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N719 Derivatives for Application in a Dye-Sensitized Solar Cell (DSSC): A Theoretical Study
摘要： The primary goal of this investigation is to analyze the influence of the chemical modifications on the electronic structures of N719 derivatives for their use in Dye-Sensitized Solar Cells (DSSC), by employing Density Functional Theory (DFT). UV-Visible spectra indicate that the electronic configurations are essential to study the absorption of solar irradiation and to analyze the charge transport mechanism between the Electron Transport Layer (ETL), the electrolyte, and the dye. Open and closed-shell electronic configurations are related to the absorption and the excitation energies of the dye. According to the results reported here, it is possible to say that the best candidates are N719, N719-2, N719-7, and N719-8 (neutral and di-anionic). They may be used as useful dye sensitizers due to their bandgap and band alignment with the ETL, which contributes to having an effective charge transport during the functioning of the solar device. Another parameter that is reported in this investigation is the Light-Harvesting Efficiency (LHE) for all studied systems. This could help to improve the performance of the device since there is an increment in the generation of charge carriers. These results could be useful as a guide for experimental investigations on chemical modifications of these sensitizers.
关键词： UV-Visible Spectra,Light-Harvesting Efficiency,Molecular Structure,Spectroscopy,DFT,N719 Derivatives,Theoretical Study,Quantum Chemistry,Density Functional Theory,DSSC,Dye-Sensitized Solar Cell,LHE
更新于2025-09-12 10:27:22
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ThCr2Si2-type quaternary chalcogenides as efficient Pt-free counter electrodes for dye-sensitized solar cells
摘要： Two quaternary chalcogenides of ThCr2Si2-type K2FeCu3Q4 (Q for S and Se) were utilized as new type of Pt-free counter electrodes (CEs) for dye-sensitized solar cells (DSSCs). The X-ray photoelectron spectroscopy (XPS), Mott-Schottky analysis, cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS) were performed to clarify the differences in energy band alignments, electrocatalytic and photovoltaic performances. A photoelectric conversion efficiency (PCE) of 5.07% was achieved in DSSCs assembled with K2FeCu3Se4 CE, which was obviously superior to that of K2FeCu3S4 CE (3.42%) and comparable with that of Pt CE (6.25%) under one sun AM 1.5 G illumination (100 mW cm-2). Compared to K2FeCu3S4 CE, the higher PCE of K2FeCu3Se4 CE can be attributed to the better catalytic activity for I3- reduction, stronger driving force for electron injection from CE to electrolyte, faster electron transfer and electrolyte diffusion channels.
关键词： ThCr2Si2-type structure,Counter electrode,Quaternary chalcogenides,Dye-sensitized solar cell,Pt-free
更新于2025-09-12 10:27:22
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A study nanocrystalline TiO 2 based on dye sensitized solar cells with quasi solid state electrolytes
摘要： A quasi solid state electrolytes can be done by adding potassium iodide (KI) and iodine (I2) into quasi solid state electrolytes. Consisting 1,2,4,5–tetrakisbromomethyl benzene (TB), ? –butyrolactone (GBL), propylene carbonate (PC), and ethylene carbonate (EC) gelated with sample 1, 2, 3 and 4. Potassium iodide salt poorly soluble in liquid electrolyte, but can dissolve completely in quasi solid state electrolytes. The dye sensitized solar cell (DSSCs) with the quasi solid state electrolytes were fabricated. The results showed that the energy conversion efficiency of light to electricity were 0.052 %, 0.126 %, 0.121 % and 0.125 %., respectively, under irradiation of 80 mW/cm2. The performance of the dye sensitized solar cell with quasi solid state electrolytes is more stable than that of liquid electrolytes.
关键词： TiO2,dye sensitized solar cell,potassium iodide,iodide salts,quasi solid state electrolytes,energy conversion efficiency
更新于2025-09-12 10:27:22
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Role of Clathrin Protein to Increase Electric Current on Dye-Sensitized Solar Cell (DSSC) Based Natural Dyes
摘要： Dye-Sensitized Solar Cell (DSSC) has the cost of fabrication is relatively cheap, easy to produce, work on the area of the visible light and environmentally friendly. The shortage of DSSC, namely the efficiency is still low compared with solar cells of silicon. In this study, have been successfully fabricated DSSC with clathrin protein deposited. The method used in this research is to deposit clathrin protein in porous TiO2 semiconductors with a concentration of 0%, 25%, 50%, and 75%. Tests carried out on the DSSC that has been made current testing electricity using a solar simulator to determine the changes in electrical current that occur in DSSC. The conclusion from this research is that with increasing concentration of the addition of the clathrin protein in the DSSC leads to an increase in the electric current generated by DSSC. From the results of testing using a solar simulator obtained the value of electric current is the highest, namely 5.247 mA with the addition of the concentration of the clathrin protein by 75%.
关键词： electric current,Dye-Sensitized Solar Cell,TiO2,clathrin protein,DSSC
更新于2025-09-12 10:27:22
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Design of new Imidazole-derivative dye having donor-Π-acceptor moieties for highly efficient organic-dye-sensitized solar cells
摘要： In the present work, we have synthesised donors/acceptor substituted derivative of imidazole 4-(1-(3-chloro-4-nitrophenyl)-4,5-diphenyl-1H-imidazol-2-yl)benzoic acid (CNI) via one-pot synthetic method and has been characterized by spectroscopic methods such as IR, SEM and EDX. The photophysical properties like, solvatochromic shift and quantum yield of the CNI dye were found to be 1.85% and 0.57 respectively. The increase in absorbance and decrease in fluorescence spectra with different concentrations of TiO2 nanoparticles confirmed the possibility of interactions between dye and TiO2 nanoparticles. The Rehm-Weller relation suggests that, decrease in fluorescence of CNI dye was due to photo-induced electron transfer process and the Stern-Volmer studies suggest that, the fluorescence quenching mechanism was due to combined dynamic and static quenching process. The theoretical and experimental methods. Further, photosensitization of TiO2 nanoparticles from CNI dye has been investigated using absorption, steady state and time resolved fluorescence methods. Photovoltaic energy conversion efficiency and fill factor of fabricating CNI dye sensitized solar cell.
关键词： Dye sensitized solar cell (DSSC),TiO2 nanoparticles,Photo induced Electron transfer,Fluorescence quenching,Imidazoles derivatives
更新于2025-09-12 10:27:22
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Rational design of SM315-based porphyrin sensitizers for highly efficient dye-sensitized solar cells: A theoretical study
摘要： To explore high-efficiency dye-sensitized solar cells (DSSCs), five D-π-A type porphyrin dyes derived from SM315 synthesized by Gr?tzel et al with electron-rich units D1-D5 as donors were investigated using density functional theory (DFT) and time-dependent density functional theory (TD-DFT). The enhanced light harvesting abilities of all designed dyes are reflected by widened light harvesting efficiency curves, extended absorption spectra to near-infrared region and ~84 nm red-shifted maximum absorption wavelengths as well as double increased oscillator strengths. Mainly contributed by the remarkable increment of predicted short-circuit current density, the predicted overall efficiency of the design dyes increases by ~27% compared to SM315. Especially, S101 could be the most promising candidate with the highest predicted overall efficiency of 16.7% among all of dyes. The dynamic simulations of interfacial electron transfer of all the investigated dyes expound that the excited electrons inject almost totally into semiconductor TiO2 within 200 fs. This work would provide guidance for exploring potential sensitizers in highly efficient DSSCs.
关键词： porphyrin sensitizer,interfacial electron transfer,power-conversion efficiency,dye-sensitized solar cell
更新于2025-09-12 10:27:22
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Laser-scribed reduced graphene oxide as counter electrode for dye-sensitized solar cell
摘要： Reduced graphene oxide (rGO) has been attracted considerable attention in the field of dye sensitized solar cells (DSSCs) to serve as a low cost and earth-abundant alternative to the conventional platinum-based counter electrodes. Recently direct laser writing technologies are emerging as an inexpensive, time-efficient and high-resolution method to produce catalytic rGO-based electrodes. Herein, we experimentally demonstrate that the laser-scribed rGO on ITO/PEN substrate was produced by a commercial LightScribe DVD burner and used as counter electrode for DSSC. SEM and Raman spectroscopy characterizations reveal that after laser-scribing rGO film presents a roughness structure with multi-layer curled or tilting graphenes. The cyclic voltammetry (CV) and electrochemical impedance spectrum (EIS) analyses were also conducted to explore its electrocatalytic activity and charge-transfer properties. Finally, the DSSC based on rGO counter electrode achieved a power conversion efficiency of 2.07% under one sun AM 1.5 G illumination. This work developed a simple and promising laser-scribing method to prepare rGO-based counter electrode materials for DSSCs applications.
关键词： dye-sensitized solar cell,laser-scribing,Reduced graphene oxide,counter electrode
更新于2025-09-12 10:27:22
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Interfacial Engineering in Functional Materials for Dye‐Sensitized Solar Cells || Function of Photoanode: Charge Transfer Dynamics, Challenges, and Alternative Strategies
摘要： The increase in population demanded heavy energy requirements that accelerated the depletion of fossil fuels [1]. Among several renewable resource-based alternatives, dye-sensitized solar cell (DSSC) is one of the cost-effective and potential substitutes to silicon solar cells that emerged in the early 1990s in the field of photovoltaics, as it involves inexpensive components and simple fabrication process. DSSC is entirely different from the conventional p/n junction solar cells in terms of operating principle; however, it adopts the principle of natural photosynthesis process and, therefore, is it is often addressed as artificial photosynthesis. The monolayer of dye molecules on the photoanode functions like chlorophyll in plants and absorbs the incident light to generate both positive and negative charge carriers in the cell.
关键词： photoanode,dye-sensitized solar cell,charge transfer dynamics,renewable energy,DSSC
更新于2025-09-12 10:27:22
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There Is a Future for N-Heterocyclic Carbene Iron(II) Dyes in Dye-Sensitized Solar Cells: Improving Performance through Changes in the Electrolyte
摘要： By systematic tuning of the components of the electrolyte, the performances of dye-sensitized solar cells (DSCs) with an N-heterocyclic carbene iron(II) dye have been significantly improved. The beneficial effects of an increased Li+ ion concentration in the electrolyte lead to photoconversion efficiencies (PCEs) up to 0.66% for fully masked cells (representing 11.8% relative to 100% set for N719) and an external quantum efficiency maximum (EQEmax) up to approximately 25% due to an increased short-circuit current density (JSC). A study of the effects of varying the length of the alkyl chain in 1-alkyl-3-methylimidazolium iodide ionic liquids (ILs) shows that a longer chain results in an increase in JSC with an overall efficiency up to 0.61% (10.9% relative to N719 set at 100%) on going from n-methyl to n-butyl chain, although an n-hexyl chain leads to no further gain in PCE. The results of electrochemical impedance spectroscopy (EIS) support the trends in JSC and open-circuit voltage (VOC) parameters. A change in the counterion from I? to [BF4]? for 1-propyl-3-methylimidazolium iodide ionic liquid leads to DSCs with a remarkably high JSC value for an N-heterocyclic carbene iron(II) dye of 4.90 mA cm?2, but a low VOC of 244 mV. Our investigations have shown that an increased concentration of Li+ in combination with an optimized alkyl chain length in the 1-alkyl-3-methylimidazolium iodide IL in the electrolyte leads to iron(II)-sensitized DSC performances comparable with those of containing some copper(I)-based dyes.
关键词： N-heterocyclic carbene,iron,dye-sensitized solar cell,ionic liquid,lithium ion,electrolyte
更新于2025-09-12 10:27:22
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Lily (Iris Persica) pigments as new sensitizer and TiO2 nanofibers as photoanode electrode in Dye Sensitized Solar Cells
摘要： In this study, lily (Iris Persica) dyes as sensitizer were examined by UV-Vis and FTIR analyses. Corresponding results showed that lily pigments effectively absorb incident light. This was mainly due to the presence of functional groups such as C=O and O-H in the pigment structure appeared on the FTIR analysis. This shows the appropriateness of lily pigment as sensitizer. On the other hand, anatase TiO2 nanofibers with different diameters were synthesized by Electrospinning method, using Titanium isopropoxide (TIPP) and polyvinylpyrrolidone (PVP) solution. The Electrospinning feed rate was altered from 0.1 to 0.5 mL/h to control the diameter of the TiO2 nanofibers. Other effective parameters including voltage, needle tip distance to collector and speed of collector were 25 kV, 15 cm and 500 rpm, respectively and were kept constant during synthesizing of nanofibers. The Synthesized nanofibers were analyzed and characterized by means of SEM, FESEM, XRD and TEM techniques. The FESEM and XRD analyses indicated that the nanofiber's diameter and crystallinity increase with increase in feed rate. The fabricated DSSC with 430nm TiO2 nanofibers (obtained from flow rate of 0.3mL/h) provided 1.72% energy conversion efficiency (? ), 50.78% conversion efficiency of photon to electron (IPCE), short-circuit current density (JSC) of 2.716 mA/cm2 and open circuit voltage (VOC) of 0.738V. The efficiency of the developed DSSCs, in comparison with the previously fabricated similar cells, were found higher, due to more effective absorption of light by the dyes and adsorption of pigment by nanofibers.
关键词： TiO2 nanofibers,wild lily dyes,Dye sensitized solar cell (DSSC),electrospinning
更新于2025-09-12 10:27:22