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Environment-friendly conductive silver paste and preparation method thereof and crystalline silicon solar cell prepared from environment-friendly conductive silver paste

A conductive silver paste, an environmentally friendly technology, applied in the field of solar cells to achieve high conversion efficiency, surface tension improvement, and lower resistivity

Inactive Publication Date: 2018-11-13
YANGZHOU XINJING PHOTOVOLTAIC TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In order to solve the above technical problems, the present invention provides an environmentally friendly conductive silver paste and a preparation method thereof, and a crystalline silicon solar cell prepared therefrom, to solve the problem of reducing series resistance, improving photoelectric conversion efficiency, meeting environmental protection requirements, and improving silver conductor Sintering quality of slurry and problems with good thixotropy

Method used

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  • Environment-friendly conductive silver paste and preparation method thereof and crystalline silicon solar cell prepared from environment-friendly conductive silver paste

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Effect test

Embodiment 1

[0022] The preparation of embodiment 1 environmental protection conductive silver paste I

[0023] Step 1. Preparation of compound silver powder: Add ammonia water dropwise to a silver nitrate solution with a mass concentration of 0.5mol / L, the molar ratio of ammonia water to silver nitrate is 1:1, mix evenly to obtain a mixed solution A, and the mass ratio is Mix 1:1 oleic acid and ascorbic acid solution with a mass concentration of 1.5mol / L to obtain mixed solution B, then add solution A and solution B dropwise into the reactor at the same time, the mass ratio of solution A to solution B is 18: 1. The reaction temperature is 15-45°C, and the reaction time is 2-5h. After the reaction is completed, filter the reactant to obtain the filter residue, wash the filter residue with deionized water and absolute ethanol in turn, and dry the washed product under vacuum at 50°C for 4h Obtain the micron silver powder, the particle diameter of the micron silver powder is 0.8 μm, and the t...

Embodiment 2

[0028] The preparation of embodiment 2 environmental protection conductive silver paste II

[0029]Step 1. Preparation of compound silver powder: Add ammonia water dropwise to a silver nitrate solution with a mass concentration of 0.5 mol / L, the molar ratio of ammonia water to silver nitrate is 4:1, mix evenly to obtain a mixed solution A, and the mass ratio is 1: 1.2 oleic acid and ascorbic acid solution with a mass concentration of 1.5mol / L are mixed evenly to obtain a mixed solution B, and then solution A and solution B are added dropwise to the reactor at the same time, and the mass ratio of solution A to solution B is 40: 1. The reaction temperature is 15-45°C, and the reaction time is 2-5h. After the reaction is completed, filter the reactant to obtain the filter residue, wash the filter residue with deionized water and absolute ethanol in turn, and dry the washed product under vacuum at 50°C for 4h Obtain the micron silver powder, the particle diameter of the micron sil...

Embodiment 3

[0034] The preparation of embodiment 3 environmental protection conductive silver paste III

[0035] Step 1. Preparation of compound silver powder: Add ammonia water dropwise to a silver nitrate solution with a mass concentration of 0.5mol / L, the molar ratio of ammonia water to silver nitrate is 3:1, mix evenly to obtain a mixed solution A, and the mass ratio is 1: 1.1 oleic acid and ascorbic acid solution with a mass concentration of 1.5mol / L are mixed evenly to obtain mixed solution B, and then solution A and solution B are added dropwise to the reactor at the same time, the mass ratio of solution A to solution B is 25: 1. The reaction temperature is 15-45°C, and the reaction time is 2-5h. After the reaction is completed, filter the reactant to obtain the filter residue, wash the filter residue with deionized water and absolute ethanol in turn, and dry the washed product under vacuum at 50°C for 4h Obtain the micron silver powder, the particle diameter of the micron silver p...

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Abstract

The invention discloses environment-friendly conductive silver paste and a preparation method thereof and a crystalline silicon solar cell prepared from the environment-friendly conductive silver paste. The environment-friendly conductive silver paste is prepared from compound silver powder, high-performance lead-free glass powder and an organic carrier, wherein the compound silver powder is micron silver powder containing ultrafine silver oxide with the mass fraction of 4-9%. Compared with the prior art, the ultrafine silver oxide is compounded with the micron silver powder, so that formationof a dense and flat silver film is facilitated; the environment-friendly conductive silver paste has relatively high tap density and relatively high sintering activity; the lead-free target of the conductive silver paste at the front side of the crystalline silicon solar cell is achieved by adopting the high-performance lead-free glass powder; the surface tension and the rheological property of the conductive silver paste are improved through adjusting the components and the content of the organic carrier; the environment-friendly conductive silver paste disclosed by the invention has good thixotropy and low contact resistance; the photoelectric conversion efficiency of the prepared crystalline silicon solar cell reaches 17.9-18.1%; new energy can be developed; and the crystalline siliconsolar cell conforms to the environmental protection concept and has a broad application prospect.

Description

technical field [0001] The invention relates to the technical field of solar cells, in particular to an environmentally friendly conductive silver paste, a preparation method thereof, and a crystalline silicon solar cell prepared therefrom. Background technique [0002] As a kind of green energy, solar cells have attracted more and more attention due to their inexhaustible, non-polluting, and unrestricted by geographical resources. Therefore, in recent years, crystalline silicon solar cells have been used as the main solar photovoltaic power generation unit. Among them, the front side of solar cells is an important part of crystalline silicon solar cells. As the side that directly receives solar energy, it uses a multi-layer structure to achieve the widest receiving line and the least light reflection consumption. The front side of a conventional commercial crystalline silicon solar cell includes a four-layer main structure of a silver electrode grid line, an anti-reflection...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01B1/02H01B13/00H01L31/0224
CPCH01B1/02H01B13/00H01L31/022433Y02E10/50
Inventor 李超黄辉陈宝山夏平春徐芳唐军冯帅臣
Owner YANGZHOU XINJING PHOTOVOLTAIC TECH
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