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A method for reducing light attenuation of a polycrystalline PERC battery by moving forward a sintering peak temperature region

A technology of sintering zone and temperature zone, which is applied in the direction of circuits, photovoltaic power generation, electrical components, etc., can solve the problem of serious light decay of polycrystalline PERC cells, and achieve the goals of avoiding the enrichment of copper atoms, strong practicability, and solving the problem of light decay Effect

Inactive Publication Date: 2018-12-11
TONGWEI SOLAR HEFEI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The peak temperature of the traditional sintering process directly enters the cooling zone, and rapid cooling leads to copper enrichment and the formation of recombination centers. Since the impurity content of polycrystalline is higher than that of single crystal, the light decay of polycrystalline PERC cells is more serious, and the light decay of 5Kwh light reaches 3 %-4% attenuation ratio

Method used

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  • A method for reducing light attenuation of a polycrystalline PERC battery by moving forward a sintering peak temperature region
  • A method for reducing light attenuation of a polycrystalline PERC battery by moving forward a sintering peak temperature region
  • A method for reducing light attenuation of a polycrystalline PERC battery by moving forward a sintering peak temperature region

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Embodiment 1

[0027] As attached to the manual image 3 As shown, the sintering furnace is a new type 9-temperature zone sintering furnace 3, and the process parameters are adjusted as follows: Drying zone: There are three temperature zones, which are respectively 240°C, 260°C and 280°C;

[0028] Sintering zone: There are six temperature zones, respectively 570°C, 650°C, 720°C, 800°C, 920°C and 730°C.

[0029] The belt speed of the new 9-temperature zone sintering furnace 3 is 6.25m / min. Through the belt speed transmission of the conveyor belt, the battery is driven to pass through the drying zone and the sintering zone in sequence to realize sintering. Moreover, the peak temperature zone of the sintering zone is 920°C, located in the six The fifth place in the first sintering temperature zone, followed by a temperature zone of 730 ° C, that is, the peak temperature zone is moved forward by one temperature zone.

Embodiment 2

[0031] As attached to the manual Figure 4 As shown, the sintering furnace is a new type 13 temperature zone sintering furnace 4, and the process parameters are adjusted as follows: Drying zone: There are six temperature zones, which are respectively 210°C, 210°C, 220°C, 220°C, 230°C and 230°C ℃;

[0032] Sintering zone: There are seven temperature zones, respectively 420°C, 455°C, 480°C, 550°C, 650°C, 890°C and 690°C.

[0033] The belt speed of the new 13-temperature zone sintering furnace 4 is 6.25m / min. Through the belt speed transmission of the conveyor belt, the battery is driven to pass through the drying zone and the sintering zone in sequence to achieve sintering. The peak temperature zone of the sintering zone is 890°C, located in the seven The sixth place of the first sintering temperature zone, followed by a temperature zone of 690 ° C, that is, the peak temperature zone is moved forward by one temperature zone.

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Abstract

The invention discloses a method for reducing light attenuation of a polycrystalline PERC battery by moving forward a sintering peak temperature region. By adjusting process parameters, and moving forward a temperature region of the sintering region in a sintering furnace, a temperature region lower than the peak temperature region is arranged behind the peak temperature region. The invention makes the polycrystalline battery use the slow cooling process by adopting the method of moving the peak temperature region of the sintering region forward, The copper atom enrichment caused by rapid cooling is effectively avoided, and the composite center formation is avoided, so as to solve the problem of light decay of polycrystalline PERC, and effectively reduce the light decay of polycrystallinePERC battery, so that the light decay of 5Kwh light can be reduced to about 1.08%, and the utility is very strong, the method is very worthy of popularization.

Description

technical field [0001] The invention relates to the technical field of sintering technology, in particular to a method for reducing light attenuation of a polycrystalline PERC cell by moving forward the sintering peak temperature range. Background technique [0002] The two main factors affecting the light-induced attenuation of P-type silicon cells are the light-induced attenuation caused by boron-oxygen complexes and the light-induced attenuation caused by copper atom impurities. It is well known that P-type crystalline silicon cells generally have light-induced attenuation effects, but PERC cells are relatively Compared with conventional cells, the light decay is higher, especially for polycrystalline PERC cells, which is about 50-100% higher than conventional polycrystalline cells. This phenomenon is mainly due to the difference in the gettering process between PERC batteries and conventional batteries. Conventional batteries are front-phosphorus and back-aluminum getter...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01L31/18H01L31/068
CPCH01L31/068H01L31/186H01L31/1864Y02E10/547Y02P70/50
Inventor 潘勇王冲晁稳王长春
Owner TONGWEI SOLAR HEFEI