研究目的
To propose a facile, low cost, and scalable sol–gel method for the coating of ultra-thin layer of TiO2 on FTO substrate as a seed layer for the growth of 3D-TiO2 nanorod arrays on FTO, and to investigate their photovoltaic characteristics in DSSCs with iodine-based and cobalt(II/III) tris(2,2′-bipyridine) complex-based electrolytes.
研究成果
The sol–gel-derived seed layer on FTO/TiO2-sg had a pivotal role for the tightly adhesion of TiO2 nanorod arrays grown on FTO. The 3D-TiO2-NR nanostructure provided a direct pathway for the electron transfer in nanorod/FTO interface, improving the photovoltaic characteristics of DSSCs with bulky electron shuttles. The rapid diffusion of cobalt redox couple in 3D-TiO2-NR structure led to the remarkable reduction in the charge transfer resistance.
研究不足
The study focuses on the fabrication and characterization of 3D-TiO2 nanorod arrays and their application in DSSCs. The limitations include the specific conditions required for the sol–gel and hydrothermal processes, and the performance of DSSCs may vary with different electrolytes and dyes.
1：Experimental Design and Method Selection:
A sol–gel method was used for the coating of ultra-thin layer of TiO2 on FTO substrate. A two-step hydrothermal process including nanorod growth and chemical etching treatment was proceeded for the fabrication of FTO/3D-TiO2-NR photoanodes.
2：Sample Selection and Data Sources:
FTO substrate was used for the growth of TiO2 nanorod arrays. The thickness of the deposited TiO2 was measured with small-angle X-ray scattering technique.
3：List of Experimental Equipment and Materials:
FE-SEM and TEM techniques were used for morphological characterization. DSSCs were assembled with iodine-based and cobalt(II/III) tris(2,2′-bipyridine) complex-based electrolytes.
4：Experimental Procedures and Operational Workflow:
The sol–gel method was used for the deposition of TiO2 thin film on FTO glass substrate. The two-step hydrothermal process was used for the growth and post-treatment of TiO2 nanorod arrays. DSSCs were assembled and their photovoltaic characteristics were investigated.
5：Data Analysis Methods:
The photovoltaic characteristics of DSSCs were investigated by measuring the current density versus voltage under simulated sunlight irradiation. Electrochemical impedance spectroscopy was used to study the charge transfer resistance.
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