Method for efficiently synthesizing CuInSe2 quantum dots with chalcopyrite structures

Abstract

The invention discloses a method for efficiently synthesizing CuInSe2 quantum dot with a chalcopyrite structure. By using a method for dissolving selenium powder by using a mixed solvent of oleylamine and hexadecyl mercaptan instead of oleylamine single solvent, a difficulty problem that high temperature is needed during dissolving the selenium powder by using oleylamine is solved. By using cheap indium trichloride tetrahydrate as an indium source instead of expensive anhydrous indium trichloride or indium acetate and using octadecene as metallic precursor instead of partial oleylamine, the CuInSe2 quantum dot with the chalcopyrite structure is successfully synthesized. Compared with the traditional hot injection method, the method for efficiently synthesizing the CuInSe2 quantum dots with the chalcopyrite structures, disclosed by the invention, has the advantages of low raw material cost, simple operation, easy control, high repeatability and no pollution to environment. The synthesized CuInSe2 quantum dot has the advantages of less defects, high yield, uniform particle size distribution, good dispersion and important industrial application values and can be used for preparing CuInSe2 quantum dot solar cells.

Description

technical field [0001] The invention belongs to the technical field of solar photovoltaic material preparation, in particular to the efficient synthesis of CuInSe with a chalcopyrite structure 2 method of quantum dots. Background technique [0002] Semiconductor quantum dots are quasi-zero-dimensional nanomaterials, generally composed of a small number of atoms, also known as "artificial atoms". Because the size of the three dimensions of quantum dots is generally between 1 and 100 nm, the movement of electrons in them is limited in all directions, and thus exhibits many unique properties, such as quantum confinement effects, surface effects, and quantum size effects. And the multi-exciton effect, etc., so that it has broad application prospects in the fields of new luminescent materials, photocatalytic materials and photovoltaic power generation materials. [0003] CuInSe 2 The excitonic Bohr radius of the material is 10.6nm, and nanocrystals smaller than this size are c...

AI Technical Summary

Problems solved by technology

However, the raw materials (anhydrous indium trichloride, indium acetate, etc.) and solvent (oleylamine) used in the current hot injection method are expensive, and the dissolving of selenium powder needs expensive phosphorus-containing solvents (tri-n-octylphosphine, tri-n-octylphosphine, tri-n-octylphosphine, etc.) Butylphosphine, etc.) or higher dissolution temperature (soluble in oleylamine at about 250°C), is not conducive to the large-scale synthesis of CuInSe by hot injection method 2 quantum dot

According to the literature Zhong H, Li Y, Ye M, et al.A facile route to synthesize chalcopyrite CuInSe 2 nanocrystals in non-coordinating solvent[J].Nanotechnology,2007,18(2):025602. The reported method uses a mixture of dodecylmercaptan and octadecene as a metal precursor solvent, and tri-n-octyl Phosphine is used as a solvent for selenium powder, injected at 180°C and reacted for 1 hour, CuInSe with uniform particle size can be obtained 2 Quantum dots, but the mixture of dodecyl mercaptan and octadecene has a high viscosity at low temperature, it is difficult to remove the water and air dissolved in it, and the expensive and environmentally harmful tri-n-octyl phosphine is used in this paper. In addition, , the actual output of this method is relatively small, and the particle size of the synthesized quantum dots is relatively large

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