Quantum dot with core shell structure and preparation method of quantum dot

Abstract

The invention discloses a quantum dot with a core shell structure and a preparation method of the quantum dot. The quantum dot with the core shell structure is provided with the core shell structure with a cadmium sulfide material as a core and a cadmium sulfite material as a shell and is prepared through a hydrothermal synthesis method. The quantum dot with the core shell structure, provided by the invention, has the core with the size of 3-6 nm and a shell layer with the thickness of 0.1-0.5 nm. The quantum dot is perfectly crystallized and has the advantages of high stability, favorable fluorescence emission peak shape, stable maximum emission peak position, and the like. Because the hydrothermal synthesis method is adopted for the preparation method of the quantum dot with the core shell structure, provided by the invention, the defects of many structural imperfections, poor chemical stabilization and poor fluorescence emission performance of the quantum dot prepared by the traditional water method are overcome, the toxicity and high cost of the quantum dot prepared by a metal organic method are also avoided, the preparation method has the advantages of simplicity, easiness for operation and low cost, and the quantum dot with the core shell structure and adjustable granularity can be prepared by utilizing the hydrothermal synthesis method.

Description

technical field [0001] The invention relates to the technical field of nanomaterials for photovoltaic cells, in particular to a quantum dot with a core-shell structure and a preparation method thereof. Background technique [0002] The sun provides about 100,000 megawatts of energy that we can use, which is about 10,000 times the current energy consumption rate of the earth. Photovoltaic cells are increasingly being used to exploit this vast energy resource and will play a key role in future sustainable energy systems. However, due to the high cost of directly converting solar energy into electricity through photovoltaic cells, for example, the cost is 5 to 10 times that of nuclear energy and 25 to 50 times that of primary fossil energy, the problem of high cost has consistently hindered the use of photovoltaic cells The rapid development of the industry. [0003] Recent experiments have shown that the new quantum dot technology based on nanotechnology can significantly im...

AI Technical Summary

Problems solved by technology

However, due to the high cost of directly converting solar energy into electricity through photovoltaic cells, for example, the cost is 5 to 10 times that of nuclear energy and 25 to 50 times that of primary fossil energy, the problem of high cost has consistently hindered the development of photovoltaic cells. The rapid development of the industry

However, the pure chemical synthesis method to synthesize core-shell structure nanocrystals and directly use them to improve the photoelectric conversion efficiency of silicon solar cells has not been reported.

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