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Silver paste for back face of lead-free crystal silicon solar cell and preparation method thereof

A technology of solar cells and crystalline silicon, applied in the manufacture of cables/conductors, conductive materials dispersed in non-conductive inorganic materials, circuits, etc., can solve the problem of poor adhesion between silver electrodes and silicon substrates, environmental and human toxicity, The problem of high battery scrap rate, to achieve the effect of good weldability, less harm to human body and environment, and beneficial to industrial production

Inactive Publication Date: 2012-02-29
NINGBO GUANGBO NEW NANOMATERIALS STOCK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] (1) The organic binder in the slurry contains toxic substances. The common toxic substances are Pb, Cr, etc. During the preparation process, the volatilization is serious, the efficiency is low, and it is harmful to the human body. dangerous;
[0006] (2) Inorganic adhesive metal glass powder contains lead and other toxic elements, which are harmful to the environment and human body to a certain extent;
[0007] (3) The adhesion between the silver electrode and the silicon substrate is not strong, and the cell scrap rate is high

Method used

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  • Silver paste for back face of lead-free crystal silicon solar cell and preparation method thereof
  • Silver paste for back face of lead-free crystal silicon solar cell and preparation method thereof
  • Silver paste for back face of lead-free crystal silicon solar cell and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] 1. Silver powder

[0028] Spherical silver powder with a purity of 99.95% and an average particle size of 0.86 μm was made by physical vapor phase method.

[0029] 2. Preparation of modified organic binder

[0030] Weigh 50% terpineol, 17% benzyl alcohol, 20% butyl carbitol acetate, 5% ethyl cellulose, 3.5% organosilicon compound, 2% hydrogenated castor oil, 2.5% The above-mentioned sorbitan stearate is mixed and heated to 80-100°C to dissolve for 100 minutes to obtain a transparent colloid with good lubricity and printability.

[0031] 3. Preparation of lead-free glass powder

[0032] By mass percentage 25% of B 2 o 3 , 40% Bi 2 o 3， 15% SiO2 2 , 10% Al 2 o 3 , 6% ZnO, 2% V 2 o 5 , prepared from 2% ZrO. After mixing evenly with a mixer, put it into a ceramic crucible, dry it in an oven at 150°C for 2h, put it in a muffle furnace, melt it at 1000-1200°C for 1h, and water quench (the industry’s conventional water quenching process, Example 2- 3 is the sam...

Embodiment 2

[0040] 1. Silver powder

[0041] Spherical silver powder with a purity of 99.95% and an average particle size of 0.86 μm was made by physical vapor phase method.

[0042] 2. Preparation of modified organic binder

[0043] 48% terpineol, 17% benzyl alcohol, 18.5% butyl carbitol acetate, 8% ethyl cellulose, 1.5% organosilicon compound, 3.5% sorbitan stearate, 1.5% hydrogenated castor oil and 2% additives are mixed and heated to 80-100°C to dissolve for 100 minutes to obtain a transparent colloid with good lubricity and printability.

[0044] 3. Preparation of lead-free glass powder

[0045] 15% B 2 o 3 , 45% Bi 2 o 3， 12% SiO2 2 , 15% Al 2 o 3 , 6% ZnO, 5% V 2 o 5 , prepared from 2% ZrO. After mixing evenly with a mixer, put it into a ceramic crucible, dry it in an oven at 150°C for 2 hours, put it in a muffle furnace, melt it at 1000-1200°C for 1 hour, and dry it after water quenching, then use a planetary ball mill for 3 hours, and dry it A lead-free metallic glas...

Embodiment 3

[0053] 1. Silver powder

[0054]Spherical silver powder with a purity of 99.95% and an average particle size of 0.10 μm was made by physical vapor phase method.

[0055] 2. Preparation of modified organic binder

[0056] 49% terpineol, 18% benzyl alcohol, 16.5% butyl carbitol acetate, 7.5% ethyl cellulose, 1.5% organosilicon compound, 3.5% sorbitan stearate, 1.0% hydrogenated castor oil, 3% additives, the above materials are mixed and heated to 80-100 ℃ to dissolve for 100 minutes to obtain a transparent colloid with good lubricity and printability.

[0057] 3. Preparation of lead-free glass powder

[0058] 12% B 2 o 3 , 50% Bi 2 o 3， 8% SiO 2 , 12% Al 2 o 3 , 6% ZnO, 8% V 2 o 5 , prepared from 4% ZrO. After mixing evenly with a mixer, put it into a ceramic crucible, dry it in an oven at 150°C for 2 hours, put it in a muffle furnace, melt it at 1000-1200°C for 1 hour, and dry it after water quenching, then use a planetary ball mill for 3 hours, and dry it A lead-f...

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Abstract

The invention discloses silver paste for the back face of a lead-free crystal silicon solar cell. The paste is characterized by being prepared from the following components in percentage by weight: 55-84 percent of silver powder, 15-38 percent of modified organic bonding agent and 1-10 percent of inorganic bonding agent. The invention further discloses a preparation method of the silver paste forthe back face of the lead-free crystal silicon solar cell. The silver paste has the advantages of excluding of toxic substances such as lead and the like, small damage to human bodies and realizationof high adhesion between a silver electrode and a silicon substrate.

Description

technical field [0001] The invention relates to the technical field of back silver paste for solar cells, in particular to a back silver paste for lead-free crystalline silicon solar cells and a preparation method thereof. Background technique [0002] With the increasing emphasis on the environment and the increasing shortage of traditional energy sources around the world, the photovoltaic industry represented by crystalline silicon solar cells has developed rapidly in recent years. The silver paste on the back of the crystalline silicon solar cell is the main component of the solar electronic paste. It is used as the back electrode of the solar cell and mainly plays the role of collecting current. [0003] The silver paste on the back of crystalline silicon solar cells is mainly composed of silver powder, organic binder and inorganic binder. As the functional phase in the paste, the silver powder plays the role of conduction. Since the back silver electrode needs to be w...

Claims

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Application Information

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IPC IPC(8): H01B1/22H01B13/00H01L31/0224
Inventor 宋财根董政楼凯王利平
Owner NINGBO GUANGBO NEW NANOMATERIALS STOCK
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