency (PCE) of 4.06%, which is 33% higher than tio2 nanoparticles without LSL, demonstrating the incorporation of PVA/TiO2 nanofibers as LSL reduces the radiation loss and increases the excitation of the electron that leads to high PCE. The incorporation of PVA/TiO2 nanofibers as LSL also increases the electron life time and charge collection efficiency in comparison to the TiO2 nanoparticles without LSL.

    关键词： power conversion efficiency,dye-sensitized solar cell,PVA/TiO2 nanofibers,light scattering layer,electron life time

    更新于2025-09-19 17:13:59

  • 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

  • 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

  • Phenothiazine dyes containing a 4-phenyl-2-(thiophen-2-yl) thiazole bridge for dye-sensitized solar cells

    摘要： Two novel phenothiazine dyes bearing a single or double cyanoacrylic acid acceptors, which share the same electron donor phenothiazine and the same 4-phenyl-2-(thiophen-2-yl)thiazole p-bridge, were synthesized. Thus, phenothiazine dyes with D-p-A and A-D-p-A framework were con?gured, and their photophysical properties and photovoltaic performance were investigated. The incorporation of another cyanoacrylic acid acceptor was found to bene?t the loading amount on TiO2, the light-harvesting ability, and the electron-injection ef?ciency. Dye with double cyanoacrylic acid acceptors showed a double short-circuit current compared with dye with a single acceptor. Therefore, dye with double cyanoacrylic acid acceptors achieved improved photoelectric conversion ef?ciency 4.35% (JSC ? 10.29 mA cm?2, VOC ? 0.65 V, FF ? 0.65) under standard global AM 1.5 G solar condition with dye N719 (7.19%) as a reference.

    关键词： Phenothiazine,Photovoltaic performance,4-Phenyl-2-(thiophen-2-yl)thiazole,Double acceptors,Dye-sensitized solar cell

    更新于2025-09-19 17:13:59

  • Synthesis of Low‐Viscosity Ionic Liquids for Application in Dye‐Sensitized Solar Cells

    摘要： Two types of ionic liquids (ILs), 1-(3-hexenyl)-3-methyl imidazolium iodide and 1-(3-butenyl)-3-methyl imidazolium iodide, are synthesized by introducing an unsaturated bond into the side alkyl chain of the imidazolium cation. These new ionic liquids exhibit high thermal stability and low viscosity (104 cP and 80 cP, respectively). The molecular dynamics simulation shows that the double bond introduced in the alkane chain greatly changes the molecular system space arrangement and diminishes the packing efficiency, leading to low viscosity. The low viscosity of the synthesized ionic liquids would enhance the diffusion of redox couples. This enhancement is detected by fabricating dye-sensitized solar cells (DSSCs) with electrolytes containing the two ILs and I2. The highest efficiency of DSSCs is 6.85 % for 1-(3-hexenyl)-3-methyl imidazolium iodide and 5.93 % for 1-(3-butenyl)-3-methyl imidazolium iodide electrolyte, which is much higher than that of 5.17 % with the counterpart 1-hexyl-3-methyl imidazolium iodide electrolyte.

    关键词： dye-sensitized solar cell,viscosity,electrolyte,ionic liquid

    更新于2025-09-19 17:13:59

  • 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

  • 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

  • High Efficiency Dye Sensitized Solar Cell from <i>Tectona Grandis</i> and red <i>Crysanthemum Morifolium</i> as a Sensitizer

    摘要： Tectona Grandis leaves and red Crysanthemum Morifolium have been used as sensitizers for dye sensitized solar cell (DSSC) using organic solvents by ethanol, citric acid, and distilled water in respectively with the ratio of 5 : 1 : 4. TiO2 paste was spin-coated on top Indium Tin Oxide (ITO) conductive glass and calcinated at temperature of 450oC for 10 min. The chemical properties were analysis by using Fourier transform infrared spectroscopy (FTIR) indicated the presence of anthocyanin from Tectona Grandis leaves and red Crysanthemum Morifolium petal. The physical properties were analysis by using UV-Vis spectrophotometer was performed to measure the absorbance of dye solution in the visible spectrum range and X-Ray Diffractometer (XRD) was used to determine the structure of TiO2/ITO and Dye/TiO2/ITO. Among the three dyes studied, the mixed dye solution from Tectona Grandis leaves and red Crysanthemum Morifolium was shows the best photosensitization effects with the conversion efficiency is 0.834 %.

    关键词： sensitizer,red Crysanthemum Morifolium,Tectona Grandis,Dye Sensitized Solar Cell,anthocyanin

    更新于2025-09-19 17:13:59