High-efficiency heterojunction solar cell and preparation method thereof

A technology for solar cells and heterojunctions, applied in the field of solar cells, can solve the problems of increased loading and unloading and handling labor, high battery manufacturing costs, cumbersome process flow, etc., to improve product consistency, improve quality levels, and reduce metal impurities. The effect of content

Active Publication Date: 2022-05-27
CHANGZHOU SHICHUANG ENERGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

With this method of absorbing impurities, the process is cumbersome, and the silicon wafer needs to be loaded and unloaded every time a process is completed, which takes a long time, and it is necessary to add a cleaning equipment and a furnace tube equipment, and each corresponding equipment needs to increase loading and unloading and handling labor. , leading to high battery manufacturing costs

Method used

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  • High-efficiency heterojunction solar cell and preparation method thereof
  • High-efficiency heterojunction solar cell and preparation method thereof
  • High-efficiency heterojunction solar cell and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0050] Preparation method of high efficiency heterojunction solar cell, comprising the following steps:

[0051] (1) Take 1200 N-type monocrystalline silicon wafers and perform full-chain plurgy absorption of silicon wafers through full-chain pluto-suction equipment, including:

[0052] (a) Pre-chain cleaning of silicon wafers: Silicon wafers are transported through the conveyor roller into the pre-chain cleaning functional area, first cleaned by NaOH solution with a mass percentage concentration of 1%, and then cleaned by HF solution with a mass percentage concentration of 5%, washed and dried after washing, which is used to remove organic matter, damage layer, metal impurities and oxide layers on the surface of the silicon wafer, and improve the cleanliness of the surface of the silicon wafer;

[0053] (b) Chain coating and suction of impurity sources on the surface of the silicon wafer: after drying, the silicon wafer is transferred through the transfer roller into the functiona...

Embodiment 2

[0063]Preparation method of high efficiency heterojunction solar cell, comprising the following steps:

[0064] (1) Take 1200 N-type monocrystalline silicon wafers and perform full-chain plurgy absorption of silicon wafers through full-chain pluto-suction equipment, including:

[0065] (a) Pre-chain cleaning of the silicon wafer: the silicon wafer is transferred through the conveyor roller into the pre-chain cleaning functional area, first cleaned by the KOH solution with a mass percentage concentration of 1%, and then cleaned by the HF solution with a mass percentage concentration of 1%, and dried after washing, which is used to remove the organic matter, damage layer, metal impurities and oxide layer on the surface of the silicon wafer to improve the cleanliness of the surface of the silicon wafer;

[0066] (b) Chain coating and suction of impurities on the surface of the silicon wafer: after drying, the silicon wafer is transferred through the conveyor roller into the functiona...

Embodiment 3

[0077] Preparation method of high efficiency heterojunction solar cell, comprising the following steps:

[0078] (1) Take 1200 N-type monocrystalline silicon wafers and perform full-chain plurgy absorption of silicon wafers through full-chain pluto-suction equipment, including:

[0079] (a) Pre-chain cleaning of silicon wafers: Silicon wafers are transported through the transfer roller into the pre-chain cleaning functional area, first cleaned by NaOH solution with a mass percentage concentration of 3%, and then cleaned by HF solution with a mass percentage concentration of 10%, washed and dried, used to remove organic matter, damage layer, metal impurities and oxide layers on the surface of the silicon wafer, and improve the cleanliness of the surface of the silicon wafer;

[0080] (b) Chain coating and suction of impurities on the surface of the silicon wafer: after drying, the silicon wafer is transferred through the transfer roller into the functional area of the chain coating...

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Abstract

The invention discloses a high-efficiency heterojunction solar cell and a preparation method thereof, and the preparation method is characterized in that a gettering process is added before a conventional heterojunction solar cell preparation process, and the gettering process is completed through a full-chain gettering process; the full-chain gettering process comprises the following steps: carrying out chain pre-cleaning on a silicon wafer; coating a gettering source on the surface of the silicon wafer in a chained manner; and carrying out chained high-temperature gettering on the silicon wafer. According to the preparation method, by reducing the metal impurity content of the N-type monocrystalline silicon wafer, the quality level of the silicon wafer is improved, the difference between the silicon wafers is reduced, and the conversion efficiency of the heterojunction solar cell is improved; the quality of the N-type monocrystalline silicon wafer tends to be consistent, the efficiency distribution of the prepared heterojunction solar cell is more concentrated, the discreteness of the efficiency distribution is reduced, and the product consistency is greatly improved.

Description

Technical field [0001] The present invention relates to the field of solar cell technology, specifically to a highly efficient heterojunction solar cell and a preparation method thereof. Background [0002] With the continuous development of the photovoltaic industry, high-efficiency N-type crystalline silicon cells are an inevitable choice for high-efficiency cell technology routes due to their natural advantages such as high sub-product life and no light-induced attenuation, and are also a new generation of battery technology that the photovoltaic industry is entering large-scale production. Among them, heterojunction solar cells due to their high conversion efficiency, the simplicity of the process has received widespread attention, in order to obtain higher conversion efficiency, heterojunction solar cells usually use N-type monocrystalline silicon wafers. [0003] Because the process temperature of the heterojunction solar cell production process needs to be controlled at lo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01L31/18H01L31/072
CPCH01L31/1804H01L31/072Y02P70/50
Inventor 任常瑞张佳舟绪欣符黎明
Owner CHANGZHOU SHICHUANG ENERGY CO LTD
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