Lead sulfide film with broad absorption spectrum and preparation method thereof

A technology of absorption spectrum and lead sulfide, which is applied in the field of lead sulfide film with wide absorption spectrum and its preparation, can solve the problems of not being able to obtain products with broad-band absorption characteristics and restricting applications, and achieve simple and easy-to-operate processes and scientific preparation methods Effect

Active Publication Date: 2020-12-08
HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this thin-film product has blue-shifted its light absorption edge to the ultraviolet band, there are shortcomings in both the preparation method and the product. First, the light absorption peak of the product is limited to the range of 300-600nm, which limits the application occasions; Secondly, the preparation method cannot obtain products with broadband absorption characteristics

Method used

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  • Lead sulfide film with broad absorption spectrum and preparation method thereof
  • Lead sulfide film with broad absorption spectrum and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0037] The concrete steps of preparation are:

[0038] Step 1, according to the volume ratio of 1.5mol / L sodium hydroxide solution, 2.1mol / L thiourea solution, 7mol / L triethanolamine, 0.6mol / L lead acetate solution and deionized water is 5:4:0.2 : 6:70 ratio, first add sodium hydroxide solution, thiourea solution and triethanolamine to lead acetate solution in sequence to obtain a mixed solution; then add deionized water to the mixed solution to obtain a reaction solution.

[0039] In step 2, first place the substrate in a stirred reaction solution at 70° C. for 4 hours to obtain a substrate with reactants placed on its surface; wherein, the substrate is a glass substrate, and the stirring rate is 200 r / min. Then, the substrate with the reactant placed on its surface is cleaned and dried; wherein, the cleaning is washed twice with deionized water, and the drying is natural drying. made as figure 1 and figure 2 The broad absorption spectrum of the lead sulfide thin film sho...

Embodiment 2

[0041] The concrete steps of preparation are:

[0042] Step 1, according to the volume ratio of 1.55mol / L sodium hydroxide solution, 2.05mol / L thiourea solution, 7.2mol / L triethanolamine, 0.55mol / L lead acetate solution and deionized water is 5.5:3.5: The ratio of 0.25:5.5:70, first add sodium hydroxide solution, thiourea solution and triethanolamine to the lead acetate solution in sequence to obtain a mixed solution; then add deionized water to the mixed solution to obtain a reaction solution.

[0043] In step 2, first place the substrate in a stirred reaction solution at 73° C. for 3.5 hours to obtain a substrate with reactants placed on its surface; wherein, the substrate is a glass substrate, and the stirring rate is 210 r / min. Then, the substrate with the reactant placed on its surface is cleaned and dried; wherein, the cleaning is washed twice with deionized water, and the drying is natural drying. made as figure 1 and figure 2 The broad absorption spectrum of the le...

Embodiment 3

[0045] The concrete steps of preparation are:

[0046] Step 1, according to the volume ratio of 1.6mol / L sodium hydroxide solution, 2mol / L thiourea solution, 7.3mol / L triethanolamine, 0.5mol / L lead acetate solution and deionized water is 6:3:0.3 : The ratio of 5:70, first add sodium hydroxide solution, thiourea solution and triethanolamine to the lead acetate solution in sequence to obtain a mixed solution; then add deionized water to the mixed solution to obtain a reaction solution.

[0047] In step 2, first place the substrate in a stirred reaction solution at 75° C. for 3 hours to obtain a substrate with reactants placed on its surface; wherein, the substrate is a glass substrate, and the stirring rate is 220 r / min. Then, the substrate with the reactant placed on its surface is cleaned and dried; wherein, the cleaning is cleaned three times with deionized water, and the drying is natural drying. made as figure 1 and figure 2 The broad absorption spectrum of the lead sul...

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Abstract

The invention discloses a lead sulfide thin film with the wide absorption spectrum and a preparation method of the lead sulfide thin film. The thickness of the thin film is 500-540nm. The particle diameter of each lead sulfide crystal grain is 6-10nm. At the wave band of 450-220nm, the thin film consisting of the lead sulfide crystal grains the diameter of each of which 6-10nm displays an absorption peak. According to the invention, by use of the chemical vapour deposition method: firstly successively adding the sodium hydroxide solution, the thiourea solution and the triethanolamine solution into the lead acetate solution so as to obtain a mixed solution; then adding the deionized water into the mixed solution to obtain a reaction solution; arranging a substrate into the stirred reaction solution of the 70 DEG C-80 DEG C for at least 2h so as to obtain the substrate with the reagent on the surface; and cleaning and drying the substrate with the reagent on the surface to prepare the target product. According to the invention, the thin film has the quite wide wave band absorption characteristic, and is quite easily, widely and commercially applicable to field of photodetection, solar energy coating absorption layers and gas sensing detection.

Description

technical field [0001] The invention relates to a lead sulfide film and a preparation method thereof, in particular to a lead sulfide film with a wide absorption spectrum and a preparation method thereof. Background technique [0002] Lead sulfide (PbS) is an important IV-VI semiconductor material, because of its large Bohr exciton radius (18nm) and small intrinsic bandgap (0.41eV), it is in the near-infrared spectral region ( 1-3μm) has a very good response effect; therefore, lead sulfide has important applications in the fields of infrared sensing and detection. At the same time, lead sulfide also has a large nonlinear optical coefficient, and the film is uniform and fine, and has excellent properties such as corrosion resistance, high temperature resistance, and oxidation resistance. In recent years, people have made some beneficial attempts and efforts in the research and development of lead sulfide nanomaterials based on the special properties of nanomaterials that are...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B5/22G02B1/10C01G21/21
CPCC01G21/21C01P2002/72C01P2002/84G02B1/10G02B5/22
Inventor 费广涛谢秉合许少辉
Owner HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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