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Efficient heterojunction solar cell and preparation method thereof

A solar cell and heterojunction technology, which is applied in the field of solar cells, can solve the problems of increased loading and unloading and handling labor, high cell manufacturing costs, cumbersome process flow, etc., and achieves improved cell yield, concentrated efficiency distribution, and low energy consumption. Effect

Inactive Publication Date: 2021-01-29
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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  • Efficient heterojunction solar cell and preparation method thereof

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Effect test

Embodiment 1

[0043] A method for preparing a high-efficiency heterojunction solar cell, specifically comprising the following steps:

[0044] (1) Full-chain gettering for N-type silicon wafers, including:

[0045] Chain-type pre-cleaning: Silicon wafers are transported by conveyor rollers into the chain-type pre-cleaning functional area, first cleaned by NaOH solution with a concentration of 1% by mass percentage, washed with water, and then cleaned by HF solution with a concentration of 5% by mass percentage, washed with water and then baked Dry, used to remove organic matter, damaged layer, metal impurities and oxide layer on the surface of the silicon wafer;

[0046] Chain coating gettering source: After drying, the silicon wafer is transported into the functional area of ​​the chain coating gettering source through the conveying roller. The phosphorus-containing slurry on the surface of the silicon wafer is evenly coated, and the excess phosphorus-containing slurry is removed, and dri...

Embodiment 2

[0055] A method for preparing a high-efficiency heterojunction solar cell, specifically comprising the following steps:

[0056] (1) Full-chain gettering for N-type silicon wafers, including:

[0057] Chain pre-cleaning: Silicon wafers are transported by conveyor rollers into the chain pre-cleaning functional area, first cleaned by KOH solution with a concentration of 1% by mass percentage, washed with water, and then cleaned by HF solution with a concentration of 1% by mass percentage, washed with water and then baked Dry, used to remove organic matter, damaged layer, metal impurities and oxide layer on the surface of the silicon wafer;

[0058] Chain coating gettering source: After drying, the silicon wafer is transported into the functional area of ​​the chain coating gettering source by the conveyor roller. The surface of the silicon wafer is coated with a layer of phosphoric acid solution through the coating device, and the silicon wafer is squeezed by the conveyor roller t...

Embodiment 3

[0067] A method for preparing a high-efficiency heterojunction solar cell, specifically comprising the following steps:

[0068] (1) Full-chain gettering for N-type silicon wafers, including:

[0069] Chain-type pre-cleaning: Silicon wafers are transported into the chain-type pre-cleaning functional area by conveying rollers, firstly cleaned by NaOH solution with a concentration of 3% by mass percentage, washed with water, and then washed by HF solution with a concentration of 10% by mass percentage, washed with water and then baked Dry, used to remove organic matter, damaged layer, metal impurities and oxide layer on the surface of the silicon wafer;

[0070] Chain-type coating gettering source: After drying, the silicon wafer is transported into the functional area of ​​the chain-type coating gettering source through the conveying roller. The boron-containing slurry on the surface of the silicon wafer is evenly coated, the excess boron-containing slurry is removed, and drie...

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Abstract

The invention discloses an efficient heterojunction solar cell and a preparation method thereof, and the preparation method is characterized in that a gettering process is added before a conventionalheterojunction solar cell preparation process, and the gettering process is completed through a full-chain process; the full-chain process comprises the following steps: coating a gettering source ona silicon wafer in a chain manner; and performing chained high-temperature gettering. According to the preparation method, the conversion efficiency of the efficient heterojunction solar cell is improved by reducing the metal impurity content of the N-type silicon wafer; the efficiency distribution of the prepared efficient heterojunction solar cell is more centralized, and the product consistencyis greatly improved; the battery edge electric leakage rate is reduced, and the battery yield is improved; the full-chain gettering process shortens the circulation time of the silicon wafer in the manufacturing process, reduces the pollution probability of the silicon wafer, improves the conversion efficiency of the battery to a certain extent, and is short in time consumption, low in energy consumption, high in automation degree and beneficial to industrial popularization and application.

Description

technical field [0001] The invention relates to the technical field of solar cells, in particular to a high-efficiency heterojunction solar cell and a preparation method. Background technique [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 minority carrier life and no light-induced attenuation. They are also a new generation of cells that are entering mass production in the photovoltaic industry. technology. Among them, heterojunction solar cells have attracted widespread attention due to their high conversion efficiency and simple process. [0003] Since there is no high-temperature diffusion process in the traditional cell for gettering in the whole process of heterojunction solar cells, it is very important to introduce the gettering process into the preparation process of heterojunction s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01L31/18H01L31/074H01L31/0288
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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