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Copper-zinc-tin-selenium nanocrystal and synthesis method thereof

A synthesis method and nanocrystal technology, applied in nanotechnology, selenium/tellurium compounds, chemical instruments and methods, etc., can solve the problems of difficult control, poor repeatability of the preparation process, increase cost, etc., and achieve easy control, novel structure, and cost. low cost effect

Active Publication Date: 2021-06-29
WENZHOU UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, most of these chemical preparation methods in the prior art require a variety of solvents, and all need to be protected with an inert gas
In this way, on the one hand, the cost is increased, and on the other hand, the reaction is not easy to control due to too many influencing factors.
Since CZTSe is a multi-component compound semiconductor, the precise atomic ratio and lattice matching require high process conditions, and the harsh process conditions make the repeatability of the preparation process poor.

Method used

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  • Copper-zinc-tin-selenium nanocrystal and synthesis method thereof
  • Copper-zinc-tin-selenium nanocrystal and synthesis method thereof
  • Copper-zinc-tin-selenium nanocrystal and synthesis method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0046] Weigh 3mmol of selenium dioxide and 3ml of oleylamine, put them into the first flask and mix them, and place the first flask in a collector heating mantle at 130°C. After reacting for 12min, cool to room temperature to obtain anion precursor solution ;

[0047] Put 1.32mmol copper acetylacetonate, 0.79mmol zinc acetylacetonate hydrate, 0.75mmol tin dichloroacetylacetonate and 4ml oleylamine into the second flask for mixing, and place the second flask in a constant temperature oil bath at 160°C , and reacted for 15 minutes under magnetic stirring to form a metal cation precursor solution;

[0048] Add the above-mentioned anion precursor solution to the metal cation precursor solution, and react in a constant temperature oil bath at 160°C for 90 minutes. After the end, cool down to room temperature naturally, and centrifuge the reacted solution. The precipitate was washed with n-hexane and centrifuged. After discarding the supernatant again, the precipitate was added to ...

Embodiment 2

[0056] Weigh 3mmol of selenium dioxide and 4ml of oleylamine, put them into the first flask and mix them, and place the first flask in a collector heating mantle at 120°C. After reacting for 15min, cool to room temperature to obtain anion precursor solution ;

[0057] Put 1.38mmol copper acetylacetonate, 0.82mmol zinc acetylacetonate hydrate, 0.75mmol tin dichloroacetylacetonate and 5ml oleylamine solution in a constant temperature oil bath at 160°C, and react for 20min under magnetic stirring to form a metal cation precursor solution ;

[0058] Add the above-mentioned anion precursor solution to the metal cation precursor solution, and react in a constant temperature oil bath at 160°C for 60 minutes. The precipitate was washed with n-hexane and centrifuged. After discarding the supernatant again, the precipitate was added to ethanol and centrifuged. This was repeated several times until the supernatant after centrifugation was colorless and transparent. The final precipitate...

Embodiment 3

[0061] Weigh 3mmol of selenium dioxide and 5ml of oleylamine, put them into the first flask and mix them, and place the first flask in a collector heating mantle at 130°C. After reacting for 12min, cool to room temperature to obtain anion precursor solution ;

[0062] Put 1.32mmol copper acetylacetonate, 0.79mmol zinc acetylacetonate hydrate, 0.75mmol tin dichloroacetylacetonate and 4ml oleylamine solution in a constant temperature oil bath at 165°C, and react for 15min under magnetic stirring to form a metal cation precursor solution ;

[0063] Add the above-mentioned anion precursor solution to the metal cation precursor solution, and react in a constant temperature oil bath at 165°C for 90 minutes. After the end, cool down to room temperature naturally, and centrifuge the reacted solution. The precipitate was washed with n-hexane and centrifuged. After discarding the supernatant again, the precipitate was added to ethanol and centrifuged. This was repeated several times un...

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Abstract

The invention discloses a copper-zinc-tin-selenium nanocrystal and a synthesis method thereof. The synthesis method comprises the following steps: by taking selenium dioxide as a selenium source, copper acetylacetonate as a copper source, a zinc acetylacetonate hydrate as a zinc source, tin dichloroacetylacetonate as a tin source and oleylamine as a ligand and a solvent, reacting oleylamine with selenium dioxide to form an anion precursor solution; and reacting copper acetylacetonate, a zinc acetylacetonate hydrate and tin dichloroacetylacetonate with oleylamine to form a metal cation precursor solution, and adding an anion precursor solution into the metal cation precursor solution to react to obtain the Cu2ZnSnSe4 nanocrystal. Under the specific reaction temperature and reaction time, the Cu2ZnSnSe4 nanocrystal with the regular round cake shape is prepared for the first time, the size is 50-100 nm, and the dispersity is good. Compared with a hot injection method, the method provided by the invention is simpler in process and low in cost.

Description

technical field [0001] The invention belongs to the field of photovoltaic materials, in particular to a copper-zinc-tin-selenium (Cu 2 ZnSnSe 4 ) nanocrystals and methods for their synthesis. Background technique [0002] With the development of society and economy, the energy crisis and environmental pollution problems are becoming more and more serious, all sectors of society pay more and more attention to the sustainable development of energy, especially clean and renewable energy has attracted the attention and favor of governments of all countries. As a new type of energy, solar energy has the characteristics of inexhaustible, inexhaustible, locally sourced and environmentally friendly. Solar cells are currently one of the important ways to utilize solar energy, and they are also one of the hotspots of people's research. The photoelectric conversion efficiency of current solar cells is low, which is far from the theoretical value, and the production cost is relatively...

Claims

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Application Information

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IPC IPC(8): C01B19/00B82Y40/00
CPCC01B19/002B82Y40/00C01P2002/72C01P2004/03C01P2002/84C01P2004/64
Inventor 邹超韩辉芳冯鹏宇翟兰兰杨云张礼杰黄少铭
Owner WENZHOU UNIVERSITY