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Solar cell and preparation method thereof

A solar cell and back electric field technology, applied in the field of solar cells, can solve the problems of low stability of the average conversion rate of PERC cells, large investment in upgrading PERC cell technology, and the efficiency of cells cannot meet market demand, etc., and achieve structural stability. , The effect of low production cost, good wear resistance and oxidation resistance

Active Publication Date: 2019-09-27
江苏辉伦太阳能科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] At present, the efficiency of traditional cells can no longer meet the market demand, and almost all major manufacturers have switched to PERC cell technology, but the upgrade of PERC cell technology requires the addition of alumina passivation equipment, silicon nitride coating equipment on the back, laser slotting equipment, etc. , so that the investment in upgrading PERC battery technology is large, and the changes to the existing product line are huge
And the average conversion rate stability of the existing PERC battery is not high

Method used

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  • Solar cell and preparation method thereof
  • Solar cell and preparation method thereof
  • Solar cell and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Embodiment 1. A method for preparing a solar cell, specifically comprising the following steps:

[0023] 1. Carry out texturing on the front surface and the back surface of the silicon wafer.

[0024] 2. Use phosphorus oxychloride liquid source to carry out tubular phosphorus diffusion on the suede surface.

[0025] 3. Using HF, HNO 3 and other chemical solutions to etch the PN junction around the silicon wafer and on the back.

[0026] 4. Silicon nitride coating is performed on the front surface of the silicon wafer.

[0027] 5. Al on the back surface of the silicon body 2 o 3 Passivation, Al 2 o 3 Passivation film thickness is 10nm.

[0028] 6. After passivation, use silver paste to print the back electrode and dry it.

[0029] 7. Preparation of ceramic slurry: Ceramic slurry includes ceramic powder, dispersant, binder and solvent. The ceramic powder is 90 parts by weight, the dispersant is 2 parts by weight, the binder is 8 parts by weight, and the solvent i...

Embodiment 2

[0036] Embodiment 2. A method for preparing a solar cell, specifically comprising the following steps:

[0037] 1. Carry out texturing on the front surface and the back surface of the silicon wafer.

[0038] 2. Use phosphorus oxychloride liquid source to carry out tubular phosphorus diffusion on the suede surface.

[0039] 3. Use chemical solutions such as HF and HNO3 to etch the PN junction around the silicon wafer and on the back.

[0040] 4. Silicon nitride coating is performed on the front surface of the silicon wafer.

[0041] 5. Al on the back surface of the silicon body 2 o 3 Passivation, Al 2 o 3 Passivation film thickness is 10nm.

[0042] 6. After passivation, use silver paste to print the back electrode and dry it.

[0043] 7. Preparation of ceramic slurry: Ceramic slurry includes ceramic powder, dispersant, binder and solvent. The ceramic powder is 100 parts by weight, the dispersant is 3 parts by weight, the binder is 20 parts by weight, and the solvent is 4...

Embodiment 3

[0050] Embodiment 3. A method for preparing a solar cell, specifically comprising the following steps:

[0051] 1. Texturing the front and back surfaces of the silicon wafer.

[0052] 2. Use phosphorus oxychloride liquid source to carry out tubular phosphorus diffusion on the suede surface.

[0053] 3. Using HF, HNO 3 and other chemical solutions to etch the PN junction around the silicon wafer and on the back.

[0054] 4. Silicon nitride coating is performed on the front surface of the silicon wafer.

[0055] 5. Al on the back surface of the silicon body 2 o 3 Passivation, Al 2 o 3 Passivation film thickness is 10nm.

[0056] 6. After passivation, use silver paste to print the back electrode and dry it.

[0057] 7. Preparation of ceramic slurry: Ceramic slurry includes ceramic powder, dispersant, binder and solvent. The ceramic powder is 70 parts by weight, the dispersant is 0.5 parts by weight, the binder is 2 parts by weight, and the solvent is 30 parts by weight. ...

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Abstract

The invention discloses a solar cell and a preparation method thereof, belongs to the technical field of solar cells. The preparation method of the solar cell comprises the following steps: carrying out double-sided texturing; performing tubular phosphorus diffusion on the suede; performing etching; coating the front surface of the silicon wafer with a film; performing Al2O3 passivation on the back surface of the silicon wafer; after passivation is finished, printing a back electrode with silver paste and performing drying; printing and drying the back electric field by adopting ceramic slurry, and reserving an aluminum slurry printing position; performing aluminum paste printing and drying on the back electric field at the reserved position; performing silver paste printing and drying on the positive electrode; and feeding a battery piece into a sintering furnace for sintering. Compared with a PERC battery piece manufacturing process, the method has the advantages that the processes of back silicon nitride coating and laser grooving are omitted, and the equipment transformation and investment cost can be greatly reduced. The invention also provides the solar cell which contains the ceramic slurry, so that the stability of the average conversion rate of the cell is improved.

Description

technical field [0001] The invention relates to a solar cell and a preparation method thereof, belonging to the technical field of solar cells. Background technique [0002] At present, the efficiency of traditional cells can no longer meet the market demand, and almost all major manufacturers have switched to PERC cell technology, but the upgrade of PERC cell technology requires the addition of alumina passivation equipment, silicon nitride coating equipment on the back, laser slotting equipment, etc. , making PERC battery technology upgrades requires a lot of investment and huge changes to existing product lines. Moreover, the average conversion rate stability of existing PERC batteries is not high. Contents of the invention [0003] The invention provides a solar cell, comprising a Si substrate, a front coating layer and a positive electrode, the front coating layer is located on the front surface of the Si substrate, the front coating layer is provided with a positive...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01L31/18H01L31/0224H01L31/0216H01L31/068
CPCH01L31/02167H01L31/022441H01L31/068H01L31/1804H01L31/1868Y02E10/547Y02P70/50
Inventor 吴兢杜欢孙建华
Owner 江苏辉伦太阳能科技有限公司
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