研究目的
Investigating the effect of interfacial modification of the photoanode|electrolyte interface using oleic acid (OA) on the performance of dye-sensitized solar cells (DSSCs), focusing on eliminating the VOC–JSC trade-off and improving photoconversion efficiency.
研究成果
Interfacial modification of the photoanode|electrolyte interface with oleic acid significantly improves the photoconversion efficiency of DSSCs by eliminating the VOC–JSC trade-off, enhancing charge transfer kinetics, and reducing charge recombination. This approach offers a promising pathway for optimizing DSSC performance.
研究不足
The study focuses on a specific dye (C106) and modifier (oleic acid), which may limit the generalizability of the findings to other dye-modifier systems. The experimental conditions, such as light intensity and electrolyte composition, were fixed, potentially overlooking variations in performance under different conditions.
1：Experimental Design and Method Selection
The study involved the fabrication of DSSCs with and without OA modification to the TiO2 photoanode. The methodology included UV-vis DRS and UPS analysis for optical and electronic characterization, Mott–Schottky analysis for flat band potential determination, and electrochemical impedance spectroscopy for charge transport kinetics.
2：Sample Selection and Data Sources
TiO2 (P25) was used as the photoanode material, with C106 dye as the sensitizer. Oleic acid was used for interfacial modification. The electrolyte consisted of a redox couple in an organic solvent mixture.
3：List of Experimental Equipment and Materials
UV-VIS-NIR spectrophotometer (Cary 5000, Varian), FT-IR spectrometer (TENSOR 27, Brucker), spectrofluorometer (FP-8500, JASCO), potentiostat–galvanostat (SP-150, Bio-logic), solar simulator (Sciencetech-AAA), Keithley-2400 voltage meter, ESCALAB 250 Xi (Thermo Scientific) for UPS measurements.
4：Experimental Procedures and Operational Workflow
Fabrication of DSSCs involved coating TiO2 on FTO glasses, dye sensitization, OA modification, and assembly with a platinum counter electrode. Photovoltaic performance was tested under simulated sunlight. Electrochemical and spectroscopic analyses were conducted to study the effects of OA modification.
5：Data Analysis Methods
Data from J–V curves, EIS, Mott–Schottky analysis, and UPS were analyzed to determine photovoltaic parameters, charge recombination resistance, electron lifetime, and work function changes.
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