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Solar cell and manufacturing method thereof

A solar cell and electrode technology, applied in the direction of final product manufacturing, sustainable manufacturing/processing, circuits, etc., can solve the problem of cost reduction

Pending Publication Date: 2021-03-09
JINKO GREEN ENERGY SHANGHAI MANAGEMENT CO LTD +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] However, the conversion efficiency of existing solar cells still needs to be improved, and the cost needs to be reduced

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

[0024] refer to figure 1 , taking the solar cell as a TOPCon cell as an example.

[0025] In existing applications, the solar cell 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 contact the second electrode.

[0026] The field passivation layer 122 is generally a doped polysilicon layer or an amorphous silicon layer. In order to achieve a saturation recombination current density as low as possible in the second electrode coverage area, that is, the first region 10a, the field passivation layer 122 needs to be heavily Doping 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 carriers, and form a good ohmic con...

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Abstract

The embodiment of the invention provides a solar cell and a manufacturing method thereof. The solar cell comprises a substrate, a first passivation film and a first electrode which are located on theupper surface of the substrate, and a field passivation layer and a second electrode which are located on the lower surface of the substrate. The field passivation layer comprises a first field passivation sub-layer located between the second electrode and the substrate and a second field passivation sub-layer located between the adjacent second electrodes; the conductivity of the material of thefirst field passivation sub-layer is greater than that of the material of the second field passivation sub-layer, and the thickness of the second field passivation sub-layer is smaller than that of the first field passivation sub-layer; the first electrode comprises a silver electrode, a conductive adhesive and an electrode film which are sequentially stacked in the direction, facing the first passivation film, of the substrate; and / or, in the direction, facing the field passivation layer, of the substrate, the second electrode comprises a silver electrode, a conductive adhesive and an electrode film which are stacked in sequence. The embodiment of the invention is beneficial to improving the conversion efficiency of the solar cell and reducing the cost 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. In addition, in order to reduce the resistivity of solar cells, silver metal is usually used as an electrode material in the prior art. [0003] However, the conversion efficiency of existing solar cells still needs to be improved, and the cost needs to be reduced. Contents of the invention [0004] Embodiments of the present invention provide a solar cell and a manufacturing...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01L31/0216H01L31/02H01L31/0352H01L31/18
CPCH01L31/02167H01L31/02008H01L31/03529H01L31/035272H01L31/1868H01L31/022425H01L31/068Y02E10/547Y02P70/50H01L31/02168H01L31/022441H01L31/02363H01L31/0682
Inventor 金井升张昕宇
Owner JINKO GREEN ENERGY SHANGHAI MANAGEMENT CO LTD
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