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Method for improving PERC (passivated emitter rear contact) battery back slotting contact

A back and battery technology, applied in the field of solar cells, can solve problems such as thermal damage, reduced minority carrier life, and poor battery performance, and achieve the effects of reducing production costs, improving matching, and reducing fragmentation rates.

Inactive Publication Date: 2014-12-10
ZHEJIANG JINKO SOLAR CO LTD +1
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Problems solved by technology

The disadvantages of the chemical etching method are: the operation process is complicated, it will also bring some pollution of metal ion impurities, and the chemicals are harmful to the environment
Disadvantages of laser slotting: Laser slotting is used before screen printing. After screen printing and sintering, the passivation effect near the slot is deteriorated, and it is easy to form voids at the BSF, and laser slotting is easy to cause thermal damage. It will greatly reduce the life of the minority and make the performance of the battery worse

Method used

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  • Method for improving PERC (passivated emitter rear contact) battery back slotting contact

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Embodiment Construction

[0010] as attached figure 1 Shown is a method for improving PERC battery back slot contact, including silicon wafer polishing, texturing, diffusion, edge removal and PSG removal, double-sided passivation, screen printing electrodes and sintering steps in sequence, characterized in that : After the step of de-edge junction and PSG removal, the step of screen-printing Al paste on the back and forming a grid-shaped aluminum back field is added, and after the silicon wafer prepared with a grid-shaped aluminum back field is passivated, the back electrode is printed on the back The busbar burns through the passivation layer so as to be in contact with the grid line-shaped aluminum back field, which can fully collect carriers and save the back slotting step after the conventional double-sided passivation step; the grid line-shaped aluminum back field is composed of It consists of a number of neatly arranged thin grid lines 1 . The side length of the grid-shaped aluminum back field i...

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Abstract

The invention discloses a method for improving PERC (passivated emitter and rear cell) cell back slot contact. The method includes the sequential steps of silicon wafer polishing, texturing, diffusion, edge etching and PSG (phospho silicate glass) removal, two-side passivation, electrode screen printing and sintering. The method is characterized in that a step where back screen printing of Al paste is performed to form a grating aluminum back field is added to the step of edge etching and PSG removal; after a silicon wafer with the grating aluminum back field is passivated, a main gate of the a back printed electrode burns through a passivation layer to be in contact with the grating aluminum back field; current carriers can be fully collected, and the step of back slotting before the conventional two-side passivation step is omitted; the grating aluminum back field is composed of a plurality of fine gratings arranged in order. The method has the advantages that the step of PERC cell back slotting is omitted, the process is simple, production efficiency is improved, manufacturing cost is lowered, and the performance is better.

Description

technical field [0001] The invention relates to the technical field of solar cells, in particular to a method for improving the slotted contact on the back of PERC cells. Background technique [0002] The conventional preparation process of the existing PERC cell includes: silicon wafer polishing, texturing, diffusion, edge removal and PSG removal, double-sided passivation, back groove, screen printing electrode and sintering steps. Among them, the back groove is to realize the back contact of the PERC battery and form the back electrode. The quality of the groove directly affects the performance of the battery. Generally, laser and chemical etching are used for groove. The disadvantages of the chemical etching method are: the operation process is complicated, and it will also bring some pollution of metal ion impurities, and the chemicals will cause harm to the environment. Disadvantages of laser slotting: Laser slotting is used before screen printing. After screen printin...

Claims

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Application Information

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IPC IPC(8): H01L21/768H01L31/18
CPCH01L31/02245Y02P70/50
Inventor 郝彦磊蒋方丹金浩陈康平
Owner ZHEJIANG JINKO SOLAR CO LTD
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