研究目的
To enhance the performance of dye-sensitized solar cells (DSSCs) by modifying the titanium dioxide (TiO2) photoanode with plasmonic gold (Au) nanoparticles.
研究成果
The incorporation of Au nanoparticles into TiO2 photoanodes enhanced the performance of N3 DSSCs with liquid electrolyte, achieving an efficiency increase from 4.16% to 6.97% at an optimum Au concentration of 40 μl. The improvement was primarily due to increased Jsc resulting from enhanced light absorption and scattering by Au nanoparticles. However, performance deteriorated beyond the optimum Au concentration due to decreased dye absorption and electron injection efficiency.
研究不足
The study found that exceeding the optimum concentration of Au nanoparticles (40 μl) led to a decrease in DSSC performance due to reduced dye absorption and inefficient electron injection from dye to TiO2. The work function of noble metal nanoparticles being lower than the conduction band of TiO2 also caused electron recombination with triiodide ions in the electrolyte.
1：Experimental Design and Method Selection:
The study focused on modifying TiO2 photoanodes in DSSCs by incorporating different concentrations of Au nanoparticles to enhance performance. The J-V characteristics were measured under white light intensity of 100 mW cm-2 to determine the optimum concentration of Au nanoparticles.
2：Sample Selection and Data Sources:
The materials used included P90 and P25 titanium dioxide (TiO2), triton X-100, carbowax, gold (Au) nanoparticles (5 nm diameter), acetone, nitric acid, fluorine-doped tin oxide (FTO) glass, iodolyte Z-50, platinum (Pt) solution, and N3 dye.
3：List of Experimental Equipment and Materials:
Equipment used included a solar simulator (Newport Oriel LCS-100) for J-V characteristics and an AUT 85988 advanced electrochemical system (Metrohm Autolab B.V. PGSTAT 128N Netherlands) for impedance measurements.
4：Experimental Procedures and Operational Workflow:
The DSSC fabrication involved coating two layers of TiO2 on FTO substrate, incorporating Au nanoparticles into the TiO2 mesoporous layer, and assembling the DSSC with liquid electrolyte. The DSSCs were characterized under a solar simulator to obtain J-V characteristics and impedance measurements.
5：Data Analysis Methods:
The energy conversion efficiency (η) was calculated using the Jsc, Voc, FF, and Pin. Impedance data were analyzed using an equivalent circuit model to understand the charge transfer and recombination processes.
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