Preparation method of nanometer low-silver-content back silver conductor paste for crystalline silicon solar application

A technology of conductive paste and solar energy, which is applied in the manufacture of cables/conductors, conductive materials dispersed in non-conductive inorganic materials, electrical components, etc., and can solve problems such as poor printing performance, affecting electrical conductivity, and large paste fineness, etc. Problems, to achieve the effect of improving application performance and conductivity, improving connection strength, and improving wettability

Active Publication Date: 2015-01-14
陕西彩虹新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the silver powder used in the back silver has two disadvantages. One is that silver micropowder is mostly used, that is, the silver powder is mostly micron-sized silver powder, and the paste made is finer and rough, resulting in a thicker film during the printing process. , the compactness is not good, holes are produced, the printing performance is not good, and then the c

Method used

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Examples

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preparation example Construction

[0029] A kind of preparation method of back silver conductor paste for nanometer low silver containing crystalline silicon solar energy, comprises the following steps:

[0030] Step 1, the preparation of nano-silver powder

[0031] Slowly add 0.1-1.0mmol / L silver nitrate solution and 1.0-5.0mmol / L polyvinyl alcohol PVA solution into the 10-30mmol / L sodium borohydride solution in sequence, while stirring in a water bath, the temperature is controlled at 20 -70°C, until the solution is cloudy, centrifuge, wash with ethanol, and dry under low temperature and negative pressure at 40-50°C to obtain nano-silver powder with a particle size of 10nm-100nm; silver nitrate solution, polyvinyl alcohol PVA solution The volume ratio with sodium borohydride solution is: 2:7:1. Polyvinyl alcohol PVA solution can effectively prevent the rapid combination and agglomeration of silver particles in the reaction, and can be used as a stabilizer and dispersant; sodium borohydride is very effective ...

Embodiment 1

[0047] A kind of preparation method of back silver conductor paste for nanometer low silver containing crystalline silicon solar energy, comprises the following steps:

[0048] Step 1, the preparation of nano-silver powder

[0049]Slowly add 0.75mmol / L silver nitrate solution and 3.0mmol / L polyvinyl alcohol PVA solution dropwise into 15mmol / L sodium borohydride solution in turn, and stir in a water bath at 45°C until the solution is cloudy, then centrifuge Separation, washing with ethanol, and drying at 40°C under negative pressure to obtain silver powder with a particle size of 15nm-25nm; the volume ratio of silver nitrate solution, polyvinyl alcohol PVA solution and sodium borohydride solution is 2:7 :1.

[0050] Step 2, preparation of organic carrier

[0051] Add 45g of polyester resin to 25g of n-butanol and 30g of n-hexanol, heat at a constant temperature at 70°C until completely dissolved, and filter to obtain Organic Vehicle-1; add 30g of polyurethane resin to 40g of ...

Embodiment 2

[0055] A kind of preparation method of back silver conductor paste for nanometer low silver containing crystalline silicon solar energy, comprises the following steps:

[0056] Step 1, the preparation of nano-silver powder

[0057] Slowly add 0.85mmol / L silver nitrate solution and 3.5mmol / L polyvinyl alcohol PVA solution dropwise to 15mmol / L sodium borohydride solution in turn, while stirring in a water bath at 55°C, until the solution is cloudy, perform centrifugation , wash with ethanol, and dry at 40°C under low temperature and negative pressure to obtain silver powder with a particle size of 35nm-45nm; the volume ratio of silver nitrate solution, polyvinyl alcohol PVA solution and sodium borohydride solution is 2:7:1.

[0058] Step 2, preparation of organic carrier

[0059] Add 35g of polyester resin to 35g of n-butanol and 30g of isoamyl alcohol, heat at a constant temperature at 75°C until completely dissolved, and filter to obtain Organic Vehicle-1; add 35g of acrylic ...

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Abstract

The invention discloses a preparation method of nanometer low-silver-content back silver conductor paste for crystalline silicon solar application. The method comprises the following steps of silver powder preparation, organic carrier preparation and nanometer silver conductor paste preparation. In silver powder preparation, a saturated silver nitrate and PVA mixed solution is added dropwise into a sodium borohydride solution, then water bath stirring is conducted, centrifugation, alcohol washing and low-temperature negative-pressure drying are conducted, and then silver powder with the grain size being 1 nm-100 nm can be obtained. According to the preparation method, the self-made nanometer silver powder is used for replacing micro-sized silver powder in existing back silver conductor paste, so that the conductive performance, the printing performance and the crystalline silicon substrate adhesion performance of the paste are changed, and application of the back silver conductor paste in crystalline silicon solar energy is greatly expanded; in addition, according to the method, the adding amount of the silver powder is greatly reduced, existing paste production equipment is used in the preparation process, extra new investment is not needed, environment protection is facilitated, and use of the precious metal silver is reduced.

Description

technical field [0001] The invention relates to a preparation method of a nanometer low-silver conductor paste, in particular to a preparation method of a nanometer low-silver silver-containing back-silver conductor paste for solar energy. Background technique [0002] At present, with the acceleration of the world's energy consumption, non-renewable energy has gradually decreased. Human beings are already developing wind energy, water energy, nuclear energy and solar energy. Among them, the development and utilization of solar energy is the most environmentally friendly, effective and resource-rich. Major crystalline silicon solar PV projects are currently progressing most rapidly. Among them, the main components of the back silver paste used include functional phase silver powder, inorganic binder (such as glass powder, oxide powder, etc.), organic binder, other solvents and additives. At present, the silver powder used in the back silver has two disadvantages. One is tha...

Claims

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Application Information

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IPC IPC(8): H01B1/22H01B13/00
Inventor 樊钊锋
Owner 陕西彩虹新材料有限公司
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