Preparation method of ZnSe nanocrystal, ZnSe nanocrystal and preparation method of ZnSe buffer layer

Abstract

The invention discloses a preparation method of ZnSe nanocrystal. The preparation method of the ZnSe nanocrystal comprises the following steps: S1, preparing selenium precursor solution, namely preparing a reaction solution by utilizing oleylamine, a selenium simple substance and a reducing agent, heating and reacting, and thus the selenium precursor solution is obtained, wherein concentration of the selenium precursor solution in the reaction solution is 0.25-1.5mol/L, the mole ratio of the reducing agent to the selenium simple substance is more than 1:1, and the reducing agent is dimethylamine borane or sodium borohydride; S2, preparing a zinc precursor solution, namely dispersing a zinc source in a reaction solvent to obtain the zinc precursor solution, wherein mole ratio of the zinc source to the selenium simple substance is 1:(1-1.5), and the reaction solvent is oleylamine or a mixed solvent of octadecene and stearic acid; and S3, preparing ZnSe nanocrystal, namely heating the zinc precursor solution obtained in the step S2 to 150-350 DEG C in an anhydrous oxygen-free system, then injecting the selenium precursor solution obtained in the step S1 into the zinc precursor solution, and reacting for at least 10 minutes, and thus the ZnSe nanocrystal is obtained. By adopting the preparation method of the ZnSe nanocrystal, high-quality ZnSe nanocrystal can be prepared.

Description

technical field [0001] The invention relates to the preparation of nanometer materials and buffer layers of thin-film solar cells, in particular to a preparation method of ZnSe nano crystals, a preparation method of ZnSe nano crystals and a ZnSe buffer layer. Background technique [0002] Semiconductor nanomaterials have broad application prospects due to their unique photoelectric properties, such as ZnSe, which is an important metal selenide. At present, the liquid phase preparation of ZnSe nanocrystals generally requires the use of tri-n-octylphosphine (TOP) Or organic phosphine compounds such as trioctylphosphine oxide (TOPO), but TOP and TOPO are highly toxic substances, unstable in nature, easy to oxidize and expensive, and limited by other conditions, ZnSe nanocrystals prepared by existing preparation methods The lower quality is not conducive to the application of ZnSe nanocrystals. [0003] In thin-film solar cells such as CIGS thin-film solar cells, the buffer lay...

AI Technical Summary

Problems solved by technology

However, as we all know, cadmium is a heavy metal poisonous element, and the pollution problem greatly limits the large-scale development of CIGS solar cells.

In addition, the band gap of CdS is 2.4eV, and the band gap is narrow, which has a certain influence on the short-wave absorption and photoelectric conversion response.

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