Recently, researchers from the Institute of Solid State Physics at the Hefei Institute of Materials Science, Chinese Academy of Sciences successfully implemented a series of phase and energy band regulation of a series of polychalcogenide nanocrystals. The materials exhibited good electrocatalytic, thermoelectric, dielectric, and near-infrared absorption properties. .
Polychalcogenides have important applications in photovoltaic, thermoelectric, electrocatalytic, photothermal, nonlinear optics, optical storage and other fields, and have been the focus of research in recent years. In particular, copper-zinc-tin-sulfur (Cu2ZnSnS4, CZTS) and other materials exhibit excellent performance in the fields of solar cells, photodetectors, and thermoelectric conversion due to the abundance and non-toxicity of the constituent elements. However, polychalcogenides are often accompanied by the presence of binary or ternary miscellaneous phases that affect material properties. On the basis of the adjustable size of the nanocrystals, the inhibition of the generation of heterophases and the ultimate control of the unitary nature of the material phases is a great challenge in the synthesis method. More importantly, when the polychalcogenide is applied in different fields such as photovoltaic and electrocatalysis, the energy band width and energy band position must be controlled within a certain range. This is a challenging scientific problem in material design.
Members of the research group led by Professor Shigeyuki Nagai used the heat injection method to obtain AgBiS2 and Cu3SbS3 nanocrystals with uniform size and phase by controlling the reaction kinetics. The composite material has unique dielectric and near-infrared absorption properties. The results were published in the "Cryst Engineering Communications" (CrystEngComm 15, 7644, 2013 and CrystEngComm DOI: 10.1039/C3CE41861H) of the Royal Society of Chemistry.
Further, through controlled elemental doping, the researchers obtained all-component pure-phase nanocrystals from copper zinc tin sulfide (CZTS) to copper zinc tin selenium (CZTSe), and copper zinc tin sulfide selenium was calibrated by an experimental system ( CZTSSe's energy band position lays the foundation for its application in high-efficiency solar cells (such as rainbow cells) and catalytic systems. The relevant results were published in the Nature Scientific Group's Scientific Reports 3, 2733, 2013 and applied for three national invention patents (201210124738.X, 201210156367.3, 201210294934.1).
The above research has been funded by the National Major Scientific Research Program, the National Natural Science Foundation, and the “100-person Plan†project of the Chinese Academy of Sciences.
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