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A kind of manufacturing method of passivated contact solar cell

A technology of a solar cell and a manufacturing method, applied in the field of solar cells, can solve the problems of reduction, high process control and environmental requirements, difficult manufacturing cost of a transparent conductive film, etc., achieves simple process, advantages of light transmittance and electrical conductivity, and reduces light The effect of occlusion area

Active Publication Date: 2019-10-18
LONGI SOLAR TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the current production method of ITO transparent conductive film needs the help of expensive equipment, and the process control and environmental requirements are high, which makes it difficult to reduce the manufacturing cost of transparent conductive film in a short time

Method used

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  • A kind of manufacturing method of passivated contact solar cell
  • A kind of manufacturing method of passivated contact solar cell

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] A method for making a passivated contact solar cell, comprising the following steps:

[0039] Step 1: Texture the P-type monocrystalline silicon wafer in NaOH hot solution, and wash to remove the dirt and damaged layer on the surface of the silicon wafer, and form a pyramidal light-trapping structure on the surface.

[0040] Step 2: Place the textured silicon wafer in ozone water with an ozone concentration of 50 ppm for 15 minutes to form a 1.2nm dense silicon oxide film on the surface of the silicon wafer.

[0041] Step 3: Prepare doped nano silicon powder slurry and nano silver wire colloid respectively.

[0042] The slurry doped with nano-silicon powder includes: ① Nano-crystalline silicon powder, with a mass fraction of 30% and a particle size of about 100nm. ②A slurry doped with nano-silicon powder is doped with boric acid, and the mass fraction of boron is 10^-7; another slurry doped with nano-silicon powder is doped with phosphoric acid, and the mass fraction o...

Embodiment 2

[0051] Step 1: forming an inverted pyramid structure on the surface of the N-type single crystal silicon wafer by catalytic chemical etching with nanometer metal particles.

[0052] Step 2: Place the textured silicon wafer in a thermal oxidation furnace in an oxygen atmosphere at 800° C. for 10 minutes to form a 2nm dense silicon oxide film on the surface.

[0053] Step 3: Prepare doped nano silicon powder slurry and nano silver wire colloid respectively.

[0054] The slurry doped with nano-silicon powder includes: ① Nano-crystalline silicon powder, with a mass fraction of 70% and a particle size of about 300nm. ② One kind of doped nano-silicon powder slurry is doped with boric acid, and the mass fraction of boron element is 10^-5; the other doped nano-silicon powder slurry is doped with phosphoric acid, and the mass fraction of phosphorus element is 10 ^-5. ③ According to the performance of the slurry, add the organic additive terpineol in proportion.

[0055] The nano sil...

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Abstract

The invention discloses a manufacturing method of a passivation contact solar battery. A tunneling oxide layer is coated with doped nanometer silicon powder paste to form a doped poly / microcrystallinesilicon layer; and the doped poly / microcrystalline silicon layer is coated with nanometer silver wire colloid to form a nanometer silver wire transparent conductive film. By virtue of the method, useof various inflammable and explosive and virulent process gases and expensive production equipment can be avoided; and in addition, the process is simple and the manufacturing cost is low.

Description

technical field [0001] The invention belongs to the technical field of solar cells, in particular to a method for making passivated contact solar cells. Background technique [0002] Since the first solar cell was born in Bell Laboratories in 1954, crystalline silicon solar cells have been widely used, the conversion efficiency has been continuously improved, and the production cost has continued to decline. At present, crystalline silicon solar cells account for more than 80% of the global market for solar cells. The conversion efficiency of crystalline silicon cell production lines has exceeded 21%. The cost of electricity continues to shrink and is expected to be flat in the next few years. As a clean energy source, crystalline silicon solar cells play an increasingly important role in changing the energy structure and alleviating environmental pressure. [0003] An important way to improve the efficiency of crystalline silicon cells is to reduce the high minority carri...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01L31/18H01L31/0224H01L31/0216
CPCH01L31/02168H01L31/022491H01L31/1804H01L31/1884Y02E10/547Y02P70/50
Inventor 赵科雄贾苗苗许庆丰
Owner LONGI SOLAR TECH CO LTD
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