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CN-122008687-A - Printing screen, preparation method thereof and solar cell

CN122008687ACN 122008687 ACN122008687 ACN 122008687ACN-122008687-A

Abstract

The embodiment of the application relates to the field of photovoltaics, and provides a printing screen, a preparation method thereof and a solar cell, wherein the printing screen comprises a screen main body, a plurality of hollow areas, a plurality of solar cells and a plurality of solar cells, wherein the screen main body comprises a plurality of hollow areas, the plurality of hollow areas are arranged at intervals along a first direction, the hollow areas extend along a second direction, and the second direction is intersected with the first direction; at least one protective layer is arranged on the surface of the screen main body, the protective layer comprises a plurality of extending parts, the extending parts are overlapped with the hollowed-out areas, the extending parts are arranged at intervals in the second direction, at least part of the extending parts extend along the first direction, and the width of the extending parts in the first direction is at a nano level. The printing screen provided by the embodiment of the application can at least improve the printing quality of the grid lines in the solar cell.

Inventors

  • GUO RUIJIE
  • MIAO LIYAN
  • LIU ZHI
  • ZHANG YUSEN

Assignees

  • 上饶晶科能源叁号智造有限公司
  • 晶科能源(海宁)有限公司

Dates

Publication Date
20260512
Application Date
20260401

Claims (11)

  1. 1. A printing screen, comprising: the screen printing plate comprises a screen printing plate body, wherein the screen printing plate body comprises a plurality of hollowed-out areas, the hollowed-out areas are arranged at intervals along a first direction, the hollowed-out areas extend along a second direction, and the second direction is intersected with the first direction; The protective layer is arranged on the surface of the screen printing plate main body, the protective layer comprises a plurality of extending parts, the extending parts are overlapped with the hollowed-out areas, the extending parts are arranged at intervals in the second direction, at least part of the extending parts extend along the first direction, and the width of the extending parts in the first direction is at a nano level.
  2. 2. The printing screen of claim 1, wherein the plurality of extensions comprise inorganic non-metallic fibers.
  3. 3. The printing screen of claim 2, wherein the inorganic non-metallic fibrous material comprises at least one of silica or ceramic.
  4. 4. The printing screen of claim 1, wherein the protective layer further comprises a body portion connected to the plurality of extensions, the body portion at least partially overlapping the non-hollowed-out area of the screen body.
  5. 5. The printing screen of claim 1, wherein the length of the extension in the first direction is greater than or equal to the length of the hollowed-out region in the first direction.
  6. 6. The printing screen of claim 1, wherein the extension has a width in the second direction of greater than or equal to 50nm and less than or equal to 100nm.
  7. 7. The printing screen of claim 1, wherein the spacing of adjacent ones of the extensions in the second direction is greater than or equal to 100 μm and less than or equal to 500 μm.
  8. 8. The printing screen of claim 1, wherein the screen body is a steel plate.
  9. 9. A method of producing a printing screen, for producing a printing screen according to any one of claims 1 to 8, comprising: Providing the screen printing plate main body, wherein the screen printing plate main body comprises a plurality of hollowed-out areas which are arranged at intervals along a first direction, the hollowed-out areas extend along a second direction, and the second direction is intersected with the first direction; Forming a protective material layer on the screen main body; and melting a part of the area, located on the hollow area, of the protective material layer by utilizing laser to form a protective layer with a plurality of extending parts, wherein the extending parts are arranged at intervals in the second direction, at least part of the extending parts extend along the first direction, and the width of the extending parts in the first direction is nano-scale.
  10. 10. A solar cell, characterized in that it comprises a grid line produced using the printing screen of any one of claims 1 to 8.
  11. 11. The solar cell of claim 10, wherein the width of each portion of the grid line in the first direction varies by less than 5%.

Description

Printing screen, preparation method thereof and solar cell Technical Field The application relates to the field of photovoltaics, in particular to a printing screen, a preparation method thereof and a solar cell. Background In the manufacture of a solar cell, screen printing is an important link of metallization of a cell, and the screen printing process comprises the following steps of firstly aligning a printing screen onto a silicon wafer to be printed, setting paste to be printed on the surface of the printing screen, enabling the paste to flow to the surface of the silicon wafer through a hollowed-out area of the screen under the pushing of a scraper to form a grid line pattern, and sintering the silicon wafer printed with the grid line pattern to form the grid line. The quality and yield of the metal grid line of the battery piece are directly affected by the printing screen plate used in the screen printing process, and the screen plate is extremely easy to generate problems of local plastic deformation, edge abrasion, opening flaring or microcrack expansion and the like. These physical degradations distort the printed pattern, which is manifested as uneven gate line width, edge burrs, broken lines, or slurry overflow, forming typical defects such as "coarse gate", "jagged line", "false mark", and the like, significantly reducing the battery yield. The above information disclosed in the background section is only for enhancement of understanding of the background art from the technology described herein and, therefore, may contain some information that does not form the prior art that is already known in the country to a person of ordinary skill in the art. Disclosure of Invention The embodiment of the application provides a printing screen, a preparation method thereof and a solar cell, which are at least beneficial to improving the grid line printing quality of the solar cell. According to some embodiments of the present application, an aspect of the present application provides a printing screen, including a screen main body, the screen main body including a plurality of hollowed-out areas, the plurality of hollowed-out areas being arranged at intervals along a first direction, the hollowed-out areas extending along a second direction, the second direction intersecting the first direction, at least one protection layer disposed on a surface of the screen main body, the protection layer including a plurality of extension portions overlapping the hollowed-out areas, the plurality of extension portions being arranged at intervals along the second direction, at least a portion of the extension portions extending along the first direction, the extension portions having a width in the first direction of nanometer scale. In some embodiments of the application, the plurality of extensions comprise inorganic nonmetallic fibers. In some embodiments of the application, the inorganic nonmetallic fiber material includes at least one of silicon dioxide or ceramic. In some embodiments of the application, the protective layer further comprises a body portion connected to the plurality of extension portions, the body portion at least partially overlapping the non-hollowed-out region of the screen body. In some embodiments of the present application, a length of the extension portion in the first direction is greater than or equal to a length of the hollowed-out area in the first direction. In some embodiments of the application, the width of the extension in the second direction is greater than or equal to 50nm and less than or equal to 100nm. In some embodiments of the application, a pitch of adjacent ones of the extensions in the second direction is greater than or equal to 100 μm and less than or equal to 500 μm. In some embodiments of the application, the screen body is a steel plate. According to some embodiments of the present application, another aspect of the present application provides a method for preparing a printing screen, where the method is used for preparing the printing screen, and the method includes providing a screen main body, where the screen main body includes a plurality of hollow areas, the plurality of hollow areas are arranged at intervals along a first direction, the hollow areas extend along a second direction, the second direction intersects the first direction, forming a protective material layer on the screen main body, and melting a partial area of the protective material layer on the hollow areas by using a laser to form a protective layer having a plurality of extension portions, where at least a portion of the extension portions extend along the first direction, and a width of the extension portions in the first direction is on a nanometer scale. According to some embodiments of the present application, a further aspect of the present application provides a solar cell, where the solar cell includes a grid line, and the grid line is manufactured by using the printing screen. In