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Preparation method of CuInS2 nanoparticles

A nanoparticle and solution technology, applied in the field of nanomaterials, achieves the effects of simple and unique method, simple synthesis steps, and avoiding physical methods

Inactive Publication Date: 2011-05-25
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to prepare CuInS at present 2 A series of problems in the process of vacuum evaporation, sputtering, post-sulfurization, spraying pyrolysis and other processes used in nano-photovoltaic thin films, CuInS with small particle size and uniform particle size was prepared by solvothermal method 2 nanoparticles

Method used

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  • Preparation method of CuInS2 nanoparticles
  • Preparation method of CuInS2 nanoparticles
  • Preparation method of CuInS2 nanoparticles

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Weigh 1mmol copper chloride and dissolve it in 40ml DMF; then add 1mmol indium chloride to the above solution and stir to dissolve it; finally add 2.0mmol L-cysteine ​​to the above mixture to make the copper source, The ratio of the amount of indium source to the sulfur source is 1:1:2, then add 1.5mol / L ammonia water dropwise under constant stirring, adjust the pH value of the solution to 8, and transfer it into a 50mL container after forming a clear solution. After sealing in a polytetrafluoroethylene-lined autoclave, keep the temperature in a drying oven at 200°C for 14 hours, and then cool naturally to room temperature. The obtained product was washed several times with absolute ethanol and deionized water to remove soluble matter, and finally dried in a vacuum oven at 60° C. for 6 hours to obtain the product.

[0032] The chemical composition of the dried product was measured by X-ray photoelectron spectroscopy (XPS), and the molar ratio of Cu:In:S reached 1:1.03:1...

Embodiment 2

[0034] Same as Example 1, but the constant temperature reaction time is extended to 16h.

[0035] The products prepared under the same reaction conditions can be seen under the transmission electron microscope with more complete morphology, larger grain size and more obvious crystal phase. This is because the nuclei can grow larger with longer reaction times. At the same time, it shows that time has a great influence on the product morphology and crystal plane growth tendency. The chemical composition of the dried product was measured by X-ray photoelectron spectroscopy (XPS), and the molar ratio of Cu:In:S was 1.02:1:1.95.

Embodiment 3

[0037] Same as Example 1, but the constant temperature reaction temperature is reduced to 160°C.

[0038] The product prepared under the same conditions was detected and found that its morphology and composition did not change much, but the crystal phase changed greatly. The chemical composition of the dried product was measured by X-ray photoelectron spectroscopy (XPS), Cu:In : The molar ratio of S is 1.0:1.04:1.98, indicating that CuInS 2 The crystal phase of the crystal is very sensitive to the reaction temperature.

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Abstract

The invention relates to a method for preparing CuInS2 nanoparticles by solvent thermosynthesis using biomolecules, which comprises the following concrete steps: firstly, preparing a copper source solution, then adding an indium source into the solution, evenly mixing, and adding a sulfur source into the mixed solution; dropwise adding an inorganic alkaline solution to regulate the mixed solution to be weakly alkaline, and evenly stirring; and finally, putting the solution in a high-pressure reaction kettle, reacting at constant temperature for a period of time, cooling, washing with a solvent, and drying to obtain the CuInS2 nanoparticles. By using nontoxic biomolecule L-cysteine as the sulfur source, the invention avoids the emission of toxic gas and lowers the technique cost. The L-cysteine can be used as both a sulfur source and a guide agent for reaction, is favorable for generating products with special structure and pattern and excellent photovoltaic properties, and develops a new way for synthesizing other semiconductor photovoltaic materials.

Description

technical field [0001] The invention belongs to the field of nanomaterials and relates to a CuInS 2 Synthesis of nanoparticles. Background technique [0002] Currently prepared CuInS 2 Thin film methods include vacuum multi-component co-evaporation, radio frequency sputtering, post-sulfurization, spray pyrolysis, electrodeposition and other processes. Among them, the vacuum three-way co-evaporation technology is a technology that uses the saturated vapor pressure of the evaporation source at high temperature to co-deposit thin films. Although the technology is simple, the reaction speed is slow, it is not easy to control the flow rate in a large area, it is difficult to control the evaporation rate of each element and maintain the stability of the substrate temperature, and the repeatability of the experiment is poor, and the equipment investment is large. The sputtering method uses the positive ions generated by the ionization of the inert gas under the electric field to...

Claims

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Application Information

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IPC IPC(8): C01G15/00B82Y40/00
Inventor 向卫东蔡文胡杰赵寅生王晓明
Owner TONGJI UNIV
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