研究目的
To synthesize Cu(Zn,Sn)Se2 (CZTSe) nanoparticles with single phase, copper-poor composition, high crystallinity and good dispersion in organic solvents for fabricating absorber layer in solar cells.
研究成果
The injection speed of the selenium precursor is crucial for controlling the Cu/(Zn + Sn) ratio in CZTSe nanoparticles. Nanoparticles synthesized at an optimal injection speed exhibited single phase, high crystallinity, and copper-poor composition, suitable for solar cell absorber layers. The solar cell fabricated with these nanoparticles achieved a conversion efficiency of 5.8%.
研究不足
The VOC and FF of the fabricated solar cells were rather low, indicating a need for optimization of the fabrication process to achieve higher cell parameters.
1：Experimental Design and Method Selection:
The synthesis of CZTSe nanoparticles was performed using the hot-injection method, focusing on controlling the injection speed of the Se precursor to achieve desired nanoparticle properties.
2：Sample Selection and Data Sources:
Nanoparticles were synthesized with varying Cu/(Zn + Sn) precursor ratios and Se precursor injection speeds to study their effects on nanoparticle composition and phase.
3：List of Experimental Equipment and Materials:
Selenium pellets, oleylamine, hexanethiol, copper(II) acetylacetonate, bis(2,4-pentanedionato)zinc(II), tin(IV) Bis(acetylacetonate) dibromide, and a three-neck flask were used.
4：Experimental Procedures and Operational Workflow:
The synthesis involved dissolving selenium in a mixture of oleylamine and hexanethiol, mixing metal precursors with oleylamine, heating to 235°C, injecting the Se solution, and reacting for 1 hour. Nanoparticles were then separated and redispersed in hexanethiol.
5：Data Analysis Methods:
Structural analysis was performed using XRD, EDX, and HR-TEM. Photovoltaic measurements were conducted using a solar simulator.
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energy-dispersive X-ray analysis
Jeol JSM-7600F
Jeol
Used for elemental analysis of CZTSe nanoparticles.
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high-resolution scanning transmission microscopy
JEM2100
Jeol
Used for imaging and analysis of CZTSe nanoparticles.
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selenium pellets
Sigma–Aldrich
Used as a precursor in the synthesis of CZTSe nanoparticles.
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hexanethiol
Sigma–Aldrich
Used as a solvent in the synthesis of CZTSe nanoparticles.
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copper(II) acetylacetonate
Used as a precursor in the synthesis of CZTSe nanoparticles.
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bis(2,4-pentanedionato)zinc(II)
Tokyo Chemical Industry
Used as a precursor in the synthesis of CZTSe nanoparticles.
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tin(IV) Bis(acetylacetonate) dibromide
Aldrich
Used as a precursor in the synthesis of CZTSe nanoparticles.
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oleylamine
Sigma–Aldrich
Used as a solvent in the synthesis of CZTSe nanoparticles.
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X-ray diffraction
D8-Advance
Germany
Used for structural analysis of CZTSe nanoparticles.
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solar simulator
Used for photovoltaic measurements of solar cells.
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