研究目的
To investigate the synthesis of ZnxCd1-xSe@ZnO hollow spheres in different sizes for application in quantum dots sensitized solar cells (QDSSCs) and to study their photovoltaic performance.
研究成果
The study successfully fabricated ZnxCd1-xSe@ZnO hollow spheres with tunable sizes and demonstrated their application in QDSSCs. The photovoltaic performance was significantly influenced by the size of the hollow spheres, with the ~500 nm size showing the best performance. The mixture of hollow spheres of different sizes further improved the power conversion efficiency, indicating the potential of this strategy for designing high-efficiency QDSSCs.
研究不足
The study focuses on the size effect of ZnxCd1-xSe@ZnO hollow spheres on photovoltaic performance but does not extensively explore the optimization of other parameters such as the thickness of the photoanode or the concentration of quantum dots.
1：Experimental Design and Method Selection:
The study involved the fabrication of ZnxCd1-xSe@ZnO hollow spheres through an ion-exchange process using ZnO hollow spheres as templates. The sizes of the hollow spheres were controlled by varying the sizes of carbonaceous spheres used as templates.
2：Sample Selection and Data Sources:
Carbonaceous spheres of different sizes were synthesized by hydrothermal process of sucrose aqueous solution. ZnO hollow spheres were then synthesized using these carbonaceous spheres as templates.
3：List of Experimental Equipment and Materials:
Materials included sucrose, zinc nitrate, cadmium nitrate, selenium powder, sodium borohydride, ethylcellulose, terpinol, ethanol, sodium sulfide, and sulfur powder. Equipment included a Quanta 450 FEG scanning electron microscopy (SEM), Tecnai G2 F20 transmission electron microscope (TEM), and U-3900H UV-VIS spectrophotometer.
4：Experimental Procedures and Operational Workflow:
The process involved the synthesis of carbonaceous spheres, their use as templates for ZnO hollow spheres, and the subsequent ion-exchange process to form ZnxCd1-xSe@ZnO hollow spheres. The photovoltaic performance of QDSSCs based on these hollow spheres was then evaluated.
5：Data Analysis Methods:
The photovoltaic performance was analyzed using current density–voltage (J–V) behavior and incident photon to the charge carrier generation efficiency (IPCE) measurements.
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