研究目的
To investigate the influence of shell numbers on photovoltaic performance of quantum dots sensitized solar cells (QDSSC) and to improve the power conversion efficiency through the design of Mn-doped CdxZn1-xSe@ZnO triple-shelled hollow microspheres.
研究成果
The Mn-CdxZn1-xSe@ZnO triple-shelled HMS solar cell achieved a power conversion efficiency of 3.39%, which is significantly higher than single-shelled and double-shelled HMS solar cells. The improved performance is attributed to larger surface area, repeated light reflection, reinforced light scattering, and midgap state created by Mn-doping.
研究不足
The study focuses on the synthesis and application of Mn-CdxZn1-xSe@ZnO HMS in QDSSCs, but the scalability and long-term stability of these solar cells under real-world conditions were not addressed.
1：Experimental Design and Method Selection:
The study involved the synthesis of Mn-CdxZn1-xSe@ZnO multi-shelled hollow microspheres (HMS) using carbonaceous sphere template method, SILAR method, and cation ion-exchange process.
2：Sample Selection and Data Sources:
Carbonaceous microspheres were used as templates, and the size was controlled by varying hydrothermal reaction time.
3：List of Experimental Equipment and Materials:
SEM, TEM, UV-Vis spectrophotometer, electrochemical workstation, and various chemicals including zinc nitrate, sucrose, cadmium nitrate, etc.
4：Experimental Procedures and Operational Workflow:
The synthesis involved hydrothermal process for carbonaceous spheres, soaking in zinc nitrate solution, heating to form ZnO HMS, and then sensitizing with Mn-CdxZn1-xSe QDs.
5：Data Analysis Methods:
The photovoltaic performance was analyzed using I-V test station, IPCE measurements, and EIS tests.
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Quanta 450 FEG scanning electron microscopy
Quanta 450 FEG
Hillsboro, OR, USA
To record the morphology of the prepared products.
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Tecnai G2 F20 transmission electron microscope
Tecnai G2 F20
Hillsboro, TX, USA
To record the morphology of the prepared products.
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U-3900H UV–Vis spectrophotometer
U-3900H
Dallas, TX, USA
To record the optical absorption properties of the photoanodes.
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Oriel I–V test station
Oriel
Newport, USA
To investigate the I–V performance of the QDSSCs.
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Electrochemical workstation
CHI852C
Shanghai, China
To carry out electrochemical impedance spectroscopy (EIS) tests of solar cells.
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