研究目的
To investigate the relationship between the dark current (IDC), the series resistance (Rs) and the shunt resistance (Rsh) for evaluating the fill factor (FF) of low-efficiency DSSCs due to photoanodes with nonp-TiO2 surfaces and very thick ITO for contact layer.
研究成果
The study concludes that low-efficiency DSSCs exhibit a linear J-V graph due to low shunt resistance (Rsh) and high series resistance (Rs). The thick ITO layer reduces the resistance of photoanodes but hinders efficient electron transfer to the external circuit. The nonporous TiO2 layer prevents dark current but decreases the current density. The research highlights the importance of optimizing the thickness of the ITO layer and the porosity of the TiO2 layer to improve DSSC performance.
研究不足
The study is limited by the use of nonporous TiO2 layers and very thick ITO layers, which negatively affect the efficiency of DSSCs. The linear shape of the J-V curve and low fill factor are significant constraints. Potential areas for optimization include reducing the thickness of the ITO layer and increasing the porosity of the TiO2 layer to enhance electron transfer and dye adsorption.
1：Experimental Design and Method Selection:
The study involved the fabrication of DSSCs with TiO2-based bilayer photoanodes, characterized by nonporous TiO2 surfaces and thick ITO layers. The methodology included the use of magnetron sputtering for coating dense TiO2 layers and spray pyrolysis for nonporous TiO2 layers.
2：Sample Selection and Data Sources:
Microscope glass substrates were used for coating photoanodes. ITO and TiO2 layers were characterized for their electrical and optical properties.
3：List of Experimental Equipment and Materials:
Equipment included a magnetron sputtering system, spray pyrolysis setup, UV-Vis absorption spectroscopy, AFM, and XRD. Materials included ITO and TiO2 targets, titanium (IV) isopropoxide, ethanol, and acetylacetone.
4：Experimental Procedures and Operational Workflow:
The process involved cleaning substrates, depositing ITO and TiO2 layers, fabricating DSSCs, and measuring their J-V characteristics under dark and light conditions.
5：Data Analysis Methods:
The analysis included calculating resistivity, conductivity, optical band gap, crystallite size, and photovoltaic performance parameters like Voc, Jsc, FF, and efficiency.
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