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Electrode design and cell interconnection method of heterojunction solar cell with double-sided power generation

A technology for designing solar cells and electrodes, applied in the field of solar cells, can solve the problems of poor adhesion and large consumption of silver paste in heterojunction solar cells, and achieve the effect of solving poor adhesion characteristics and saving consumption of silver paste

Pending Publication Date: 2021-12-21
SOUTHWEST PETROLEUM UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The purpose of the present invention is to overcome the defects of the prior art, provide the electrode design and battery interconnection method of the heterojunction solar cell that generates electricity on both sides, and specifically disclose the laminated metal backlight surface electrode applied to the heterojunction solar cell, Replace the traditional screen printing process, solve the technical problems of high silver paste consumption and poor adhesion of heterojunction solar cells in conventional technologies, and realize the interconnection structure of solar cells at the same time, thereby achieving the purpose of high efficiency and low cost

Method used

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  • Electrode design and cell interconnection method of heterojunction solar cell with double-sided power generation
  • Electrode design and cell interconnection method of heterojunction solar cell with double-sided power generation

Examples

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Embodiment 1

[0060] This embodiment describes in detail the electrode design method of a heterojunction solar cell that generates electricity on both sides. see figure 1 , wherein, 101-106 constitute the heterojunction solar cell substrate (1), and 2-4 constitute the solar cell backlight electrodes.

[0061] The process steps are:

[0062] a. Clean the N-type monocrystalline silicon chip (101) with the RCA method, and then corrode the silicon chip with an alkaline solution to make texture;

[0063] b. Depositing an intrinsic amorphous silicon layer (102) by PECVD on both sides of the silicon wafer with a thickness of 5nm;

[0064] c. Depositing an n-type amorphous silicon layer (103) with a thickness of 10 nm by PECVD;

[0065] d. Depositing a p-type amorphous silicon layer (104) with a thickness of 10 nm by PECVD method;

[0066] e. on the n-type amorphous silicon layer (103) and the p-type amorphous silicon layer (104), deposit a transparent conductive film IWO (105) with a thickness...

Embodiment 2

[0071] This example specifically describes the interconnection method of double-sided heterojunction solar cells. On the basis of the aforementioned preparation method, the working process and technical parameters are further limited to realize the interconnection technology. Please refer to figure 1 and figure 2 :

[0072] a. Prepare two double-sided heterojunction solar cells by the method of Example 1;

[0073] b. Fix the conductive grid line (5) on the electrode on the backlight surface of the heterojunction solar cell, which is directly connected to the welding layer (4) on the metal grid line on the light incident surface of another adjacent heterojunction solar cell; The conductive grid wires are copper or aluminum with a diameter of 1-50 μm, and the number of conductive grid wires on each heterojunction solar cell is ≥ 56; the fixing method is welding or hot pressing.

[0074] In this embodiment, combined with the electrode design method in Embodiment 1, conductive ...

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Abstract

The invention discloses electrode design and a cell interconnection method of a heterojunction solar cell with double-sided power generation, and belongs to the technical field of solar cells. The electrode design comprises heterojunction solar cell substrates, solar cell light incident surface screen-printed silver electrodes, solar cell backlight surface electrodes; and interconnection between solar cells. The electrode design is characterized in that each heterojunction solar cell backlight surface electrode comprises a metal seed layer located on a transparent conductive film, and a conducting layer and a welding layer which are sequentially located on the metal seed layer; The backlight surface electrodes are connected with incident surface electrode grid lines of another adjacent heterojunction solar cell, so that interconnection and conduction of the heterojunction solar cells are realized. According to the electrode design and the cell interconnection method of the heterojunction solar cell with double-sided power generation, an original screen-printed Ag back electrode is replaced by depositing the metal lamination, and the advantages of preparing the back electrodes at low cost and realizing cell interconnection are achieved.

Description

technical field [0001] The invention relates to the technical field of solar cells, in particular to an electrode design and a battery interconnection method of a heterojunction solar cell generating electricity on both sides. Background technique [0002] A solar cell is a new energy device that directly converts light energy into electrical energy by using the photovoltaic effect. After the solar cells are connected in series, they can be packaged to form a large-area solar cell module. Effectively improving the photoelectric conversion efficiency of solar cells and reducing production costs are key issues that must be solved for high-efficiency solar cells, and are also the key to developing practical applications of solar energy. Amorphous silicon / crystalline silicon heterojunction solar cells have many advantages such as good passivation effect, no PID attenuation, low process temperature, high conversion efficiency, simple and symmetrical structure, and double-sided po...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01L31/0224H01L31/0747H01L31/05H01L31/20
CPCH01L31/022425H01L31/022433H01L31/0747H01L31/0504H01L31/202Y02E10/50Y02P70/50
Inventor 白宇俞健邱卿清李君君
Owner SOUTHWEST PETROLEUM UNIV
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