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Sintering method for reducing PERC battery aluminum cavities

A sintering method, aluminum void technology, applied in the direction of circuits, photovoltaic power generation, electrical components, etc., to achieve the effect of improving battery efficiency

Active Publication Date: 2019-06-14
HANWHA SOLARONE QIDONG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In view of this, in order to overcome the defects of the prior art, the object of the present invention is to provide a sintering method for improving aluminum voids in PERC cells, the silicon wafer obtained by the sintering method can effectively solve the problem of aluminum voids, improve the aluminum-silicon Contact performance, increase the thickness of LBSF and improve passivation effect, improve battery efficiency

Method used

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  • Sintering method for reducing PERC battery aluminum cavities
  • Sintering method for reducing PERC battery aluminum cavities
  • Sintering method for reducing PERC battery aluminum cavities

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Such as figure 1 and Figure 3-4 As shown, a sintering method for improving PERC battery aluminum voids in this embodiment includes the following steps:

[0029] Step 1: According to the battery process, the original silicon wafer is cleaned and textured from one time to the back plated with passivation and anti-reflection film and front anti-reflection film, and then the back is grooved by laser equipment, and the corresponding power is selected according to the requirements of the PERC process for different graphics ( Dot / Dash / Line, etc.) slotting.

[0030] Step 2: The grooved silicon wafers are printed with back silver back aluminum front silver paste in the screen printing equipment, and the printed silicon wafers are fed to the sintering equipment (Despatch) with the blue film face up and the aluminum paste face down That is, sintering is carried out in the sintering furnace tube. The sintering equipment includes a low-temperature drying zone and a high-temperatu...

Embodiment 2

[0037] Embodiment 2 result and discussion

[0038] (1) The detection of the battery sheet produced by using Example 1 and the battery sheet produced by the traditional process of Comparative Example 1 is carried out, and the SEM section is analyzed for aluminum voids and LBSF. The results are shown in Figure 2-4 .

[0039] figure 2 The results show that the LBSF layer of the battery sheet prepared by the traditional sintering method is thin and uneven, and the Al-Si alloy layer has aluminum voids.

[0040] image 3 The results show that using the sintering method with temperature difference in Example 1 can obtain aluminum-free voids and a thicker and uniform LBSF, further improving the efficiency of solar cells.

[0041] Figure 4 The aluminum-silicon phase diagram shows that the aluminum-silicon phase undergoes liquid-solid transition along the solidus line according to F (960 ° C) → E (577 ° C), and the aluminum-silicon LBSF → aluminum-silicon alloy → aluminum layer c...

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Abstract

The invention discloses a sintering method for reducing PERC battery aluminum cavities. The sintering method comprises the steps that a silicon slice with printed paste is despatched into sintering equipment for sintering, and the sintering temperature on the front of the silicon slice is set to be lower than the set sintering temperature on the back of the silicon slice. According to the sintering method for reducing the PERC battery aluminum cavities, non-isothermal sintering of the front and the back of the silicon slice is set through thermocouple temperature control, common PERC aluminumcavities are avoided, aluminum-silicon contact is improved, the thickness of an LBSF is increased, and the passivation effect is improved. Through the preparation method, the problems of aluminum cavities, small LBSF thickness and poor quality brought by traditional PERC sintering are solved and relieved, and the efficiency of a PERC battery without aluminum cavities is further improved.

Description

technical field [0001] The invention relates to the technical field of solar cell manufacturing, in particular to a sintering method for improving aluminum voids in PERC cells. Background technique [0002] Solar photovoltaic power generation, due to its clean, safe, convenient and high-efficiency characteristics, has become an emerging industry that is widely concerned and focused on development all over the world. Therefore, the production of crystalline silicon solar cells has developed rapidly in recent years, and the demand for photovoltaic power plants and distributed applications is also very large. [0003] With the rapid development of photovoltaic technology, the balance optimization of passivation and contact has continuously improved the efficiency of photovoltaic cells. In order to reduce the recombination rate on the back of the silicon wafer and reduce the minority carrier recombination, the P-type aluminum back field field BSF reduces the Srear recombination...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01L31/0224H01L31/068H01L31/18
CPCY02E10/547Y02P70/50
Inventor 李懋鸿赵福祥崔钟亨陈坤费存勇
Owner HANWHA SOLARONE QIDONG
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