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Preparation method of iodide ionic ligand PbS nanocrystal, iodide ionic ligand PbS nanocrystal ink and solar battery

A technology of solar cells and nanocrystals, which is applied in semiconductor/solid-state device manufacturing, circuits, photovoltaic power generation, etc., can solve problems hindering the industrialization of nanocrystal devices, and achieve the effect of reducing preparation costs, simple and fast methods, and reducing costs

Inactive Publication Date: 2019-07-23
SUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In addition, the cost of obtaining PbS nanocrystals by using this method of synthesis first and then ligand exchange is as high as more than 100 yuan per gram, which seriously hinders the industrialization of nanocrystal devices.

Method used

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  • Preparation method of iodide ionic ligand PbS nanocrystal, iodide ionic ligand PbS nanocrystal ink and solar battery
  • Preparation method of iodide ionic ligand PbS nanocrystal, iodide ionic ligand PbS nanocrystal ink and solar battery
  • Preparation method of iodide ionic ligand PbS nanocrystal, iodide ionic ligand PbS nanocrystal ink and solar battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Preparation of iodide ligand PbS nanocrystals:

[0029] 1) Preparation of precursor solution: Add 3.568 g (8 mmol) of lead iodide, 912 mg (4 mmol) of N,N-diphenylthiourea and 9 mL of N,N-dimethylformamide into a 50 mL single port In the flask, stir at room temperature until the precursor is completely dissolved to obtain a precursor solution for use; the molar ratio of lead iodide to N,N-diphenylthiourea is 2:1;

[0030] 2) Inject 1mL of butylamine into the one-necked flask, and continue stirring for 10 minutes. Transfer the reaction solution to a centrifuge tube, add toluene until the reaction solution becomes turbid, centrifuge at a speed of 8000 rpm, and discard the supernatant after centrifugation for 5 minutes; drain the product under vacuum to obtain the iodide ion ligand PbS nano Crystals, stored in the glove box. Its UV-Vis absorption spectrum is as figure 1 As shown, the photoluminescence spectrum as figure 2 shown.

Embodiment 2

[0032] Preparation of iodide ligand PbS nanocrystals:

[0033] 1) Preparation of precursor solution: Add 3.568 g (8 mmol) of lead iodide, 456 mg (2 mmol) of N,N-diphenylthiourea and 9 mL of N,N-dimethylformamide into a 50 mL single port In the flask, stir at room temperature until the precursor is completely dissolved to obtain a precursor solution for use; the molar ratio of lead iodide to N,N-diphenylthiourea is 4:1;

[0034] 2) Inject 1mL of butylamine into the one-necked flask, and continue stirring for 10 minutes. Transfer the reaction solution to a centrifuge tube, add toluene until the reaction solution becomes turbid, centrifuge at a speed of 8000 rpm, and discard the supernatant after centrifugation for 5 minutes; drain the product under vacuum to obtain the iodide ion ligand PbS nano Crystals, stored in the glove box. Its UV-Vis absorption spectrum is as figure 1 As shown, the photoluminescence spectrum as figure 2 shown.

Embodiment 3

[0036] Preparation of iodide ligand PbS nanocrystals:

[0037] 1) Preparation of precursor solution: Add 3.568 g (8 mmol) of lead iodide, 304 mg (1.33 mmol) of N,N-diphenylthiourea and 9 mL of N,N-dimethylformamide into a 50 mL single port In the flask, stir at room temperature until the precursor is completely dissolved to obtain a precursor solution for use; wherein the molar ratio of lead iodide to N,N-diphenylthiourea is 6:1;

[0038] 2) Inject 1mL of butylamine into the one-necked flask, and continue stirring for 10 minutes. Transfer the reaction solution to a centrifuge tube, add toluene until the reaction solution becomes turbid, centrifuge at a speed of 8000 rpm, and discard the supernatant after centrifugation for 5 minutes; the product is dried under vacuum to obtain the iodide ion ligand PbS nano Crystals, stored in the glove box. Its UV-Vis absorption spectrum is as figure 1 As shown, the photoluminescence spectrum as figure 2 As shown, the transmission electr...

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Abstract

The invention discloses a preparation method of an iodide ionic ligand PbS nanocrystal, iodide ionic ligand PbS nanocrystal ink and a solar battery. According to the preparation method, a Pbs nanocrystal passivated by a iodide ionic ligand is synthesized directly at one step under the action of butyl amine by taking lead iodide and N,N-thiocarbanilide as precursors and taking N,N-dimethyl formamide as a solvent, so that the preparation process flow is simplified, and the synthetic preparation cost and device preparation cost of the nanocrystal are lowered. The iodide ionic ligand Pbs nanocrystal provided by the invention can be dissolved in N,N-dimethyl formamide and other solvents to obtain iodide ionic ligand PbS nanocrystal ink of which the nanocrystal absorption peak is adjustable within a range of 850 to 1100 nanometers. Meanwhile, when a N,N-dimethyl formamide solution of the PbS nanocrystal passivated by the iodide ionic ligand is used for preparing a solar battery, the device performance which is comparable to solution phase ligand exchange can be achieved.

Description

technical field [0001] The invention belongs to the technical field of functional materials, and particularly relates to a method for synthesizing iodide ion ligand PbS nanocrystals by a one-step method, and iodide ion ligand PbS nanocrystal inks and solar cells prepared by using the iodide ion ligand PbS nanocrystals. Background technique [0002] The PbX (X=S, Se, Te) of Group IV-IV has a large Bohr radius, which makes their quantum confinement effect particularly significant. Through size adjustment, the band gap of nanocrystalline materials can be greatly adjusted, and Its absorption spectrum matches well with the solar spectrum reaching the earth's surface, and it also has properties such as large absorption coefficient, high electron mobility, and adjustable energy level, making IV-IV nanocrystals the most popular photovoltaic nanocrystals in current research. material, which is expected to become a low-cost and high-efficiency solar cell for a new generation of soluti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G21/21H01L51/42H01L51/46
CPCC01G21/21C01P2002/84C01P2002/72C01P2004/04C01P2006/40H10K30/10H10K2102/00Y02E10/549
Inventor 马万里汪永杰
Owner SUZHOU UNIV
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