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Electrode slurry for heterojunction solar cell and preparation method thereof

A technology for solar cells and electrode pastes, applied to conductive materials dispersed in non-conductive inorganic materials, cable/conductor manufacturing, circuits, etc., can solve the problems of reduced conversion efficiency, low conductivity, and high cost, and achieve resistivity Low, cost reduction effect

Active Publication Date: 2020-04-21
INST OF ELECTRICAL ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The performance of the electrode paste is directly related to the quality of the grid electrode of the solar cell, thus affecting the conversion efficiency of the solar cell
At present, the electrode paste used for heterojunction solar cells still has the following problems: (1) low conductivity, resulting in large series resistance of the cell, and lower conversion efficiency; (2) high cost, generally pure silver powder is used as the main raw material

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0036] The present invention also provides a method for preparing electrode paste for heterojunction solar cells described in the above technical solution, comprising the following steps:

[0037] 1) mixing the soluble copper salt, water, pH regulator and reducing agent, and performing the first reduction reaction to obtain a nano-copper solution;

[0038] 2) mixing the nano-copper solution, soluble silver salt, water, pH regulator and reducing agent, and performing a second reduction reaction to obtain a nano-silver-copper composite solution;

[0039] 3) washing and concentrating the nano-silver-copper composite solution to obtain a nano-silver-copper concentrate;

[0040] 4) mixing the nano-silver-copper concentrate with an organic solvent and a surfactant to obtain a nano-silver-copper complex;

[0041] 5) Mixing the nano-silver-copper composite, resin and additives, and performing three-roll grinding to obtain the electrode paste for heterojunction solar cells.

[0042] ...

Embodiment 1

[0050] An electrode paste for heterojunction solar cells, the electrode paste comprises the following components in mass percentage: 95% of nanometer silver-copper compound, 4% of resin and 1% of auxiliary agent.

[0051] Its preparation method comprises the following steps:

[0052] 1) Mix the soluble copper salt, water, pH regulator and reducing agent, and perform the first reduction reaction to obtain the nano-copper solution. The soluble copper salt is copper nitrate; the pH regulator is ammonium bicarbonate; the reducing agent is sericin; the mass ratio of the soluble copper salt, water, pH regulator and reducing agent is 5:50: 3:4. The mixing method is stirring and mixing, and the stirring speed is 50 rpm. First mix the soluble copper salt and water at 60°C for 40 minutes, then raise the temperature to 90°C and add a pH regulator to adjust the pH value to 8, then add a reducing agent to carry out the reduction reaction until the pH value reaches 5.5 to obtain the nanom...

Embodiment 2

[0059] An electrode paste for a heterojunction solar cell, the electrode paste comprises the following components in mass percentage: 91.5% of nano-silver-copper composite, 6% of resin and 2.5% of additives. Its preparation method comprises the following steps:

[0060] 1) Mix the soluble copper salt, water, pH regulator and reducing agent, and perform the first reduction reaction to obtain the nano-copper solution. Described soluble copper salt is copper acetate; Described pH adjusting agent is sodium bicarbonate; Described reducing agent is glucose; The mass ratio of described soluble copper salt, water, pH adjusting agent and reducing agent is 6:45:2: 3. The mixing method is stirring and mixing, and the stirring speed is 60 rpm. First mix the soluble copper salt and water at 50°C for 36 minutes, then raise the temperature to 85°C and add a pH regulator to adjust the pH value to 8.5, then add a reducing agent to carry out a reduction reaction until the pH value reaches 6, ...

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Abstract

The invention provides electrode slurry for a heterojunction solar cell and a preparation method thereof, and belongs to the field of preparation of electronic materials. The electrode slurry providedby the invention comprises the following components in percentage by mass: 89%-95% of a nano silver-copper compound, 4%-8% of resin and 1%-3% of an auxiliary agent, the nano silver-copper compound isprepared from the following raw materials: soluble copper salt, soluble silver salt, water, a pH regulator, a reducing agent, an organic solvent and a surfactant. The nano silver-copper compound is used as a raw material, and the nano-copper is compounded in the nano-silver so that the cost of the electrode slurry can be remarkably reduced in comparison with the prior art in which pure nano-silver powder is used as the raw material; and partial melting can be realized under the condition of 150 DEG C so that the resistivity of the prepared electrode slurry after curing is low.

Description

technical field [0001] The invention belongs to the field of electronic material preparation, and in particular relates to an electrode paste for a heterojunction solar cell and a preparation method thereof. Background technique [0002] Heterojunction solar cells use low-temperature deposition of amorphous silicon thin film technology to prepare cell PN junctions on crystalline silicon substrates. This kind of battery has the following advantages: 1) It can obtain a higher open circuit voltage; 2) Compared with the traditional diffusion junction battery, it has a smaller temperature coefficient, so it can generate higher output power under high temperature conditions; 3) The whole The preparation process is carried out at a low temperature of about 200 ° C, and the performance of the silicon substrate will not be reduced due to thermal damage. [0003] Compatible with its low-temperature preparation process, if the grid electrode on the heterojunction solar cell is prepare...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01B1/22H01B13/00H01L31/0224H01L31/0747
CPCH01B1/22H01B13/00H01L31/022425H01L31/0747Y02E10/50
Inventor 张宇阳莫丽玢赵雷王文静
Owner INST OF ELECTRICAL ENG CHINESE ACAD OF SCI
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