研究目的
Investigating the effect of Na2S soaking on the properties of Cu2ZnSn(S,Se)4 films and solar cells.
研究成果
The Na2S soaking process eliminates the fine-grain layer in CZTSSe films and makes layer-boundaries continuous, improving solar cell performance. A 5 mM Na2S soaking significantly increases JSC and efficiency, but higher concentrations may limit crystallization and form defects.
研究不足
The study does not deeply investigate the detailed mechanism behind the phenomena observed with Na2S soaking, suggesting areas for further research.
1：Experimental Design and Method Selection:
The study proposes a Na2S soaking process as a post-treatment for precursor films of CZTSSe, followed by a normal selenization process.
2：Sample Selection and Data Sources:
Precursor films were prepared by spin-coating precursor solution on Mo-coated soda-lime glass substrates.
3：List of Experimental Equipment and Materials:
Bruker D8 Advance X-ray diffractometer, JY LabRAM HR Raman spectrometer, FEI Scanning Electron Microscopy, energy dispersive spectrometer, Agilent B1500A semiconductor parametric analyzer, QTesT 1000ADX setup.
4：Experimental Procedures and Operational Workflow:
Precursor films were soaked in Na2S aqueous solution, dried in nitrogen gas, and selenized using a graphite box. Solar cells were fabricated using the structure of Mo/CZTSSe/CdS/i-ZnO/AZO/Ag.
5：Data Analysis Methods:
XRD and Raman spectroscopy for constitution analysis, SEM for morphology characterization, EDS for composition analysis, I-V and QE measurements for solar cell performance.
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Bruker D8 Advance X-ray diffractometer
D8 Advance
Bruker
Analyzing the constitutions of the films
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JY LabRAM HR Raman spectrometer
LabRAM HR
JY
Analyzing the constitutions of the films with 532 nm laser
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Agilent B1500A semiconductor parametric analyzer
B1500A
Agilent
Characterizing the solar cell performances under AM 1.5G irradiations
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FEI Scanning Electron Microscopy
FEI
Characterizing the morphologies of the films
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Energy dispersive spectrometer
Analyzing the compositions of the thin films
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QTesT 1000ADX setup
1000ADX
QTesT
Measuring the quantum efficiency of the solar cells
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