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CN-122002944-A - Solar cell, preparation method thereof and photovoltaic device

CN122002944ACN 122002944 ACN122002944 ACN 122002944ACN-122002944-A

Abstract

The invention provides a solar cell, a preparation method thereof and photovoltaic equipment. The method for manufacturing the solar cell comprises the steps of forming a conductive seed layer on a light facing surface and/or a backlight surface of a cell body, forming patterned photoresist on the surface of the conductive seed layer, which is far away from the cell body, exposing part of the surface of the conductive seed layer, arranging conductive wires on the surface of the photoresist, which is far away from the cell body, forming a conductive connecting layer in a gap between the conductive seed layer exposed by the photoresist and the conductive wires through electroplating, and removing the photoresist and the area of the conductive seed layer, which is not covered by the conductive connecting layer. The conductive connecting layer is formed between the conductive wire and the patterned conductive seed layer through electroplating, so that the conductive wire and the conductive connecting layer and the patterned conductive seed layer are electrically connected through contact, and a low-temperature electroplating process is adopted to replace a high-temperature welding process, so that negative influence of high temperature in the welding process on the battery can be effectively avoided.

Inventors

  • ZHANG LI
  • HUANG GENGWEN
  • WANG SHENCUN
  • SUN GUOLIANG
  • JIANG WEIPENG

Assignees

  • 协鑫集成科技股份有限公司
  • 合肥协鑫集成新能源科技有限公司

Dates

Publication Date
20260508
Application Date
20251225

Claims (10)

  1. 1. A method of making a solar cell, comprising: forming a conductive seed layer on the light facing surface and/or the backlight surface of the battery body; forming a patterned photoresist on a surface of the conductive seed layer away from the battery body, the photoresist exposing a portion of the surface of the conductive seed layer; Arranging conductive wires on the surface of the photoresist, which is far away from the battery body; Forming a conductive connection layer in a gap between the conductive seed layer exposed by the photoresist and the conductive wire by electroplating; And removing the photoresist and the area of the conductive seed layer not covered by the conductive connection layer.
  2. 2. The method of claim 1, wherein the conductive filament acts as a cathode, and the conductive connection layer is grown from the conductive filament to the conductive seed layer until the conductive connection layer is connected to the conductive seed layer.
  3. 3. The method of claim 1, wherein the conductive seed layer acts as a cathode, and the conductive connection layer is grown from the conductive seed layer to the conductive filaments until the conductive connection layer is connected to the conductive filaments.
  4. 4. A method according to any one of claims 1 to 3, wherein the thickness of the photoresist is consistent with the thickness of the conductive connection layer.
  5. 5. A method according to any one of claims 1 to 3, wherein after the conductive filaments are provided on the surface of the photoresist remote from the battery body, the conductive filaments and the photoresist are fixed with an adhesive.
  6. 6. A method according to any one of claims 1 to 3, wherein the thickness of the conductive connection layer is 5 to 15 microns.
  7. 7. A method according to any one of claims 1 to 3, wherein the material of the conductive connection layer comprises at least one of copper and silver.
  8. 8. A method according to any one of claims 1 to 3, wherein the material of the conductive seed layer comprises at least one of copper, nickel, silver and tin; and/or the material of the conductive wire comprises at least one of copper, nickel, silver and tin.
  9. 9. A solar cell prepared by the method of any one of claims 1 to 8.
  10. 10. A photovoltaic device comprising the solar cell of claim 9.

Description

Solar cell, preparation method thereof and photovoltaic device Technical Field The invention relates to the technical field of solar cells, in particular to a solar cell, a preparation method thereof and photovoltaic equipment. Background In order to reduce the power generation loss of the solar cell, a current collection path can be designed through a stacked grid technology, the stacked grid cell creatively combines a grid line and a welding belt, specifically, a seed layer can be printed on the surface of the cell, and then a thin conductive wire and the seed layer are welded in a welding mode. The thin conductive wires of the two cells are connected to transmit current between the two cells. The current transmission path of the stacked gate solar cell is that the current is transmitted to the seed layer through the semiconductor of the solar cell, then is directly transmitted to the thin conductive wire through the seed layer, and then is transmitted along the thin conductive wire. The stacked gate technology shortens the current transmission path, reduces the current transmission loss and improves the conversion efficiency of the photovoltaic module. However, the stacked gate technology utilizes a high-temperature welding mode to weld and connect the thin conductive wires with the seed layer, and the high-temperature welding technology can bring negative effects to the solar cell, such as a large amount of residual thermal stress, and the risk of easy breakage of welding spots. Disclosure of Invention The present invention aims to solve at least one of the technical problems in the related art to some extent. Therefore, an object of the present invention is to provide a method for manufacturing a solar cell, in which connection of a conductive wire and a conductive seed layer by a low-temperature electroplating process helps to improve performance of the solar cell. In one aspect of the invention, a method of making a solar cell is provided. According to the embodiment of the invention, the method for preparing the solar cell comprises the steps of forming a conductive seed layer on a light facing surface and/or a backlight surface of a cell body, forming patterned photoresist on the surface of the conductive seed layer, which is far away from the cell body, wherein part of the surface of the conductive seed layer is exposed by the photoresist, arranging conductive wires on the surface of the photoresist, which is far away from the cell body, forming a conductive connecting layer in a gap between the conductive seed layer exposed by the photoresist and the conductive wires through electroplating, and removing the photoresist and the area of the conductive seed layer, which is not covered by the conductive connecting layer. In the method for preparing the solar cell, the conductive connecting layer is formed between the conductive wire and the patterned conductive seed layer through electroplating, so that the conductive wire and the conductive connecting layer and the patterned conductive seed layer are electrically connected through contact, and a low-temperature electroplating process is adopted to replace a high-temperature welding process, so that negative influence of high temperature in the welding process on the cell can be effectively avoided. According to an embodiment of the present invention, the conductive wire is used as a cathode, and the conductive connection layer is grown from the conductive wire to the conductive seed layer until the conductive connection layer is connected to the conductive seed layer. According to an embodiment of the present invention, the conductive seed layer serves as a cathode, and the conductive connection layer is grown from the conductive seed layer to the conductive wire until the conductive connection layer is connected to the conductive wire. According to an embodiment of the present invention, the thickness of the photoresist is consistent with the thickness of the conductive connection layer. According to the embodiment of the invention, after the conductive wire is arranged on the surface of the photoresist far away from the battery body, the conductive wire and the photoresist are fixed by adopting adhesive. According to the embodiment of the invention, the thickness of the conductive connection layer is 5-15 microns. According to an embodiment of the present invention, the material of the conductive connection layer includes at least one of copper and silver. According to an embodiment of the invention, the material of the patterned conductive seed layer comprises at least one of copper, nickel, silver and tin, and/or the material of the conductive filaments comprises at least one of copper, nickel, silver and tin. In another aspect of the invention, the invention provides a solar cell prepared by the method described above. Therefore, the solar cell has good performance and better stability. Those skilled in the art will appreciate that the solar ce