A low-temperature sintered back silver paste for all-aluminum back field crystalline silicon solar cells

A technology for solar cells and low-temperature sintering, which is applied in circuits, photovoltaic power generation, electrical components, etc., and can solve the problems of reducing the opening voltage of PERC solar cells, reducing the photoelectric conversion efficiency of PERC solar cells, and the adhesion of low-temperature curing backside silver paste printing backside electrodes To achieve the effect of improving field passivation characteristics, improving photoelectric conversion efficiency, and reducing leakage current

Active Publication Date: 2020-12-18
NANTONG T SUN NEW ENERGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The present invention adopts the low-temperature curing type back silver paste to print the back electrode, which has poor adhesion and reduces the opening voltage of the PERC solar cell, thereby reducing the photoelectric conversion efficiency of the PERC solar cell.

Method used

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  • A low-temperature sintered back silver paste for all-aluminum back field crystalline silicon solar cells
  • A low-temperature sintered back silver paste for all-aluminum back field crystalline silicon solar cells
  • A low-temperature sintered back silver paste for all-aluminum back field crystalline silicon solar cells

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Effect test

Embodiment 1

[0033] 1. Preparation of low temperature sintered back silver paste

[0034]The invention provides a low-temperature sintered back silver paste for an all-aluminum back field crystalline silicon solar cell that reduces the recombination of carriers and the formation of silver-aluminum alloys. The process of using the silver paste is simple and suitable for existing The technological process, the technical point is: the low-temperature sintering type back silver paste is prepared by including the following components in parts by mass:

[0035]

[0036] Wherein, the tap density of the nano-silver powder is 3.25g / cm 3 , the specific surface area of ​​the nano-silver powder is 5cm 2 / g, the median diameter D of the nano-silver powder 50 is 0.275 μm, the particle size span of the nano-silver powder is 0.85, and the burning loss rate of the nano-silver powder is 0.15%. Mix the above-mentioned nano-silver powder, ethyl cellulose, butyl carbitol, DMA, BYK-110 and hydrogenated ca...

Embodiment 2

[0046] 1. Preparation of Glass Powder

[0047] Prepare 65 parts of Pb 2 o 3 , 10 copies of B 2 o 3 , 5 parts of ZnO, 1 part of SiO 2 , 1 part of Al 2 o 3 , 1 part of NiO and 2 parts of V 2 o 5 , and then use a known mixer such as a disperser or a three-roller to mix the materials evenly, and then perform a drying treatment for 3.5 hours, then transfer the dried raw materials to the crucible, and then place the crucible containing the raw materials into the heating chamber In the chamber, first raise the temperature to 950°C, then keep it warm for 1.5 hours, then pass the smelted material liquid through cooling rollers to obtain glass frit, then crush and sieve the glass frit to obtain the median particle size D 50 Glass frit with a thickness of 0.3 μm and a softening point of 350°C.

[0048] 2. Preparation of low temperature sintered back silver paste

[0049] The invention provides a low-temperature sintered back silver paste for an all-aluminum back field crystalli...

Embodiment 3

[0061] 1. Preparation of Glass Powder

[0062] Prepare 60 servings of Bi 2 o 3 , 20 copies of B 2 o 3 , 10 parts of Zn 3 (PO 4 ) 2 , 10 parts of SiO 2 , 3 parts of Al 2 o 3 , 3 parts of NiO and 5 parts of V 2 o 5 , and then use a known mixer such as a disperser or a three-roller to mix the materials evenly, and then perform a drying treatment for 3.5 hours, then transfer the dried raw materials to the crucible, and then place the crucible containing the raw materials into the heating chamber In the chamber, first raise the temperature to 1050°C, then keep it warm for 1 hour, then pass the smelted material liquid through cooling rollers to obtain glass frit, then crush and sieve the glass frit to obtain the median particle size D 50 Glass frit with a thickness of 0.4 μm and a softening point of 250°C.

[0063] 2. Preparation of low temperature sintered back silver paste

[0064] The invention provides a low-temperature sintered back silver paste for an all-aluminum...

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Abstract

The invention discloses a low-temperature sintered back silver paste for all-aluminum back field crystalline silicon solar cells. The silver paste mainly includes the following parts by mass: 50-70 parts of nano-silver powder, 20-50 parts of organic With 0.3 parts of dispersant and 0.1 to 0.3 parts of thixotropic agent, the nano-silver powder used in the present invention has good sintering activity and is easy to sinter under low temperature conditions, and part of the silver paste will infiltrate into the back aluminum paste during the sintering process to form relatively Nice silver aluminum contacts. The low-temperature sintered silver paste prepared by the present invention can form a complete BSF layer when preparing the back electrode, which improves the field passivation characteristics of the electrode area, reduces carrier recombination, and does not enter the silicon matrix with silver, so it will not leak electricity and reduce battery life. Leakage current improves photoelectric conversion efficiency. Compared with conventional methods, overprinting is not considered, which can reduce electrode width and cost.

Description

technical field [0001] The invention relates to the field of polymer-based conductive materials, in particular to a low-temperature sintered back silver paste for an all-aluminum back field crystal silicon solar cell. Background technique [0002] With the rapid development of modern industry, natural energy such as oil, coal, and natural gas on the earth are gradually exhausted, and the ensuing energy crisis, greenhouse effect and environmental pollution are becoming more and more serious, which forces human beings to seek alternative natural energy new clean energy. At present, the sun has gradually become an effective provider of new energy sources. Solar energy converts solar energy into electrical energy, which is the most direct way to convert solar energy with the fewest conversion links among all clean energy sources. [0003] At present, the solar cells on the market are mainly crystalline silicon solar cells, and considering the maturity of technology, photoelect...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01B1/22H01L31/0224
CPCH01B1/22H01L31/022441Y02E10/50H01L31/022425B22F1/107B22F1/054B22F1/05B22F2301/255B22F2304/10H01L31/1868
Inventor 朱鹏杨贵忠陈艳美王叶青
Owner NANTONG T SUN NEW ENERGY CO LTD
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