Method for synthesis of Cu-In-Al-Se nanocrystalline by using ethanediamine auxiliary polyhydric alcohol solution

Abstract

The invention discloses a method for synthesis of Cu-In-Al-Se nanocrystalline by using an ethanediamine auxiliary polyhydric alcohol solution; the method using a direct injection method is as follows: first, weighing copper chloride dihydrate, indium chloride tetrahydrate and aluminum chloride hexahydrate to dissolve in triethylene glycol to prepare a cation precursor solution, wherein the molar ratio of Cu / (In + Al) being 1, and the molar ratio of In / Al being 3:1; then adding the triethylene glycol into a three-port round-bottom flask, adding selenium powder and adding polyvinylpyrrolidone to produce an anion source reaction based liquid; and then synthesizing the Cu-In-Al-Se (CIASe) nanocrystalline by reflux reaction, and when injection temperature / reflow temperature being 210 DEG C, adding 1-2 ml of ethylenediamine being. The method has the advantages of mild reaction conditions, safety and low toxicity, easy operation, low cost, single and stable product phase and good repeatability.

Description

technical field [0001] The invention relates to nanometer materials, in particular to a method for synthesizing copper indium aluminum selenium nanocrystals from a polyol-based solution assisted by ethylenediamine. Background technique [0002] As a representative light-absorbing semiconductor material for thin-film photovoltaic cells, copper indium selenium CuInSe 2 (CISe) compounds have the advantages of high visible light absorption coefficient, lower manufacturing cost and energy repayment time than crystalline silicon solar cells, good battery stability, almost no attenuation, good weak light performance and high photoelectric conversion efficiency. Since the forbidden band width of CISe is about 1.04eV, the band gap that best matches the solar spectrum is around 1.4eV. Therefore, in order to achieve the most suitable bandgap, improve conversion efficiency and match with other layers, CISe needs to be doped to increase the bandgap, for example, Al can be used to replac...

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Problems solved by technology

[0004] The purpose of the present invention is to overcome the shortcomings of the prior art, such as time-consuming, energy-consuming, high cost, complicated operation, unfavorable for large-scale production, and difficult control of chemical components. Diamine is used as a reaction auxiliary agent, providing a method for preparing CIASe nanocrystals with safe process, beneficial to product purity and stoichiometric control, green, non-toxic, and low cost

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