研究目的
Investigating the synthesis of ultrathin PbSnS2 flakes via CVD assisted by salt and a molecular sieve, and studying their giant anisotropic electronic and optoelectronic properties.
研究成果
The successful synthesis of ultrathin PbSnS2 flakes via CVD assisted by salt and a molecular sieve demonstrates giant anisotropic electronics and optoelectronics. This method provides a new platform for the design of other 2D ternary materials.
研究不足
The synthesis of ultrathin PbSnS2 structures is difficult to control due to the complex multi-precursor and reaction process, as well as the undesirable phases that may exist in the reaction such as PbS or SnS.
1：Experimental Design and Method Selection:
The synthesis of ultrathin PbSnS2 flakes was achieved through a CVD method with the assistance of salt and a molecular sieve. The method selection was based on the need to lower the melting point of metal precursors and ensure uniform distribution of source vapors.
2：Sample Selection and Data Sources:
High-purity sulfur and a mixture of Pb3O4, SnO, and KCl powders were used as sources. Mica substrates were used for collecting the synthesized flakes.
3：List of Experimental Equipment and Materials:
The equipment included a tube furnace, optical microscope, Raman microscope, AFM, TEM, and semiconductor parameter analyzer. Materials included Pb3O4, SnO, KCl, sulfur, and mica substrates.
4：Experimental Procedures and Operational Workflow:
The furnace was heated to 640°C with H2 and Ar gas flow. The reaction was carried out for 30 minutes before cooling down quickly.
5：Data Analysis Methods:
The synthesized flakes were characterized using optical microscopy, Raman spectroscopy, AFM, and TEM. The optoelectrical properties were measured using a semiconductor parameter analyzer.
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TEM
Tecnai G2 F30
FEI
Used for characterizing the crystal structure of the PbSnS2 flakes.
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semiconductor parameter analyzer
B1500A
Keithley
Used for measuring the optoelectrical properties of the PbSnS2 flakes.
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optical microscope
BX51
Olympus
Used for characterizing the synthesized PbSnS2 flakes.
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Raman microscope
Alpha 300R
WITec
Used for measuring the Raman spectra of the PbSnS2 flakes.
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AFM
Dimension Icon
Bruker
Used for measuring the thickness of the PbSnS2 flakes.
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tube furnace
Used for the synthesis of PbSnS2 flakes via CVD.
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