研究目的
To improve the efficiency of planar perovskite solar cells (PSCs) by using solution processed SnO2/CdS as electron transport layer.
研究成果
The study demonstrated that a thin interface layer of CdS nanoparticles on top of SnO2 layer consistently improves the electron transporting properties of SnO2 layer, facilitating electron transfer from perovskite layer to SnO2. The hysteresis index was reduced and the efficiency of the planar PSCs was improved. The findings suggest that CdS NPs can passive the trap states made by surface defects in SnO2 and decrease the recombination at the ETL/perovskite interface.
研究不足
The study was conducted under ambient air condition, which may affect the performance of the solar cells compared to controlled atmosphere conditions. The deposition of high quality SnO2 ETL is not straightforward and usually needs some sort of modification to attain high device efficiency.
1：Experimental Design and Method Selection:
The study involved the fabrication of SnO2 and SnO2/CdS layers by solution process using a suspension including CdS nanoparticles synthesized via a simple solution route. Planar PSCs with the structure of Glass/FTO/ETL/Perovskite/Sprio-OMeTAD/Au were fabricated in ambient air condition using SnO2 and SnO2/CdS as ETL.
2：Sample Selection and Data Sources:
Fluorine doped tin oxide (FTO) coated glass substrates were used. CdS nanoparticles were synthesized and applied on top of SnO2 ETL.
3：List of Experimental Equipment and Materials:
FTO coated glass substrates, SnCl2·2H2O, ethanol, CdCl2·2.5H2O, Sulfur, butyl amine, DMF, Spiro-OMeTAD, gold for top contact metal electrode.
4：5H2O, Sulfur, butyl amine, DMF, Spiro-OMeTAD, gold for top contact metal electrode.
Experimental Procedures and Operational Workflow:
4. Experimental Procedures and Operational Workflow: The FTO substrates were cleaned and treated with UV/Ozone before coating. SnO2 precursor solution was spin coated on clean FTO substrates and annealed. CdS NPs were deposited on top of the SnO2 layers via spin coating and annealed at different temperatures. Perovskite absorber layer was deposited on top of the ETLs via one step deposition method. Spiro-OMeTAD precursor solution was deposited on perovskite absorber layers by spin coating. Finally, a thin film of gold was evaporated as top contact metal electrode.
5：Data Analysis Methods:
The performance of the solar cells was evaluated by J-V measurement under AM1.5G simulated sunlight. Mott-Schottky analysis was used to calculate the carrier density and flat band potential of ETLs. Impedance spectroscopy was used to study the electronic transfer phenomena at the interfaces.
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