研究目的
To demonstrate the universality of electrophoretic deposition (EPD) as an approach to sensitise TiO2 electrodes with a diverse range of colloidal quantum dots (CQDs) and to optimize the EPD technique for production of various II-VI CQDs sensitised TiO2 composites.
研究成果
The study demonstrated the wide applicability of EPD for sensitizing TiO2 electrodes with a diverse range of CQDs. The choice of solvent, particularly dichloromethane (DCM), was found to significantly optimize the efficiency of EPD due to its higher dielectric constant. The work highlighted the potential of EPD in the fabrication of quantum dot sensitized solar cells (QDSSCs) and other optoelectronic devices.
研究不足
The study was limited by the inability to confirm electrophoretic mobility and zeta potential for CdSe CQDs in the tested solvents due to instrumentation limitations. Additionally, the repeatability of the EPD process was affected by the standing time of the CQD solutions and the number of cleaning cycles applied to the CQDs.
1：Experimental Design and Method Selection:
The study utilized electrophoretic deposition (EPD) to deposit colloidal quantum dots (CQDs) on TiO2 electrodes in various solvents. The methodology included the selection of solvents based on their dielectric constants and the application of electrical fields to drive the deposition of CQDs.
2：Sample Selection and Data Sources:
Oleic acid capped CdSe CQDs of different sizes were synthesized in-house. TiO2 electrodes were fabricated using screen printing and sintering techniques.
3：List of Experimental Equipment and Materials:
Equipment included a Metrohm μAutolab type III electrochemical impedance analyser, Agilent Cary 60 UV-Vis spectrometer, FEI Titan Transmission Electron Microscope, and Zeiss Ultra plus SEM. Materials included SnO2/F coated glass, Na2S, TiCl4, ZnCl2, and various solvents.
4：Experimental Procedures and Operational Workflow:
The EPD process involved immersing two electrodes into a CQD solution, applying a voltage, and monitoring the deposition over time. The electrodes were then characterized using UV-Vis absorption spectroscopy, SEM, TEM, and photoresponsivity measurements.
5：Data Analysis Methods:
The data was analyzed to determine the effectiveness of different solvents in the EPD process, the optimal deposition times, and the photocurrent response of the sensitized electrodes.
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