Synthesis method of stably dispersed near-infrared Ag2X nanocrystal colloidal solution

A technology of colloidal solution and synthesis method, which is applied in chemical instruments and methods, electric solid devices, semiconductor devices, etc., can solve problems such as the inability to meet the needs of solar cells, and achieve the effect of improving ligand density and increasing binding energy.

Pending Publication Date: 2022-05-27
WESTLAKE UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the existing Ag 2 X nanocrystals can't meet the needs of solar cells

Method used

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  • Synthesis method of stably dispersed near-infrared Ag2X nanocrystal colloidal solution
  • Synthesis method of stably dispersed near-infrared Ag2X nanocrystal colloidal solution
  • Synthesis method of stably dispersed near-infrared Ag2X nanocrystal colloidal solution

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Example 1: Adding Bi 3+ Modified Ag 2 S nanocrystal synthesis

[0034] In a 50 mL three-neck round bottom flask, 1.0 mmol silver nitrate, 1.0 mmol bismuth chloride, 1.0 mL oleic acid, 1.0 mL oleylamine and 8.0 mL octadecene were added. The flask was heated to 115°C and evacuated for 30 minutes to remove air and moisture from the system. Then, argon was introduced, the temperature was raised to 170° C., 0.45 mmol of p-diphenylthiourea (0.1 M dissolved in diphenyl ether, 4.5 mL) was injected, and the temperature was lowered to room temperature after 30 minutes of reaction. The resulting solution was centrifuged to remove the precipitate, washed with toluene and acetonitrile at least three times, and dispersed in a non-polar solvent.

[0035] like Figure 9 shown in the reference bottle is Ag with no heterovalent cation modification on the surface 2 State of S nanocrystals in a nonpolar solvent, BiCl 3 Add Bi to the bottle 3+ Modified Ag 2 S nanocrystals can be wel...

Embodiment 2

[0036] Example 2: Addition of Zn 2+ Modified Ag 2 S nanocrystal synthesis

[0037] In a 50 mL three-neck round bottom flask, 1.0 mmol silver nitrate, 0.1 mmol zinc chloride, 1.0 mL oleic acid, 1.0 mL oleylamine and 8.0 mL octadecene were added. The flask was heated to 115°C and evacuated for 30 minutes to remove air and moisture from the system. Then, argon was introduced, the temperature was raised to 170° C., 0.45 mmol of p-diphenylthiourea (0.1 M dissolved in diphenyl ether, 4.5 mL) was injected, and the temperature was lowered to room temperature after 30 minutes of reaction. After washing with toluene and acetonitrile at least three times, it is dispersed in a non-polar solvent.

[0038] like Figure 9 shown in the reference bottle is Ag with no heterovalent cation modification on the surface 2 State of S nanocrystals in a non-polar solvent, ZnCl 2 Add Zn to the bottle 2+ Modified Ag 2 S nanocrystals can be well dispersed in non-polar solvents, so this sample can ...

Embodiment 3

[0039] Example 3: Adding Ga 3+ Modified Ag 2 S nanocrystal synthesis

[0040] In a 50 mL three-neck round bottom flask, 1.0 mmol of silver nitrate, 1 mmol of gallium chloride, 1.0 mL of oleic acid, 1.0 mL of oleylamine and 8.0 mL of octadecene were added. The flask was heated to 115°C and evacuated for 30 minutes to remove air and moisture from the system. Then, argon was introduced, the temperature was raised to 170° C., 0.45 mmol of p-diphenylthiourea (0.1 M dissolved in diphenyl ether, 4.5 mL) was injected, and the temperature was lowered to room temperature after 30 minutes of reaction. After washing with toluene and acetonitrile at least three times, it is dispersed in a non-polar solvent.

[0041] like Figure 9 shown in the reference bottle is Ag with no heterovalent cation modification on the surface 2 State of S nanocrystals in a nonpolar solvent, GaCl 3 Add Ga to the bottle 3+ Modified Ag 2 S nanocrystals can be well dispersed in non-polar solvents, and this ...

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Abstract

The invention provides a method for synthesizing a stably dispersed near-infrared Ag2X nanocrystal colloidal solution, which comprises the following steps of: injecting an X precursor solution into an Ag precursor solution containing isovalent halide at a certain reaction temperature in an inert gas environment, keeping the temperature for a period of time, cooling to room temperature, washing for multiple times, and dispersing in a non-polar solvent. The Ag2X nanocrystal colloidal solution prepared by the method does not contain strong coordination ligands, and the highly dispersed near-infrared Ag2X nanocrystal with the surface rich in cations is prepared by adopting a heterovalent metal modification method. The key point of the method is that metal cations are introduced in situ, metal halide does not react with an X precursor, and the ligand density is remarkably improved by the heterovalent cations on the surface of the nanocrystal because the binding energy of the heterovalent cations and organic ligands is increased. The high-concentration Ag2X nanocrystalline ink prepared by the method can be used as a light absorption layer of a high-efficiency solid-state solar cell, and has potential application in the fields of near-infrared biological imaging, medical treatment and the like.

Description

technical field [0001] The invention relates to the technical field of new materials, in particular to a stably dispersed near-infrared Ag 2 X nanocrystal colloidal solution synthesis method. Background technique [0002] Colloidal semiconductor nanocrystals, with their size-tunable band gaps and solution processability, have attracted extensive attention in the field of solar cells. Stable nanocrystal solutions are usually synthesized in organic high-boiling solvents and consist of inorganic nanocrystal cores and organic ligands. During synthesis, surface ligands play important roles in regulating nucleation and growth kinetics, passivating surface dangling bonds, and maintaining colloidal stability in nonpolar solvents. [0003] As a class of direct bandgap semiconductors, environmentally friendly Ag 2 X (X=S, Se, Te) nanocrystalline colloids are used as light-absorbing layer materials for solar cells. Hydrophobic Ag 2 The surface of X nanocrystals usually adsorbs lig...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/02C09K11/58C09K11/62C09K11/74H01L51/42H01L51/46
CPCC09K11/582C09K11/7407C09K11/621C09K11/025H10K30/30H10K2102/00Y02E10/549
Inventor 冀波涛柳佃义张婕妤
Owner WESTLAKE UNIV
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