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Self-assembly growth method of array heterojunction

A heterojunction, self-assembly technology that can be used in sustainable manufacturing/processing, electrical components, climate sustainability, etc., and can solve problems such as poor controllability

Active Publication Date: 2020-10-23
CHANGSHU INSTITUTE OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

It can be seen from this that array heterojunctions have made important contributions in the fields of photoelectrocatalysis and photodetection, but the growth of these array heterojunctions we listed above mainly focuses on the growth of heterojunctions by hydrothermal method, which is controllable Sex is not strong
So far, there is no published method to obtain a general method for the controllable growth of arrayed heterojunctions

Method used

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  • Self-assembly growth method of array heterojunction

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Implementation routes such as figure 1 As shown, the specific steps are as follows:

[0027] a. Take a certain amount of PSS (average molecular weight 70,000) powder and add it to the ethanol solution, prepare a PSS solution with a mass concentration of 5%, and stir it well at room temperature to make it uniform.

[0028] b. Titanium dioxide array column grown by hydrothermal method (see Energy Environ. Sci., 2016,9, 2633) (eg figure 2 (a) and image 3 The morphology shown in (a)) was soaked in the above PSS solution, placed on a flat heater and heated at 90°C for 2 hours, and then naturally cooled to room temperature and dried to form a PSS-modified array substrate.

[0029] c. Add nickel chloride to an aqueous solution containing PEI (branched polyethyleneimine, with an average molecular weight of 10 000) (the mass fraction of PEI is 20%-40%) and stir to make it fully react, PEI and metal ions pass through the complex A stable coordination compound is formed in a ...

Embodiment 2

[0033] a. Clean and dry the titanium dioxide array column grown by hydrothermal method (see Energy Environ. Sci., 2016, 9, 2633) and dry it for use.

[0034] b. Add nickel chloride to an aqueous solution containing PEI (branched polyethyleneimine, average molecular weight 10 000) (the mass fraction of PEI is 20%-40%) and stir to make it fully react, PEI and metal ions pass through the complex A stable coordination compound is formed in a combined way, and after a full reaction, the solution passes through an ultrafiltration device (if the molecular weight is greater than the molecular weight of the filter membrane, it cannot pass through the filter membrane, and if the molecular weight is smaller than the molecular weight of the filter membrane, it can be filtered out) There will be no complexed The nickel ions are filtered out to form the final precursor solution of nickel. The final precursor solution is uniform and stable at the molecular level. The viscosity and concentrati...

Embodiment 3

[0038] The specific steps are as follows:

[0039] a. Take a certain amount of PSS (average molecular weight: 70,000) powder and add it to the ethanol solution, configure a PSS solution with a mass fraction of 5%, and fully stir it at room temperature to make it uniform;

[0040] b. Soak the titanium dioxide array column grown by the hydrothermal method (see Energy Environ. Sci., 2016, 9, 2633) in the above PSS solution, place it on a flat heater and heat it at 90°C for 2 hours, and then cool down naturally to Dry at room temperature to form a PSS-modified array substrate;

[0041] c. Add zinc nitrate to an aqueous solution containing PEI (branched polyethyleneimine, average molecular weight 10 000) (the mass fraction of PEI is 20%-40%) and stir to make it fully react. The filter device (if the molecular weight is greater than the molecular weight of the filter membrane, it cannot pass through the filter membrane, and if the molecular weight is smaller than the molecular weig...

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Abstract

The invention discloses a self-assembly growth method of an array heterojunction. The method comprises the following steps: preparing a PSS solution; soaking an array substrate in the PSS solution toform a PSS-modified array substrate which shows electronegativity; preparing a polyethyleneimine-assisted metal ion precursor solution to form a positively-charged ion group; dropwise adding the precursor solution onto the PSS-modified array substrate, and adsorbing the precursor solution onto the surface of the array under the adsorption action of positive and negative groups; and carrying out heat treatment to form a stable and firm heterojunction array. The invention discloses the self-assembly growth method of the array heterojunction for the first time, wherein the stable heterojunction is formed after the metal ion precursor solution and the surface of the array are connected and subjected to heat treatment through positive and negative attraction effect between the PSS-modified electronegative array substrate and the PEI-assisted ionic-group-electropositive metal ion precursor solution. According to the self-assembly growth method, the surface of the heterojunction formed through the method is uniform, controllability is high, and a selectable universal method is provided for growth of the heterojunction.

Description

technical field [0001] The invention belongs to the technical field of semiconductor heterojunction, and relates to a self-assembled growth method of an array heterojunction thin film, and more specifically to a metal ion precursor solution assisted by sodium polystyrene sulfonate and polyethyleneimine A method for growing a heterojunction thin film on the surface of an array substrate. Background technique [0002] Nanoarrays such as TiO 2 , ZnO and other arrays have a unique structure, large specific surface area, higher light capture efficiency, and higher quantum effects compared to flat films. They have a wide range of applications in solar cells, light-emitting devices, and photocatalysis. application. However, a single material has its own defects. Growing another material on the surface of the array to form an array heterojunction can combine the advantages of the two, learn from each other, and even play a role that the original material does not have due to the u...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01L31/0264H01L31/0336H01L31/0352H01L31/18
CPCH01L31/0264H01L31/0336H01L31/0352H01L31/18Y02P70/50
Inventor 易庆华丛姗刘玉申
Owner CHANGSHU INSTITUTE OF TECHNOLOGY
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