研究目的
Investigating the enhancement of photovoltaic performance in dye sensitized solar cells (DSSCs) by incorporating hydrothermal processed molybdenum disulfide (MoS2) into the bulk of titanium dioxide (TiO2) nanoparticle film.
研究成果
Incorporating hydrothermal processed heterogeneous MoS2 into the bulk TiO2 nanoparticle film improves the photovoltaic performance of DSSCs by facilitating charge transport. An optimum weight fraction of MoS2 (0.09%) in TiO2 was found to enhance the performance by 17%. This study suggests new methods to facilitate charge transport in surface states dominated electron acceptors such as TiO2.
研究不足
The study did not use any special surface treatment, for example TiCl4, which might have further improved the performance. The manual mixing of hydrothermal processed MoS2 layers with TiO2 nanoparticles may not yield a homogeneous mixture.
1：Experimental Design and Method Selection:
Hydrothermal processing was used to synthesize heterogeneous MoS2 nanoflakes. TiO2 powder was mixed with polyester to obtain colloidal nanoparticle paste. Different wt% of MoS2 were mixed with TiO2 and the resultant paste was doctor bladed onto fluorine doped tin oxide (FTO) coated glass substrates.
2：Sample Selection and Data Sources:
Ruthenium based N-719 dye and iodide/tri-iodide were used as sensitizer and hole transport layer, respectively. Platinum film coated glass substrates were used as counter electrodes for the DSSCs.
3：List of Experimental Equipment and Materials:
JEOL JSM-6490-LA scanning electron microscope (SEM), Tecnai G2 TF20 S-TWIN transmission electron microscope (TEM), Kratos Analytical X-ray photoelectron spectroscopy unit, Perkin Elmer Lambda-750 spectrometer, Keithley 2400 digital source meter, Newport Oriel Class A solar simulator, Autolab electrochemical work station.
4：Experimental Procedures and Operational Workflow:
The mixture was annealed at 450 °C for 3 h. DSSCs were fabricated and their performance was measured under AM
5：5 illumination condition. Data Analysis Methods:
Current density–voltage (J–V) characteristics under AM 1.5 illumination condition, electro-chemical impedance spectroscopic (EIS) measurements.
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