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A kind of low temperature sintering silver paste and preparation method thereof

A low-temperature sintering and silver paste technology, which is applied in the field of solar cells, can solve the problems of expensive nano-silver powder, complicated preparation methods, and unsuitability for large-scale production, and achieve the effects of filling sintering voids, improving yield, and reducing damage

Active Publication Date: 2022-07-26
NANTONG T SUN NEW ENERGY CO LTD +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the nano-silver powder in this method is expensive, the preparation method is complicated, and it is not suitable for industrialized large-scale production.

Method used

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  • A kind of low temperature sintering silver paste and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0062] Select the mass fraction of 83.6wt% silver powder, 10wt% organic carrier, 6wt% low softening point glass powder, and 0.4wt% aluminum-silicon alloy powder to form the low-temperature sintered silver paste of this embodiment, and its comprehensive properties are as follows As shown in Table 1, it can be seen that the sintering temperature of the low-temperature sintered silver paste obtained in this example is 700 ° C, the surface of the silver paste after sintering is smooth, and the generated voids are less, and the contact resistivity is 0.5 mΩ·cm. -2 , the adhesion is 4.3N, and the photoelectric conversion efficiency range is 21.35%.

Embodiment 2

[0064] Select the mass fraction of 90wt% silver powder, 7.1wt% organic carrier, 2wt% low softening point glass powder, and 0.9wt% aluminum boron alloy powder additive to form the low temperature sintered silver paste of this embodiment, and its comprehensive performance As shown in Table 1, it can be seen that the sintering temperature of the low-temperature sintered silver paste obtained in this example is 720 °C, the surface of the silver paste after sintering is smooth, and the resulting cavities are less, and the contact resistivity is 0.5 mΩ·cm. -2 , the adhesion is 4.1N, and the photoelectric conversion efficiency range is 21.25%.

Embodiment 3

[0066] Select the mass fraction of 80wt% silver powder, 9.99wt% organic carrier, 10wt% low softening point glass powder, and 0.01wt% aluminum-silicon-boron alloy powder to form the low-temperature sintered silver paste of this embodiment, and its comprehensive performance As shown in Table 1, it can be seen that the sintering temperature of the low-temperature sintered silver paste obtained in this example is 715 °C, the surface of the silver paste after sintering is smooth, and the generated voids are less, and the contact resistivity is 0.5 mΩ·cm. -2 , the adhesion is 4.2N, and the photoelectric conversion efficiency range is 21.45%.

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Abstract

The invention provides a low-temperature sintered silver paste and a preparation method thereof, belonging to the technical field of solar cells. Wherein, the low-temperature sintered silver paste of the present invention comprises: 80wt%-90wt% silver powder, 5wt%-15wt% organic carrier, 2wt%-10wt% low softening point glass powder, and 0.01wt%-0.9wt% The aluminum alloy powder additive includes at least one of aluminum-silicon alloy powder additive, aluminum-boron alloy powder additive, and aluminum-silicon-boron alloy powder additive. The invention effectively increases the sintering activity of the silver paste by adding an aluminum alloy powder additive to the low-temperature sintered silver paste as a sintering accelerator, so that a better ohmic contact is formed between the silver paste and the solar cell silicon wafer, and the sintering temperature is effectively reduced , the sintering temperature range is 700℃-720℃, which solves the problem that the current sintering temperature is too high, thereby reducing the damage to the solar cells caused by high-temperature sintering, and further improving the photoelectric conversion efficiency.

Description

technical field [0001] The invention belongs to the technical field of solar cells, and in particular relates to a low-temperature sintered silver paste and a preparation method of the low-temperature sintered silver paste. Background technique [0002] Solar cell technology has attracted great attention because of its cleanliness, environmental protection and inexhaustible availability. However, the further promotion of solar cells is constrained by the price of monocrystalline and polycrystalline silicon wafers that dominate the solar cell industry, and the complex process of cell production. Improving the photoelectric conversion efficiency of solar cells can effectively reduce costs. Theoretical research shows that for every percentage increase in the photoelectric conversion efficiency of solar cells, the corresponding power generation cost will be reduced by 7%. [0003] The efficiency of solar cells is affected by many factors. In addition to the difference in photoe...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01B1/22H01B1/16H01B13/00H01L31/0224
Inventor 毛平
Owner NANTONG T SUN NEW ENERGY CO LTD
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