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Fabrication method of lead sulfide quantum dot

A technology of lead sulfide and quantum dots, which is applied in the field of solar cells, can solve problems such as unsuitable for large-scale production, high price, and toxicity, and achieve the effects of safe and non-toxic preparation methods, mild reaction conditions, and good monodispersity

Inactive Publication Date: 2016-11-16
ZHONGYUAN ENGINEERING COLLEGE
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although PbS quantum dots can be prepared under aqueous conditions by using surfactants-thioglycerol (TGL) and dithioglycerol or dihydrolipoic acid (DHLA), such stabilizers are expensive, and Toxic, not suitable for large-scale production

Method used

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  • Fabrication method of lead sulfide quantum dot
  • Fabrication method of lead sulfide quantum dot

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preparation example Construction

[0025] A preparation method of lead sulfide quantum dots, comprising the steps of:

[0026] a. Prepare additives according to the amount of substances: 20-30 parts of cetyltrimethylammonium bromide, 20-30 parts of sodium lauryl sulfate, 40-60 parts of sodium citrate;

[0027] b. Add the above-mentioned mixing aids into water at a temperature of 50°C~70°C, and continue to stir at high speed for 3~5 minutes to completely dissolve it, and prepare a mixed solution;

[0028] c. Add a few drops of dilute nitric acid solution to the above mixed solution, adjust the pH value to 3~5, then add sodium citrate to the solution, the amount of sodium citrate is 2~4 times that of lead acetate, the solution lasts Stir at high speed for 1-2 min until it turns into a light yellow solution;

[0029] d. Continue to slowly add sodium citrate, the amount of sodium citrate is 2 to 4 times that of thiourea, the solution continues to stir at high speed for 3 to 5 minutes, and the color of the solution...

Embodiment 1

[0039] 1) Weigh 18.2 mg (0.05 mmol) of cetyltrimethylammonium bromide, 14.4 mg (0.05 mmol) of sodium lauryl sulfate and 29.4 mg (0.1 mmol) of sodium citrate respectively, and add them to 50 mL of water In a beaker at 60°C, stir continuously at high speed for 3-5 minutes to dissolve completely;

[0040] 2) Add a few drops of dilute nitric acid solution to the above mixed solution, and adjust the pH value to 4 with a pH meter, then add 5 mL of 0.05mol / L lead acetate solution and continue stirring at high speed for 2 minutes, at this time the solution turns light yellow;

[0041] 3) Slowly add 10 mL of thiourea solution with a concentration of 0.025 mol / L and continue to stir at high speed for 4 min, the color of the solution gradually changes from orange to brown.

[0042] 4) After cooling the mixed solution obtained above at room temperature, centrifuge, wash with deionized water and absolute ethanol three times respectively, and store the obtained lead sulfide in absolute etha...

Embodiment 2

[0044] 1) Weigh 36.4 mg (0.1 mmol) of cetyltrimethylammonium bromide, 28.8 mg (0.1 mmol) of sodium lauryl sulfate and 58.8 mg (0.2 mmol) of sodium citrate respectively, and add them to 100 mL of water temperature In a beaker at 70°C, stir continuously at high speed for 3-5 minutes to dissolve completely;

[0045] 2) Add a few drops of dilute nitric acid solution to the above mixed solution, and adjust the pH value to 5 with a pH meter, then add 40ml 0.05mol / L thiourea solution and continue stirring at high speed for 2 minutes;

[0046] 3) Slowly add 80 mL of lead acetate solution with a concentration of 0.025 mol / L and continue to stir at a high speed for 3 minutes, the color of the solution gradually changes from light yellow or orange yellow to brown, which means the formation of PbS quantum dots;

[0047]4) After cooling the mixed solution obtained above at room temperature, centrifuge, wash with deionized water and absolute ethanol three times respectively, and store the o...

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Abstract

The invention discloses a fabrication method of a lead sulfide quantum dot. The lead sulfide quantum dot having favorable monodispersity and with a size of about 3-5 nanometers is fabricated by a water-bath heating method. By a lead sulfide quantum dot material, the energy loss of transmission light and long-wavelength incident light can be reduced, the utilization ratio of a solar cell in a whole solar spectral range is improved, and the photoelectric conversion efficiency of the solar cell is further improved. The method is simple, is easy to operate, is low in cost and can be used for fabrication and production in a large scale.

Description

technical field [0001] The invention relates to the technical field of solar cells, in particular to a preparation method of lead sulfide quantum dots. Background technique [0002] At present, in the case of decreasing fossil fuels and increasing greenhouse effect, solar energy has become an important part of energy used by human beings. Solar energy is clean and pollution-free and has abundant reserves. Solar energy is a clean and non-polluting renewable energy with abundant reserves and no geographical restrictions. It is used to replace the fossil energy that is about to be exhausted, and can solve the impact of China's low-carbon economy. Among all kinds of new solar cells, the combination of quantum dots and up-conversion luminescent materials has become a research hotspot in the field of solar cells due to its low cost, simple manufacturing process, and relatively high photoelectric conversion efficiency. [0003] Quantum dots (QDs), also known as nanocrystals, are ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01L31/032H01L31/0352C01G21/21B82Y30/00
CPCB82Y30/00C01G21/21C01P2002/72C01P2004/04C01P2004/64H01L31/0324H01L31/035218
Inventor 焦岳超瞿博阳张朋刘萍朱永胜武明义
Owner ZHONGYUAN ENGINEERING COLLEGE
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