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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） ▾

  • Influence of Calcination Temperature on the Performance of TiO<sub>2</sub> Films in Dye-Sensitized Solar Cells

    摘要： In this work, the effects of calcination temperature on the photovoltaic performance of TiO2 films prepared with non-hydrolytic sol-gel method were reported. The optimal photovoltaic performance of DSCs was obtained by annealing TiO2 film at 550 °C. The short-circuit current (Jsc), open-circuit voltage, fill factor (FF) and energy conversion efficiency were 15.68 mA·cm-2, 0.71 V, 0.62 and 6.83%, respectively.

    关键词： dye-sensitized solar cell,photoanode film,performance,calcination temperature,non-hydrolytic sol-gel titanium dioxide

    更新于2025-09-16 10:30:52

  • Role of Modifying Photoanodes by Organic Titanium on Charge Collection Efficiency Enhancement in Dye‐Sensitized Solar Cells

    摘要： Mesoporous TiO2 photoanodes are prepared by an electrophoretic deposition (EPD) method and applied in dye-sensitized solar cells (DSSCs). Pretreating an F-doped SnO2 coated glass (FTO) substrate and post-treating a TiO2 film to introduce an anatase TiO2 layer on the FTO and the TiO2 film, respectively, can greatly improve the power conversion efficiency (PCE) of a DSSC, which constitutes up 31% improvement compared with the untreated device. To disclose the mechanism for improvement, scanning electron microscopy, electrochemical impedance spectroscopy, open-circuit voltage decay, and photoluminescence spectra are investigated. It is proposed that the preformed compact TiO2 layer can suppress the back recombination by preventing direct contact between the electrolyte and the FTO substrate. Moreover, the compact TiO2 layer can reduce contact resistance between FTO and TiO2 particles. Further increased PCE by post-treatment is attributed to the promoted charge transfer efficiency. Both pre- and post-treating strategies can offer a reference to enhance the PCE for other porous film-based DSSCs, as well as promote the application of EPD in DSSCs.

    关键词： photoanodes,anatase TiO2 layers,dye-sensitized solar cells,modify

    更新于2025-09-16 10:30:52

  • Application of Polyoxometalate-Ionic Liquids (POM-ILs) in Dye-Sensitized Solar Cells (DSSCs)

    摘要： Polyoxometalates (POMs) as anionic metal oxides are promising candidates for application in dye-sensitized solar cells (DSSCs) due to their peculiar properties including a reversible and multi-electron redox behavior. In this work, four polyoxometalate as ionic liquids (POM-ILs) based on the combination between phosphomolybdate anion (PMo12O40 3-) and organic cations such as [BMIM]+, [BPy]+, [HDPy]+ and [P6,6,6,14]+ were prepared and characterized. A detailed chemical structural elucidation by elemental analysis, ATR-FTIR, 1H and 31P NMR spectroscopies have been performed. These POM-ILs were tested as photosensitizers by adsorption to the photoanode (TiO2 film) for different times (15 minutes to 17 hours). The DSSCs performance can be highly improved comparing the commercially available compound and POM-ILs. The electrodeposition process is an excellent alternative to adsorption in order to improve the overall efficiencies. In general, [BPy]3[PMo12O40] and [P6,6,6,14]3[PMo12O40] are the most promissory compounds for DSSC approaches.

    关键词： Dye-Sensitized Solar Cells,Electrodeposition,Ionic Liquids,Polyoxometalate,Energy Conversion Efficiency

    更新于2025-09-16 10:30:52

  • Effective Preparation of Nanoscale CH <sub/>3</sub> NH <sub/>3</sub> PbI <sub/>3</sub> Perovskite Photosensitizers for Mesoporous TiO <sub/>2</sub> ‐Based Solar Cells by Successive Precursor Layer Adsorption and Reaction (SPLAR) Process

    摘要： Nanoscale CH3NH3PbI3 perovskite sensitizers are grown step-by-step by delivering each precursor successively onto the surface of mesoporous (meso) TiO2 electrode. Using Pb(NO3)2 ions as a lead(II) source and CH3NH3I (MAI) for methylammonium and iodide sources, repetitive cycles of the two dipping steps are successful in growing few nanometer-sized MAPbI3 gradually on the TiO2 surface inside the meso-TiO2 film. However, some aggregates are observed on the top-surface of meso-TiO2 film due to slight dissolution of PbI2 and its accumulation/reaction with MAI at the top-surface of meso-TiO2 film. To solve this inhomogeneity during the course of the deposition, a nondestructive multiple deposition route for nanoscale MAPbI3 is suggested as a successive precursor layer adsorption and reaction (SPLAR) process where, from the second cycle of deposition, PbI2 is delivered with the help of an ionic liquid compound dissolved in dichloromethane. With this new Pb-precursor in less-polar solvents by spin-coating process, nanoscale MAPbI3-sensitizers are grown step-by-step without dissolution of pre-formed perovskites back to PbI2 or formation of some aggregates at the top-surface. After the third cycle of SPLAR deposition, about 7.0 nm-size MAPbI3-sensitizers are prepared and they display enhanced photovoltaic performance (7.18± 0.31 %) compared to devices obtained from only one cycle (5.74± 0.30 %).

    关键词： solid-state dye-sensitized solar cells,nanoscale perovskite,successive adsorption and reaction,photosensitizer

    更新于2025-09-16 10:30:52

  • Investigation of triphenylamine-based sensitizer characteristics and adsorption behavior onto ZnTiO3 perovskite (101) surfaces for dye-sensitized solar cells using first-principle calculation

    摘要： Four different Triphenylamine-based dyes, named as TPA-1, TPA-2, TPA-3 and TPA-4 as shown below, with substituents containing different linkages, earlier described inTiO2dye-sensitized solar cells(DSSCs), are described. The dyes are examined as potential dyes for perovskite ZnTiO3 based dye sensitized solar cells (DSSCs). The simulated characteristics include: Electronic absorption spectra, light harvesting efficiency, energy of dye adsorption to the semiconductor ZnTiO3 electrode, energy level alignment and spontaneity of charge transfer across the dye interfaces with ZnTiO3 and with solution redox couple. The characteristics have been comparatively investigated for all dyes. The absorption spectra for each dye, in its free and adsorbed forms, are discussed. Energy levels and electrochemical parameters are investigated to assess electron transfer efficiency between the excited dyes and the ZnTiO3 particles. Among the series, the dye TPA-3 shows superior behaviors, in terms of spontaneity of charge transfer with ZnTiO3 conduction band. The dye exhibits bidentate mode bonding with the semiconductor surface (101) as evidenced from its high adsorption energy. Such bonding enables stronger adherence between the dye and the semiconductor and enables more efficient charge transfer. The results encourage more theoretical and experimental study on TPA-3@ZnTiO3 DSSCs, with promising conversion efficiency and stability.

    关键词： Dye-sensitized solar cells,DFT,Electronic absorption spectra,ZnTiO3 perovskite,Triphenylamine-based dyes

    更新于2025-09-16 10:30:52

  • Microwave assisted synthesis of CuInGaSe2 quantum dots and spray deposition of their composites with graphene oxide derivatives

    摘要： In this contribution, we explore a spray deposition technique to prepare thin films based on nanocomposites of graphene oxide (GO) or reduced graphene oxide (rGO) with CuInGaSe2 quantum dots (QD) synthesized by a microwave-assisted method. Small nanocrystals in the tetragonal phase and emitting light at 650 nm were obtained. Water-based solutions of the nanocomposites were sprayed onto transparent conductive glass substrates using an automated ultrasonic spray system and the resulting thin films were evaluated with respect to their morphological and electrochemical properties. The distribution and organization of the graphene sheets in the composites were affected by the interaction between the nanocrystals and GO or rGO, which also interfered on the electronic properties. In addition, we demonstrated a possible application of the thin film based on the rGO-QD composite as a counter electrode in dye-sensitized solar cells.

    关键词： copper indium gallium selenide,dye-sensitized solar cell,graphene oxide,microwave assisted synthesis,spray deposition,reduced graphene oxide

    更新于2025-09-16 10:30:52

  • Direct comparison of dithienosilole and dithienogermole as π-conjugated linkers in photosensitizers for dye-sensitized solar cells

    摘要： Dithienosilole (DTS) and dithienogermole (DTG) are useful building units of π-conjugated organic materials. In the present work, donor–π-acceptor (D–π-A) dyes with bis(dihexyloxyphenyl)aminophenyl, DTS or DTG, and pyridine or cyanoacrylic acid as the donor (D), the π-conjugated linker (π), and the acceptor (A) units, respectively, were prepared and their optical properties were investigated. The D–π-A dyes exhibited strong absorption in the visible region, indicating efficient intramolecular donor–acceptor interaction. The addition of trifluoroacetic acid to solutions of pyridine-containing dyes led to red-shifts of the absorption bands as a result of pyridinium salt formation. Similar red-shifts were observed for cyanoacrylic acid dyes, which were due to the enhanced formation of neutral dyes relative to the separated ion pairs. The D–π-A dyes, however, showed similar absorption spectra when attached to the TiO2 surface, indicating that the dye–TiO2 electronic interaction was rather weak. In contrast to the finding that these dyes exhibited similar optical properties regardless of the π-linker (i.e., DTS or DTG), dye-sensitized solar cells (DSSCs) based on DTG-containing dyes exhibited superior performance compared to those based on DTS-containing dyes. Electrochemical impedance spectroscopy measurements supported the higher performance of the DSSCs with DTG-containing dyes.

    关键词： π-conjugated linkers,Dithienosilole,Dithienogermole,Dye-sensitized solar cells,Photosensitizers

    更新于2025-09-16 10:30:52

  • Dye-sensitized solar cells using fluorone-based ionic liquids with improved cell efficiency

    摘要： Dye-sensitized solar cells using fluorone-based ionic liquids with improved cell efficiency. Six trihexyltetradecylphosphonium chloride (P6,6,6,14Cl) based ionic liquids (IL) with dianionic fluorone derivatives were synthesized with total exchange of chloride from the dianionic dye: Fluorescein (a), Rose Bengal (b), Phloxine B (c), Eosin B (d), Eosin Y (e) and Erythrosin B (f). Spectroscopic characterization of these viscous salts indicated the presence of the expected 1 or 2 strong absorption bands. A total of 12 compounds, as sodium (from a to f) or as trihexyltetradecylphosphonium dianion salts (from a0 to f0), were used for sensitization of nanocrystalline TiO2. Here, we report the sensitization activity of these metal free dyes in terms of current–potential curve, open-circuit potential, fill factor, and overall solar energy conversion efficiency which have been evaluated under 100 mW cm?2 light intensity. We developed a strategy to improve the light harvesting of these conventional dyes by simple cationic exchange which was accompanied by a minimum of 30% increase in the cell photovoltaic conversion efficiency. Also, for Eosin B the binding to TiO2 apparently allows reduction of the –NO2 electron-withdrawing group to –NO2?. This provides a new interaction between the reduced nitro group and the TiO2 surface, reflecting an improvement in the overall DSSC performance reaching its maximum of 0.65% efficiency after light DSSC soaking. Factors that improve DSSC performance like aggregate inhibition, increment of the electrode's quasi-Fermi level and slight red shift in the absorption spectra of the tested anionic dyes were achieved by simple cationic exchange.

    关键词： TiO2 sensitization,Cationic exchange,Photovoltaic conversion efficiency,Fluorone-based ionic liquids,Dye-sensitized solar cells

    更新于2025-09-16 10:30:52

  • Role of long persistence phosphors on their enhancement in performances of photoelectric devices: in case of dye-sensitized solar cells

    摘要： To enhancing enhanced sunlight harvesting, long persistence phosphor (LPP) materials were often incorporated into photoanodes of photoelectric devices. However, the role of LPP layer on the photoelectric enhancements is not yet clear. Here, the authors have systematically studied the effect of green LPP (SrAl2O4: Eu3+) and its thickness on photoelectric behaviours of dye-sensitized solar cells (DSSCs). Results showed that the P25/LPP DSSCs generates power conversion efficiency (PCE) of 7.16 % at the optimal LPP thickness, which is 24.3% higher than that of the P25 ones. Series of analysis indicate that the enhancements in short-circuit current density and PCE could mainly be due to the LPP’s function of back scattering (containing down-conversion effect and enhancement in light absorption) of incident sunlight. Moreover, the enhanced carriers’ lifetime and open-circuit voltage are mainly due to the LPP layer’s afterglow effect. In addition, the P25/LPP DSSCs can still generate an output power density (82.15 μW cm-2) with a high PCE value of 46.94% in dark.

    关键词： Back scattering,Power conversion efficiency,Down conversion,Long persistence phosphors,Titanium dioxide (P25),Dye-sensitized solar cells

    更新于2025-09-16 10:30:52

  • Platinum counter electrodes for dye-sensitized solar cells prepared by one-step dipping process

    摘要： When designing counter electrodes (CEs) to enhance the performance of dye-sensitized solar cells (DSSCs), facile routes are important features. Platinum (Pt) metal is one of the most-promising CE designs for DSSCs. Herein, we developed a simple, and cost-effective one-step dipping process for preparing Pt CEs in DSSCs. The Pt CEs were prepared by dipping fluorine-doped tin oxide (FTO) in a 3-mercaptopropyl triethoxysilane (MTS)-Pt suspension. We tested and compared MTS-1-Pt, MTS-10-Pt, and sputtered-Pt as CEs in DSSCs. MTS-1-Pt and MTS-10-Pt refer to samples prepared with 1 and 10 ml of MTS, respectively. DSSCs with MTS-1-Pt CEs exhibited power conversion efficiency (PCE) values as high as 8.28%, which was superior to the DSSCs using MTS-10-Pt as the CEs (1.61%). Additionally, the DSSCs with MTS-1-Pt CE showed mostly similar PCEs compared to those with sputtered-Pt (8.55%) because of the same catalytic activity with iodide. Thus, this modified Pt CE facile process can be used to further enhance the performance of DSSCs.

    关键词： one-step dipping process,catalytic activity,power conversion efficiency,Platinum counter electrodes,dye-sensitized solar cells

    更新于2025-09-16 10:30:52