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Multi-cycle Growth of Boron Doped ZnO Films as Photoanode for Dye-Sensitized Solar Cell (DSSC)
摘要： The work is concerned with the fabrication of dye sensitized solar cell (DSSC) utilizing multi-layer boron doped ZnO nanorods films. The B-doped ZnO films were prepared on FTO glass substrate via seed mediated hydrothermal method. Multi-layer B-doped ZnO nanorods were obtained by immersing the sample into a growth solution and repeated the growth process at 90 oC for 30 minutes. The structure of the B-doped ZnO film has been found to exhibit the hexagonal wurtzite structure. The length and diameter of the nanorods increase with the number of the growth cycle. The performance of the DSSC fabricated using the multi-layer B-doped ZnO nanorod was found to be significantly higher than that of the DSSC based on the single layer ZnO nanorod arrays. The best photovoltaic parameters with the JSC of 3.5 mA cm-2, FF of 0.38 and η of 0.67%, respectively was obtained for the device utilizing the layer with 3 cycles since it possesses the lowest photoluminescence in visible region and lowest Rct.
关键词： nanorod,boron,dye-sensitized solar cell,ZnO,hydrothermal
更新于2025-09-23 15:21:01
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An all-solid-state lamellar-nanostructured polymer electrolyte in-situ-prepared from smectic liquid crystal for thermally stable dye-sensitized solar cells
摘要： A novel all-solid-state polymer electrolyte based on thiolate/disulfide redox couple was in-situ prepared from a lamellar-assembled liquid crystal precursor for dye-sensitized solar cells (DSSCs). The use of the thiolate/disulfide redox couple allowed the in-situ polymerization, which ensured both preservation of the lamellar nanostructure in electrolyte and sufficient interfacial contact in DSSC. Electrochemical analysis revealed that the lamellar-nanostructured electrolyte possessed charge transport ability and photovoltaic performance quite close to the liquid crystal electrolyte precursor. The resultant all-solid-state DSSCs showed a thermally stable photovoltaic performance with PCE higher than 2% from 35 to 90 °C. The method in using in-situ polymerization of nanostructured liquid crystals to prepare solid-state electrolytes shed a new light for efficient and stable all-solid-state DSSC preparation, especially in large-scale actual application.
关键词： All-solid-state polymer electrolyte,In-situ preparation,Smectic liquid crystal,Dye-sensitized solar cell
更新于2025-09-23 15:21:01
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The influence of bilateral environment of dyed-TiO2/electrolyte interface on detailed recombination process during the a??maturea?? period of sensitized solar cell
摘要： The complete dye-sensitized solar cell (DSC) life cycle includes three stages: “mature” period, stability period and degradation period. However, during the DSC performance adjustment period, considering the in?uence of both sides of the dyed-TiO2/electrolyte interface on the electron recombination process is still blank. In this paper, the effects of the environment on both sides of the interface between TiO2 and electrolyte during the DSC performance adjustment on the electron recombination process are studied. The results show that the performance adjustment of DSC is greatly in?uenced by the chemical environment of electrolyte. The ?lm microstructures have a certain in?uence on the electron recombination process during the performance adjustment. During the performance adjustment period of DSC, the adjustment of quasi-Fermi level is more complicated under the condition of weak light than under the condition of strong light. The results of this paper are signi?cant for studying complex systems of DSC, understanding the device working mechanism and improving the cell ef?ciency.
关键词： Performance adjustment period,Electron recombination,TiO2 ?lm,Dye-sensitized solar cell,Electrolyte
更新于2025-09-23 15:21:01
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Preparation of NiO/TiO2 Composite Films for Enhanced Dye Sensitized Solar Cell Efficiency
摘要： Spray pyrolysis technique has been applied for preparing many kinds of thin films because this technique offers a lot of advantages, such as inexpensive cost, uncomplicated process and large scale production. Therefore, the spray pyrolysis technique is used for making pure TiO2 and NiO/TiO2 composite films in this report. A NiO/TiO2 composite film is getting attention to be used as a compact layer in dye sensitized solar cell (DSSC) because NiO can be used as a hole collector and a barrier for energy recombination properties. Moreover, the NiO/TiO2 composite film exhibits superhydrophilic properties that can increase absorption efficiency for a dye solution. This study has an objective to improve the efficiency of DSSC by changing the ratio of NiO/TiO2 in the composite films. The pure TiO2 and NiO/TiO2 composite films were prepared at 200℃ by spray pyrolysis technique using a Ti(OCH(CH3)2)4 solution and a mixture of Ti(OCH(CH3)2)4 solution with Ni(NO3)2?6H2O powder, respectively. The effect of the ratio between Ni(NO3)2?6H2O powder and Ti(OCH(CH3)2)4 solution (0.5 atm%, 1 atm%, 2 atm%, and 4 atm% of Ni(NO3)2?6H2O) on the efficiency of DSSCs were studied. The surface morphology, crystal structure and optical properties of TiO2 and NiO/TiO2 composite films on FTO and glass substrates were characterized by using field-emission scanning electron microscope (FE-SEM), X-ray diffractometer (XRD), and UV-VIS spectrophotometer, respectively. The FE – SEM images showed that the films were smooth surface and dense when prepared at 200 ℃. The XRD results of TiO2 and NiO/TiO2 composite films on the FTO substrates showed that the TiO2 crystals were anatase phase because the peak at 25.30 corresponds to (101) planes of anatase. The spectrophotometer results showed that the optical transmittance for all samples were about 80%. For the energy conversion efficiency characterization, it was found that the NiO/TiO2 composite films that were prepared from 0.5 atm% of Ni(NO3)2?6H2O solution had the better energy conversion efficiency than TiO2 films.
关键词： NiO/TiO2 composite film,Dye sensitized solar cell,Spray pyrolysis technique
更新于2025-09-23 15:21:01
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Synthesis of a novel MoIn2S4 alloy film as efficient electrocatalyst for dye-sensitized solar cell
摘要： A petal-like MoIn2S4 thin film with excellent performance was synthesized on conductive fluorine-doped tin oxide (FTO) substrate through the hydrothermal method. The MoIn2S4 thin film with 0.169 g InCl3 exhibited the most excellent electrocatalytic activity and lowest charge transfer resistance of 19.90 Ω cm?1 among the various MoIn2S4 samples in I?/I3? redox couple, which was confirmed through a series of electrochemical investigations. The photoelectric conversion efficiency for the DSSC served the MoIn2S4 thin film as counter electrode achieved 6.51% under 100 mW·cm?2 illumination, which was a little better than that of the DSSC assembled with the Pt (6.39%) electrode. This research demonstrates that the petal-like MoIn2S4 counter electrode with simple preparation process, excellent electrocatalytic activity and efficient photoelectric conversion efficiency is a promising alternative to the conventional Pt electrode in DSSCs.
关键词： MoIn2S4,Efficient conversion efficiency,Counter electrode,Dye-sensitized solar cell
更新于2025-09-23 15:21:01
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Fabrication and performance analysis of a low cost, Pt free counter electrode using carbon coated ZnAl layered double hydroxide (C/ZnAl-LDH) for dye sensitized solar cells
摘要： Carbon based material represents an e?ective substitute for Pt counter electrodes (CEs) in Dye Sensitized Solar Cells (DSSCs). This study introduces a novel carbon coated ZnAl layered double hydroxides (C/ZnAl-LDH) can be utilised as an e?ective CE in DSSCs. C/ZnAl-LDH was synthesised by the pyrolysis of ZnAl-LDH using glucose solution. The synthesised C/ZnAl-LDH was characterised using TEM, SEM, XRD and BET analysis. The surface roughness of both Pt and C/ZnAl-LDH ?lms were analysed using AFM spectroscopy. C/ZnAl-LDH slurry was pasted uniformly using doctor blade technique onto FTO glass substrate. The electrochemical measurements such as Cyclic Voltammetry (CV), Electrochemical Impedance Spectroscopy (EIS) and Tafel polarization recommends that C/ZnAl-LDH can be used as a CE due to its good reduction rate of ?I3 comparable with Pt CEs. The photovoltaic parameters were observed to be 0.66 V and 11.97 mA/cm2 for open circuit voltage V(oc) and short circuit current density J(sc) respectively for C/ZnAl-LDH CE. The assembled cell with C/ZnAl LDH CE having power conversion e?ciency (PCE) of 3.18% is comparable to Pt CE having 4.62% which is measured under the similar testing conditions.
关键词： Dye Sensitized Solar Cell,Carbon based material,Counter electrode,Layered double hydroxides,Electrochemical parameters
更新于2025-09-23 15:21:01
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Photovoltaic Performance of Porphyrina??Based Dyea??Sensitized Solar Cells with Binary Ionic Liquid Electrolytes
摘要： Here, we studied a green porphyrin sensitizer Y350 based dye-sensitized solar cells with binary ionic liquid based electrolytes, which are a mixture of 1-methyl-3-propyl-imidazolium iodide with 1-methyl-1-butylpyrrolidinium bis(trifluromethylsulfonyl)-imide, 1-butylpyridinium bis(trifluromethylsulfonyl)imide, 1-methyl-3-ethylimidazolium bis(trifluromethylsulfonyl)imide or 1-methyl-3-ethylimidazolium tetracyanoborate.The best semi-transparent green DSC device exhibited a short-circuit current density of 9.1 mA cm-2, an open-circuit voltage of 727 mV and a fill factor of 70%, corresponding to an overall power conversion efficiency (PCE) of 4.9 % under standard AM 1.5G illuminations at 100 mW cm-2. The PCE increased to 6.1 % with opaque films containing larger light scattering TiO2 particles.
关键词： Dye-sensitized solar cell,Photovoltaics,Porphyrin dye,Organic dye,Ionic liquid electrolyte
更新于2025-09-23 15:19:57
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Photocurrent enhancement by incorporation of air-stable Cs <sub/>2</sub> SnI <sub/>6</sub> Perovskite in dye-sensitized solar cell
摘要： Cs2SnI6 is an inorganic lead-free perovskite variant which is air and thermal stable and its application in the third generation of photovoltaic devices is undergoing rapid expansion over the past few years. This paper presents a fabrication of dye-sensitized solar cell (DSSC) with the incorporation of Cs2SnI6 perovskite in the active layer of N-719 dye. The absorbance spectra of N-719 dye on TiO2 mesoporous layer is found to increase by the addition of 2 wt% and 3 wt% of Cs2SnI6 in N719 dye in comparison to the reference of N-719 dye leading the role of Cs2SnI6 as photon absorber in the devices. Our fabricated DSSC device reveals a photocurrent enhancement from 6.36 mA/cm2 to 12.87 mA/cm2 by the addition of 3 wt% of Cs2SnI6, along with the enhancement of power conversion efficiency from 1.71% to 3.94%.
关键词： Cs2SnI6,perovskite,dye-sensitized solar cell,N-719 dye,photocurrent enhancement
更新于2025-09-23 15:19:57
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Direct dynamic evidence of charge separation in a dyea??sensitized solar cell under operando conditions by Raman spectroscopy
摘要： Interfaces play an important role in enhancing the energy conversion performance of dye-sensitized solar cells (DSCs). The interface effects have been studied by many techniques, but almost all studies only performed on a portion of DSC, rather than on a complete solar cell. Hence, monitoring the interface evolution of a DSC is still very challenging. Here, in situ/operando resonance Raman (RR) spectroscopic analyses were carried out to monitor the dynamic observations of the photovoltaic conversion process from a DSC. We observed the creation of new species (i.e., polyiodide and iodine aggregates) in the photosensitization process. We also successfully identified molecular-scale dynamic evidence that the bands from the C═C of 2,2’-bipyridyl (bpy), the S═C═N of NCS ligand and photochemical products show reasonably strong intensity and frequency changes, which clearly demonstrates that they are important pathways of charge separation. Furthermore, RR spectroscopy also be applicable to quickly evaluate the performance of DSCs.
关键词： dye-sensitized solar cell,semiconductor,TiO2 nanotube array,Raman spectroscopy,charge transfer
更新于2025-09-23 15:19:57
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Enhanced Power Conversion Efficiency of Dye-Sensitized Solar Cells by Band Edge Shift of TiO2 Photoanode
摘要： By simple soaking titanium dioxide (TiO2) films in an aqueous Na2S solution, we could prepare surface-modified photoanodes for application to dye-sensitized solar cells (DSSCs). An improvement in both the open-circuit voltage (Voc) and the fill factor (FF) was observed in the DSSC with the 5 min-soaked photoanode, compared with those of the control cell without any modification. The UV–visible absorbance spectra, UPS valence band spectra, and dark current measurements revealed that the Na2S modification led to the formation of anions on the TiO2 surface, and thereby shifted the conduction band edge of TiO2 in the negative (upward) direction, inducing an increase of 29 mV in the Voc. It was also found that the increased FF value in the surface-treated device was attributed to an elevation in the shunt resistance.
关键词： surface modification,conduction band edge shift,dye-sensitized solar cell,sodium sulfide
更新于2025-09-23 15:19:57