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Light injection passivation method of Topcon cell

A light injection and battery technology, applied in circuits, electrical components, photovoltaic power generation, etc., can solve problems such as unstable efficiency improvement, achieve the effect of improving surface passivation and conversion efficiency

Active Publication Date: 2021-05-07
东方日升(江苏)新能源有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the applicant found in the research that Topcon batteries are prone to the problem of unstable efficiency improvement in the process of using electric injection passivation

Method used

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  • Light injection passivation method of Topcon cell
  • Light injection passivation method of Topcon cell

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] This embodiment provides a light injection passivation method for a Topcon battery, which includes:

[0035]Put the metallized Topcon cells one by one along the transmission direction into the chain conveyor belt for transmission. During the transmission process, the metallized Topcon cells are injected with light and supplemented by heating to achieve passivation. The radiation intensity of the light injection is 2suns, the light injection time is 200s.

[0036] Among them, the heating process includes a heating stage, a cooling stage and a heat preservation stage. The heating stage includes heating the Topcon battery to a surface temperature of 300°C in 50s, and the cooling stage includes reducing the surface temperature of the Topcon battery from 300°C to 300°C in 84s. 200°C, in the heat preservation stage, the Topcon battery is held at a temperature of 200°C for 66s.

Embodiment 2

[0038] This embodiment provides a light injection passivation method for a Topcon battery, which includes:

[0039] Put the metallized Topcon cells one by one along the transmission direction into the chain conveyor belt for transmission. During the transmission process, the metallized Topcon cells are injected with light and supplemented by heating to achieve passivation. The radiation intensity of the light injection is 5suns, the light injection time is 200s.

[0040] Among them, the heating process includes a heating stage, a cooling stage and a heat preservation stage. The heating stage includes heating the Topcon battery to a surface temperature of 300°C in 50s, and the cooling stage includes reducing the surface temperature of the Topcon battery from 300°C to 300°C in 84s. 200°C, in the heat preservation stage, the Topcon battery is held at a temperature of 200°C for 66s.

Embodiment 3

[0042] This embodiment provides a light injection passivation method for a Topcon battery, which includes:

[0043] Put the metallized Topcon cells one by one along the transmission direction into the chain conveyor belt for transmission. During the transmission process, the metallized Topcon cells are injected with light and supplemented by heating to achieve passivation. The radiation intensity of the light injection is 8suns, the light injection time is 200s.

[0044] Among them, the heating process includes a heating stage, a cooling stage and a heat preservation stage. The heating stage includes heating the Topcon battery to a surface temperature of 300°C in 50s, and the cooling stage includes reducing the surface temperature of the Topcon battery from 300°C to 300°C in 84s. 200°C, in the heat preservation stage, the Topcon battery is held at a temperature of 200°C for 66s.

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Abstract

The invention discloses a light injection passivation method of a Topcon cell, and belongs to the technical field of Topcon solar cells. The light injection passivation method of the Topcon cell comprises the steps that light injection is carried out on a metalized Topcon cell, heating is assisted to achieve passivation, the radiation intensity of light injection is 2-10 suns, and the time of light injection is 100-300 s. A heating process comprises a heating stage, a cooling stage and a heat preservation stage, the heating stage comprises heating the Topcon battery until the surface temperature is a first temperature, the cooling stage comprises reducing the surface temperature of the Topcon battery from the first temperature to a second temperature, the heat preservation stage comprises carrying out heat preservation on the Topcon battery at the second temperature, the first temperature is 300-650 DEG C, and the second temperature is 200-250 DEG C. According to the method, the conversion efficiency of the Topcon battery can be effectively improved.

Description

technical field [0001] This application relates to the technical field of Topcon solar cells, in particular, to a light injection passivation method for Topcon cells. Background technique [0002] Topcon battery is to make a layer of tunnel oxide layer and doped polysilicon layer on the back of the battery. The two layers of tunnel oxide layer and doped polysilicon layer together form a passivation contact structure, which provides good surface passivation for the back of the silicon wafer. . The tunneling oxide layer can allow electrons to tunnel into the doped polysilicon layer while blocking hole recombination, and then the electrons are transported laterally in the polysilicon layer and collected by the metal, thereby greatly reducing the metal contact recombination current and improving the open circuit voltage and short circuit current of the battery. [0003] In the prior art, the H passivation of the Topcon battery is usually realized by means of electric injection,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01L31/18H01L31/042
CPCH01L31/1868H01L31/042Y02E10/50
Inventor 杨斌万义茂袁声召
Owner 东方日升(江苏)新能源有限公司
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