研究目的
Investigating the effect of the thickness of CdSe-sensitized mesoscopic TiO2 electrodes on the efficiency of the complete cell.
研究成果
The thickness of CdSe nanoparticles deposited on TiO2 mesoporous films significantly affects the efficiency of quantum-dot-sensitized solar cells. Increasing the deposition time increases the thickness of CdSe nanoparticles, leading to higher photo conversion efficiency. The highest efficiency of 2% was achieved with a CdSe thickness of 3 μm.
研究不足
The study focused on the effect of CdSe thickness on the efficiency of QDSSCs but did not explore the optimization of other parameters such as the voltage and deposition time for TiO2, or the composition of the electrolyte. The efficiency achieved (2%) is relatively low compared to other solar cell systems.
1：Experimental Design and Method Selection:
The study used electrophoretic deposition (EPD) method to fabricate QDSSCs photoanode due to its advantages of short formation time, simple apparatus, and easy control of the thickness and morphology of a deposited film.
2：Sample Selection and Data Sources:
TiO2 and CdSe nanoparticles were deposited onto fluorine doped tin oxide (FTO) glass by EPD. CdSe/TiO2 films were used for photoanode and Cu2S film was used for photocathode.
3：List of Experimental Equipment and Materials:
Titanium dioxide (TiO2) P25 nanoparticle from Degussa, propionic acid, ethylacetate, methanol, n-hexylamine, chloroform, selenium powder (Se), trioctylphosphine (TOP), cadmium acetate, trioctylphosphine oxide (TOPO), hexadecylamine (HDA), and tetra-decylphosphonic acid (TDPA).
4：Experimental Procedures and Operational Workflow:
TiO2 nanoparticles solution was prepared by mixing TiO2 P25 nanoparticle with propionic acid, stirring, centrifugation, washing, and sonication. CdSe nanoparticles were synthesized using one-pot hot injection technique. CdSe/TiO2 films were prepared by EPD method at fixed voltage of 100 V and varying deposition times (60 s, 90 s, and 120 s).
5：Data Analysis Methods:
UV-visible spectroscopy and scanning electron microscope (SEM) were used for characterization. The power conversion efficiency was evaluated under simulated AM 1.5, 100 mW cm-2 illumination.
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