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Preparation of graphene-coated silver powder by hydrothermal method and preparation method of graphene-coated silver powder modified lead-free slurry

A technology of graphene coating and hydrothermal method, which is applied in the direction of photovoltaic power generation, metal/alloy conductors, electrical components, etc., can solve the problem of reducing the effective contact of silver particles, conductive paste containing metal lead and expensive, and increasing electrode series resistance and other problems, to achieve the effect of reducing recombination probability, improving photoelectric conversion efficiency, and enhancing open circuit voltage

Active Publication Date: 2018-01-02
NORTHWEST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to solve the problem that the particle size of the silver powder used in the existing front-side silver paste is micron, and there are a large number of gaps in the middle of the silver powder, which reduces the effective contact between the silver particles, increases the series resistance of the electrode and the existing crystalline silicon. The conductive paste required for solar cells contains metallic lead and is expensive, and the preparation method of hydrothermal graphene-coated silver powder and the preparation method of graphene-coated silver powder modified lead-free paste are provided

Method used

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  • Preparation of graphene-coated silver powder by hydrothermal method and preparation method of graphene-coated silver powder modified lead-free slurry
  • Preparation of graphene-coated silver powder by hydrothermal method and preparation method of graphene-coated silver powder modified lead-free slurry
  • Preparation of graphene-coated silver powder by hydrothermal method and preparation method of graphene-coated silver powder modified lead-free slurry

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specific Embodiment approach 1

[0054] Specific embodiment one: present embodiment is to utilize hydrothermal method to prepare the method for graphene-coated silver powder, specifically completes according to the following steps:

[0055] 1. Preparation of silver powder:

[0056] ①. Mixing a silver nitrate solution with a concentration of 30g / L to 500g / L and a dispersant solution with a concentration of 10g / L to 100g / L to obtain a silver nitrate solution containing a dispersant;

[0057] The concentration described in step 1. is that the volume ratio of the dispersant solution of 10g / L~100g / L and the silver nitrate solution of 30g / L~500 / L is (0.3~3):1;

[0058] ②. Dissolving the reducing agent in distilled water to obtain a reducing agent solution;

[0059] The concentration of the reducing agent solution described in step 1.2 is 50g / L~150g / L;

[0060] ③. Mix the reducing agent solution with the silver nitrate solution containing the dispersant, then react at a stirring speed of 100r / min to 200r / min and a...

specific Embodiment approach 2

[0078] Specific embodiment two: the difference between this embodiment and specific embodiment one is: the dispersant in the dispersant solution described in step one 1. is gelatin, polyvinylpyrrolidone, N-methylpyrrolidone, polyvinyl alcohol, triethanolamine , trisodium citrate and gum arabic, or a mixture of several of them. Others are the same as the first embodiment.

specific Embodiment approach 3

[0079] Embodiment 3: The difference between this embodiment and Embodiment 1 or 2 is that the reducing agent described in step 1.2 is one of ascorbic acid, hydrazine hydrate and hydroquinone or a mixture of several of them. Others are the same as those in Embodiment 1 or 2.

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Abstract

Preparation of graphene-coated silver powder by hydrothermal method and preparation method of graphene-coated silver powder modified lead-free slurry. The invention relates to a preparation method of graphene-coated silver powder and its use to prepare slurry and preparation of slurry. method. The purpose of the present invention is to solve the problem that the particle size of the silver powder used in the existing positive silver slurry is micron level, and there are a large number of gaps in the middle of the silver powder, which reduces the effective contact between the silver particles and increases the series resistance of the electrode and the existing crystalline silicon The conductive paste required for solar cells contains metallic lead and is expensive. Preparation method of graphene-coated silver powder: 1. Preparing silver powder; 2. Preparing graphene oxide; 3. Preparing graphene-coated silver powder through hydrothermal reaction. The graphene-coated silver powder modified lead-free slurry is prepared by weight parts from 50 to 95 parts of graphene-coated silver powder, 1 to 20 parts of glass powder and 10 to 20 parts of organic carrier; the present invention can obtain Graphene-coated silver powder and its modified lead-free paste.

Description

technical field [0001] The invention relates to a preparation method of graphene-coated silver powder and a slurry prepared by using the same and a preparation method of the slurry. Background technique [0002] Silver electronic paste is widely used in many fields in the electronics industry, such as thick film integrated circuits, ceramic capacitors, plasma flat panel displays, because of its conductive phase metal silver, which has a lower resistivity than other metals and is also the cheapest among precious metals. , silicon solar cells, etc. Silver powder is the main component of conductive silver paste, and the conductivity of the electrode is mainly reflected by it. Graphene is composed of a dense layer of carbon atoms wrapped in a honeycomb crystal lattice. It is the thinnest two-dimensional material in the world, with a thickness of only 0.35nm. This special structure contains rich and novel physical phenomena, which make graphene exhibit excellent electrical and ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01B1/02H01L31/0224
CPCH01B1/02H01L31/022425Y02E10/50
Inventor 王惠白晋涛王憨英马生华
Owner NORTHWEST UNIV
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