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Solar cell and manufacturing method thereof

A technology for solar cells and manufacturing methods, which is applied in the directions of final product manufacturing, sustainable manufacturing/processing, circuits, etc., can solve the problem that the conversion efficiency of passivation contact cells needs to be improved, and achieve the effect of improving the conversion efficiency.

Pending Publication Date: 2021-02-09
ZHEJIANG JINKO SOLAR CO LTD +1
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  • Application Information

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Problems solved by technology

[0003] However, the conversion efficiency of existing passivated contact cells needs to be improved

Method used

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  • Solar cell and manufacturing method thereof
  • Solar cell and manufacturing method thereof
  • Solar cell and manufacturing method thereof

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Embodiment Construction

[0026] refer to figure 1 , taking the solar cell as a TOPCon cell as an example.

[0027] In existing applications, the substrate 10 can be divided into a first region 10a and a second region 10b, the field passivation layer 122 is uniformly covered on the surface of the tunneling layer 121 as a film layer with the same material properties and uniform thickness, and the first region 10a A field passivation layer is used to make contact with the metal electrodes.

[0028] The field passivation layer 122 is generally a doped polysilicon layer or an amorphous silicon layer. In order to achieve the lowest possible saturation recombination current density in the metal electrode coverage area, that is, the first region 10a, the field passivation layer 122 needs to be heavily doped. complex, in order to form a relatively obvious energy band bending on the surface of the substrate 10, realize field passivation for minority carriers, realize selective transmission for majority carrier...

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Abstract

The embodiment of the invention provides a solar cell and a manufacturing method thereof, and the solar cell comprises a substrate which comprises a first region and a second region; an emitter whichis positioned on the upper surface of the substrate; a tunneling layer, a field passivation layer, a second passivation film and a second electrode which are sequentially stacked on the lower surfaceof the substrate, wherein the field passivation layer in the first area is used for making contact with the second electrode, and the conductivity of the field passivation layer in the first area is greater than that of the field passivation layer in the second area, and the light absorption capability of the field passivation layer of the second region is weaker than that of the field passivationlayer of the first region. The embodiment of the invention is beneficial to improving the conversion efficiency of the solar cell.

Description

technical field [0001] Embodiments of the present invention relate to the field of photovoltaics, and in particular to a solar cell and a manufacturing method thereof. Background technique [0002] With the continuous development of solar cell technology, the recombination loss in the metal contact area has become one of the important factors restricting the further improvement of solar cell conversion efficiency. In order to improve the conversion rate of solar cells, the solar cells are often passivated by passivating contacts to reduce the recombination in the body and surface of the solar cells. Commonly used passivated contact cells include heterojunction (Heterojunction with Intrinsic Thin-layer, HIT) cells and tunnel oxide passivated contact (Tunnel Oxide Passivated Contact, TOPCon) cells. [0003] However, the conversion efficiency of existing passivated contact cells needs to be improved. Contents of the invention [0004] Embodiments of the present invention pr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01L31/042H01L31/0224H01L31/0216H01L31/18
CPCH01L31/042H01L31/022425H01L31/02167H01L31/1868Y02E10/50Y02P70/50
Inventor 金井升王东张昕宇
Owner ZHEJIANG JINKO SOLAR CO LTD
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