研究目的
To enhance the DSSC performance by improving harvesting solar light through co-sensitization of porphyrin dye (LD12) and an organic dye (D149).
研究成果
The co-sensitization of porphyrin and organic dyes with complementary spectral absorption and high molecular packing density on TiO2 electrode improves the photocurrent and enhances the power conversion efficiency compared with individual sensitizers. The stepwise sensitization approach is effective for achieving highly efficient panchromatic dye-sensitized solar cells.
研究不足
The competitive adsorption between the D149 and the LD12 dyes in the cocktail approach reduces adsorption of the LD12 sensitizer on the TiO2 electrode. The stepwise approach was found to be more effective in maximizing the adsorption of the LD12 dye.
1：Experimental Design and Method Selection:
The study employed co-sensitization of porphyrin dye (LD12) and an organic dye (D149) to improve light harvesting efficiency in DSSCs. Two approaches were used: one-step cocktail method and stepwise method.
2：Sample Selection and Data Sources:
The dyes LD12 and D149 were selected for their complementary absorption spectra. LD12 was synthesized according to literature methods, and D149 was purchased from Sigma-Aldrich.
3：List of Experimental Equipment and Materials:
UV–Vis spectrometers (SPECORD S-600 and Shimsdzu-2100), NMR spectroscopy (Bruker Avance II 300 MHz), Ultra-Sonic (Sonics VC-750), FT-IR spectroscopy (Thermo Nicolet Nexus 870 Ftir ESP FT-IR Spectrometer), solar simulator (PROVA 8300), IV Tracer (Sharif Solar IV-25), and a homemade IPCE instrument.
4：Experimental Procedures and Operational Workflow:
The photoanode was prepared by immersing in dye solutions with optimized times for dye loading. Two methods were used: one-step cocktail method with different molar ratios and stepwise method with sequential immersion in LD12 and D149 solutions.
5：Data Analysis Methods:
The performance of the co-sensitized solar cells was evaluated by measuring photovoltaic parameters under standard AM 1.5 illumination and analyzing IPCE spectra.
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UV–Vis spectrometer
SPECORD S-600
Used for absorption spectra measurement
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UV–Vis spectrometer
Shimsdzu-2100
Used for absorption spectra measurement
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NMR spectroscopy
Bruker Avance II 300 MHz
Used for structural analysis
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Ultra-Sonic
Sonics VC-750
Used for sample preparation
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FT-IR spectroscopy
Thermo Nicolet Nexus 870 Ftir ESP FT-IR Spectrometer
Used for structural analysis
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Solar simulator
PROVA 8300
Used for photovoltaic performance measurement
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IV Tracer
Sharif Solar IV-25
Used for photovoltaic performance measurement
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D149 dye
Sigma-Aldrich
Used as co-sensitizer in DSSCs
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