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Method for synthesizing zinc-doped copper-indium-sulfur (Zn-doped CuInS2) quantum dots

A synthesis method and technology of quantum dots, applied in chemical instruments and methods, nanotechnology for materials and surface science, electrolytic capacitors, etc. problems such as poor performance, to achieve the effects of composite suppression of internal defects, stable structure, and simple and controllable methods

Inactive Publication Date: 2017-12-01
WENZHOU UNIVERSITY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, such preparation methods usually require the synthesis of CuInS 2 Quantum dots, and then introduce a Zn source to grow and coat the ZnS layer on the surface to form a core-shell structure. In this way, this method has poor controllability due to complicated steps, and although this method can reduce the surface electron vacancies to a certain extent hole recombination and makes the efficiency increase, however, due to the CuInS 2 The synthesis steps of quantum dots still lead to complex crystal structures, so the internal inherent defects of quantum dots cannot be effectively reduced. In TiO 2 Difficult to create a composite barrier with the quantum dot interface

Method used

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  • Method for synthesizing zinc-doped copper-indium-sulfur (Zn-doped CuInS2) quantum dots
  • Method for synthesizing zinc-doped copper-indium-sulfur (Zn-doped CuInS2) quantum dots
  • Method for synthesizing zinc-doped copper-indium-sulfur (Zn-doped CuInS2) quantum dots

Examples

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preparation example Construction

[0045] Preparation of indium source

[0046] Take by weighing 5.13g (30mmol) sodium diethyldithiocarbamate (Nadedc) and add in the beaker, add the deionized water of 200mL in the beaker, stir at room temperature for 30 minutes and make it dissolve completely (the aqueous solution is colorless, clear and transparent) ) to obtain sodium diethyldithiocarbamate aqueous solution; claim 2.92g (10mmol) indium acetate and join in another beaker, add 50mL deionized water in this beaker, stir at room temperature for 15 minutes and make it dissolve completely (the aqueous solution is Colorless, clear and transparent) to obtain indium acetate aqueous solution; the prepared indium acetate aqueous solution is dripped into the aqueous solution of sodium diethyldithiocarbamate (beginning to turn white in the solution) at 1 drop / second (with a 5mL plastic straw). Turbidity), after the dropwise addition, continue magnetic stirring at room temperature for 3 hours to completely react the raw mate...

Embodiment 1

[0047] Example 1: Zn-doped CuInS 2 Preparation of quantum dots

[0048] Weigh 18mg (0.05mmol) copper diethyldithiocarbamate, 55.7mg (0.1mmol) indium diethyldithiocarbamate, 1.8mg (0.005mmol) zinc diethyldithiocarbamate, 3ml Oleylamine was placed in a 50ml round-bottomed flask, placed in a constant temperature oil bath at 180°C for 20 minutes, and then cooled to room temperature. Centrifuge the solution after the reaction, discard the precipitate, wash the supernatant with n-hexane and centrifuge, discard the precipitate again, add ethanol to the supernatant and centrifuge, repeat the washing and centrifugation several times until the centrifuged The supernatant was colorless and transparent, and the final precipitate was taken as the final product.

[0049] Product composition, structure and morphology characterization:

[0050] The final product is dissolved in dichloromethane, and after the dichloromethane volatilizes, the product is subjected to XRD measurement, and the ...

Embodiment 2

[0080] Weigh 18mg (0.05mmol) copper diethyldithiocarbamate, 55.7mg (0.1mmol) indium diethyldithiocarbamate, 18.1mg (0.05mmol) zinc diethyldithiocarbamate, 3ml Oleylamine was placed in a 50ml round-bottomed flask, placed in a constant temperature oil bath at 180°C for 20 minutes, and then cooled to room temperature. Centrifuge the solution after the reaction, discard the precipitate, wash the supernatant with n-hexane and centrifuge, discard the precipitate again, add ethanol to the supernatant and centrifuge, repeat the washing and centrifugation several times until the centrifuged The supernatant was colorless and transparent, and the final precipitate was taken as the final product.

[0081] After identification, the same as Example 1, the final product of Example 2 is Zn-doped CuInS 2 Quantum dots with a size of 4-5nm and good dispersion.

[0082] Example 2 is prepared to obtain the product and carry out the result of XRD test such as Figure 7 shown. From Figure 7 It...

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Abstract

The invention provides a method for synthesizing zinc-doped copper-indium-sulfur (Zn-doped CuInS2) quantum dots. The method is characterized in that by using copper diethyldithiocarbamate as a copper source, indium diethyldithiocarbamate as an indium source, zinc diethyldithiocarbamate as a zinc source, oleylamine as a ligand and a solvent, one-step reaction is conducted to prepare the Zn-doped CuInS2 quantum dots. The Zn-doped CuInS2 quantum dots prepared according to the invention have the size of 4 to 5nm and a good photoelectric property, and are suitable for preparing a quantum dot sensitized solar cell. According to the invention, the zinc content of the quantum dots can be changed by changing the quantity of the zinc source; compared with pure CuInS2 quantum dots, the Zn-doped CuInS2 quantum dots obtained by the method have fewer internal defects; compared with a thermal injection method, the method provided by the invention has the advantages of simple and easy operation, simpler process, shorter synthesis cycle, good production controllability and repeatability and low cost, and the method provided by the invention is suitable for industrialized production, and has a wide application prospect in the solar cell.

Description

technical field [0001] The invention belongs to the field of photovoltaic material preparation, and in particular relates to a synthesis method of quantum dots. Background technique [0002] Energy is an important material basis that affects the development of the national economy and the improvement of human living standards. However, traditional coal, oil, natural gas and other fossil energy sources are limited and will pollute the environment, restricting the sustainable development of human beings. As one of the renewable energy sources, solar energy has the characteristics of abundant resources, wide distribution, environmental friendliness and sustainable utilization. Solar cells convert solar energy into electrical energy, which is the most direct and effective way to utilize solar energy. [0003] After more than 100 years of development, solar cells can be divided into three generations according to their development history and production materials: silicon-based...

Claims

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Application Information

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IPC IPC(8): C09K11/62B82Y20/00B82Y30/00B82Y40/00H01G9/20
CPCB82Y30/00B82Y40/00C09K11/623H01G9/2063Y02E10/542
Inventor 邹超吴琴琴翟兰兰张礼杰杨云黄少铭
Owner WENZHOU UNIVERSITY
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