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Slurry for silk-screen printing electrochemical etching as well as preparation method and application of slurry

A technology of screen printing and screen printing device is applied in the field of slurry for screen printing electrochemical etching and its preparation, which can solve the problems of etching, inability to achieve selectivity, etc.

Pending Publication Date: 2022-05-20
CSI CELLS CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, although the screen printing technology is used in the above scheme, selective etching cannot be achieved.

Method used

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  • Slurry for silk-screen printing electrochemical etching as well as preparation method and application of slurry
  • Slurry for silk-screen printing electrochemical etching as well as preparation method and application of slurry
  • Slurry for silk-screen printing electrochemical etching as well as preparation method and application of slurry

Examples

Experimental program
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Effect test

preparation example Construction

[0077] figure 1 It is a schematic diagram of the preparation method steps of the slurry described in the present invention, and the preparation method comprises the following steps: (1) mixing and stirring the thickener and the solvent to obtain the first prefabricated slurry; (2) preparing the prepared slurry obtained in step (1) The first prefabricated slurry is ultrasonically pulverized and ground to obtain a second prefabricated slurry; (3) mixing the second prefabricated slurry, ammonium fluoride and hydrogen fluoride obtained in step (2), stirring and dispersing to obtain a third prefabricated slurry (4) standing and filtering the third prefabricated slurry obtained in step (3) to obtain the slurry for screen printing electrochemical etching.

[0078] figure 2 It is a schematic diagram of the steps of the method for etching a silicon substrate with the slurry of the present invention and the electrochemical etching technology of screen printing, such as figure 2 As s...

Embodiment 1

[0086] This embodiment provides a slurry for screen printing electrochemical etching, the preparation method of the slurry for screen printing electrochemical etching includes the following steps:

[0087] (1) After preheating 93g of deionized water to 65°C, add 1.5g of xanthan gum and 1g of polyurethane thickener, and then stir at 500rpm for 20min at 65°C to obtain the first prefabricated slurry;

[0088] (2) Ultrasonic pulverizing the first prefabricated slurry obtained in step (1) for 10 minutes at a power of 1000W, and then grinding with a three-roll mill to obtain a second prefabricated slurry with a particle size of 1-20 μm;

[0089] (3) Mix the second prefabricated slurry obtained in step (2), 3 g of ammonium fluoride and 1.5 g of hydrofluoric acid, and stir at 25° C. at a speed of 200 rpm for 30 minutes to obtain a third prefabricated slurry;

[0090] (4) The third prefabricated slurry obtained in step (3) was left to stand at 25° C. for 30 minutes, and filtered throug...

Embodiment 2

[0092] This embodiment provides a slurry for screen printing electrochemical etching, the preparation method of the slurry for screen printing electrochemical etching includes the following steps:

[0093] (1) After preheating 94g of deionized water to 65°C, add 1g of xanthan gum and 1g of polyurethane thickener, and stir at 500rpm for 20min at 65°C to obtain the first prefabricated slurry;

[0094] (2) Ultrasonic pulverizing the first prefabricated slurry obtained in step (1) for 10 minutes at a power of 1000W, and then grinding with a three-roll mill to obtain a second prefabricated slurry with a particle size of 1-20 μm;

[0095] (3) Mix the second prefabricated slurry obtained in step (2), 2 g of ammonium fluoride and 2 g of hydrofluoric acid, and stir at 25° C. at a speed of 200 rpm for 30 min to obtain a third prefabricated slurry;

[0096] (4) The third prefabricated slurry obtained in step (3) was left to stand at 25° C. for 30 minutes, and filtered through a polyester...

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Abstract

The invention provides slurry for silk-screen printing electrochemical etching as well as a preparation method and application of the slurry. The slurry for electrochemical etching of silk-screen printing comprises the following components in percentage by mass: 0.35-15% of ammonium fluoride, 0.05-5% of hydrogen fluoride, 0.1-10% of a thickening agent and the balance of a solvent. The slurry can be used for a silk-screen printing electrochemical etching technology, so that selective etching is completed in one step.

Description

technical field [0001] The invention belongs to the field of battery manufacturing, and in particular relates to a slurry for screen printing electrochemical etching and a preparation method and application thereof. Background technique [0002] Solar cells are a clean and environmentally friendly energy technology, and crystalline silicon solar cell technology has developed rapidly in recent decades. Passivated emitter junction and rear cell (PERC) technology is a low-cost and high-efficiency new battery technology. Its excellent back surface passivation effect can greatly reduce the back surface recombination of the battery, thereby improving the photoelectric conversion efficiency of the battery. Currently, p-type PERC Technology has been industrialized. [0003] Electrochemical screen printing technology is a development direction of screen printing in microelectronics and photovoltaic industries. It effectively combines screen printing machines with electrochemistry, a...

Claims

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Application Information

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IPC IPC(8): C09K13/08H01L31/0352H01L31/18C25F3/12
CPCC09K13/08H01L31/1804H01L31/035281C25F3/12Y02E10/547Y02P70/50
Inventor 崔巍
Owner CSI CELLS CO LTD
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