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Production method for crystal-based solar cell

A technology for solar cells and manufacturing methods, applied in electrical components, final product manufacturing, sustainable manufacturing/processing, etc., can solve problems such as difficulty in forming back electrodes, and achieve the effects of improving power generation characteristics and expanding light-receiving area

Pending Publication Date: 2021-02-26
TOYO ALUMINIUM KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, conventionally, it has been difficult to form thin lines by screen printing using an aluminum-containing paste composition (paste composition) for forming rear electrodes. Usually, the width of thin lines that can be formed by screen printing reaches about 200 μm, which is regarded as limit
That is, conventionally, it has been difficult to form a linear back electrode composed of thin wires with a width of less than 200 μm.

Method used

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  • Production method for crystal-based solar cell
  • Production method for crystal-based solar cell
  • Production method for crystal-based solar cell

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0073] 3 parts by mass of bismuth-based glass powder and 29 parts by mass of an organic vehicle were added to 100 parts by mass of aluminum powder, and mixed using a known mixer to prepare a paste composition.

[0074]On the back side of the solar cell unit having a linear film opening with a width of 45 μm on the back passivation film (passivation film A) of a PERC solar cell with a wafer size of 156 mm square, a screen mask with an opening width of 60 μm was used. film, apply the paste composition to the area covering the opening width of the rear passivation film by screen printing, dry at 100°C for 10 minutes, and fire at 700°C or higher for 4 seconds or less. After the firing, the solar cell was acid-etched to remove the fired product of the paste composition that did not fill the opening, thereby obtaining a solar cell sample.

[0075] figure 1 (b) shows a plane observation image by a laser microscope of the back aluminum electrode of the solar cell sample produced in E...

Embodiment 2

[0077] Except using a screen mask with an opening width of 100 μm wide, the paste composition is applied to the area covering the opening width of the rear passivation film by screen printing, and a solar cell sample is obtained in the same manner as in Example 1. .

Embodiment 3

[0079] Except using a screen mask with an opening width of 150 μm wide, the paste composition is applied to the area covering the opening width of the rear passivation film by screen printing, and a solar cell sample is obtained in the same manner as in Example 1. .

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Abstract

In order to form at least one type of electrode in a size closer to the width of an opening, on a passivation film of a crystal-based solar cell having said passivation film on one surface or both surfaces of a silicon substrate, this method for producing a crystal-based solar cell having a passivation film on one surface or both surfaces of a silicon substrate comprises: step 1 for forming a coating film composed of an electrode-forming paste composition in a region covering an opening of the passivation film, the passivation film being, when provided on one surface of the silicon substrate,a passivation film A having at least one opening or being, when provided on both surfaces of the silicon substrate, passivation films A each having at least one opening; step 2 for baking the siliconsubstrate and the coating film; and step 3 for, while leaving behind baking products (8, 9) formed in such a manner as to fill recessed portions of the opening, removing a part or the whole of a baking product (7) formed in other manners.

Description

technical field [0001] The invention relates to a method for manufacturing a crystalline solar battery unit with a passivation film on one or both sides of a silicon substrate. Background technique [0002] In recent years, as a crystalline solar cell with high conversion efficiency, a silicon solar cell having an insulating film (passivation film) on both surfaces has been actively developed. Specifically, a cell with a PERC (Passivated emitter and rear cell) structure using a p-type silicon substrate and forming passivation films and electrodes on both sides, and a cell using an n-type silicon substrate are known. And a PERT (Passivated emitter and rear totally diffused cell) structure unit with a passivation film and electrodes formed on both sides. [0003] In addition, in the PERC type, PERT type unit, passivation contact type unit which improves the passivation effect by forming an oxide film and a silicon thin film between the passivation film and the silicon substra...

Claims

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Application Information

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IPC IPC(8): H01L31/0224H01L31/068H01L31/18
CPCH01L31/068H01L31/18H01L31/0224Y02E10/547Y02P70/50
Inventor 马尔万·达姆林铃木绍太
Owner TOYO ALUMINIUM KK