A method and device for improving carrier decay of perc solar cells

A solar cell and carrier technology, applied in the field of solar cells, can solve the problems of low LID test temperature, inability to effectively reduce CID, and inability to fully expose the risk of high temperature attenuation of PERC cells, so as to improve conversion efficiency and reduce CID attenuation. rate effect

Active Publication Date: 2021-11-16
GUANGDONG AIKO SOLAR ENERGY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, the attenuation caused by LeTID, HID and metal impurities is not the same as that of LID; the test temperature of LID is relatively low, which cannot fully expose the risk of PERC battery high temperature attenuation
The inventor found through testing that: after conventional silicon wafers undergo LID attenuation treatment, although the LID attenuation is reduced to about 1%, the CID is still about 2-4%. It can be seen that the conventional LID treatment method cannot effectively reduce the CID

Method used

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  • A method and device for improving carrier decay of perc solar cells
  • A method and device for improving carrier decay of perc solar cells
  • A method and device for improving carrier decay of perc solar cells

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0104] This embodiment provides a method for improving carrier decay of a PERC solar cell, which specifically includes the following steps:

[0105] (1) reduce the light-induced attenuation of solar cells;

[0106] Specifically, use the method of ZL201811542505.5 to reduce the light-induced attenuation of solar cells; after this step, the LID is 0.9%; the CID is 2.3%;

[0107] (2) annealing the solar cell at 350°C;

[0108] Specifically, including:

[0109] (2.1) The solar cell is heated up to 350°C at a rate of 33°C / s, and the heating time is 10s;

[0110] (2.2) Insulate at 350°C for 4s;

[0111] (2.3) Cool the solar cell to 50°C at a rate of 10°C / s, and the cooling time is 30s.

[0112] (3) Preheat the solar cell to 350°C;

[0113] Among them, the heating rate is 30°C / s, and the preheating time is 10s;

[0114] (4) performing the first light treatment on the solar cell within the first temperature range for the first time;

[0115] Wherein, the first temperature range...

Embodiment 2

[0126] This embodiment provides a method for improving carrier decay of a PERC solar cell, which specifically includes the following steps:

[0127] (1) reduce the light-induced attenuation of solar cells;

[0128] Specifically, use the method of ZL201610091453.9 to reduce the light-induced attenuation of solar cells; after this step, the LID is 1.1%; the CID is 3.5%;

[0129] (2) annealing the solar cell at 400°C;

[0130] Specifically, including:

[0131] (2.1) The solar cell is heated up to 400°C at a rate of 25°C / s, and the heating time is 15s;

[0132] (2.2) Insulate at 400°C for 5s;

[0133] (2.3) Cool the solar cell to 58°C at a rate of 6°C / s, and the cooling time is 57s.

[0134] (3) Preheat the solar cell to 340°C;

[0135] Among them, the heating rate is 40°C / s, and the preheating time is 7s;

[0136] (4) performing the first light treatment on the solar cell within the first temperature range for the first time;

[0137] Wherein, the first temperature range i...

Embodiment 3

[0148] This embodiment provides a method for improving carrier decay of a PERC solar cell, which specifically includes the following steps:

[0149] (1) reduce the light-induced attenuation of solar cells;

[0150] Specifically, use the method of ZL201610091453.9 to reduce the light-induced attenuation of solar cells; after this step, the LID is 1.1%; the CID is 3.5%;

[0151] (2) annealing the solar cell at 400°C;

[0152] Specifically, including:

[0153] (2.1) The solar cell is heated up to 400°C at a rate of 25°C / s, and the heating time is 15s;

[0154] (2.2) Insulate at 400°C for 5s;

[0155] (2.3) Cool the solar cell to 30°C at a rate of 5°C / s, and the cooling time is 74s.

[0156] (3) Preheat the solar cell to 340°C;

[0157] Among them, the heating rate is 40°C / s, and the preheating time is 7s;

[0158] (4) performing the first light treatment on the solar cell within the first temperature range for the first time;

[0159] Wherein, the first temperature range i...

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Abstract

The invention discloses a method for improving carrier attenuation of PERC solar cells, which comprises: (1) reducing the light-induced attenuation of solar cells; (2) annealing solar cells at 300-600°C; (3) annealing The final solar cell is preheated to 250-450° C.; (4) the solar cell is subjected to the first light treatment in the first temperature range for the first time; (5) the solar cell is subjected to the second light treatment in the second temperature range. Illumination treatment lasts for a second time; (6) passing current to the solar cell after the second illumination treatment; (7) cooling the solar cell to room temperature. Through the process of annealing, preheating, high-temperature photothermal treatment, low-temperature photothermal treatment, electrical injection and cooling, the present invention effectively reduces hydrogenation attenuation and attenuation caused by impurities, and at the same time promotes the regeneration and recovery of H and B-O complexes from unstable states In order to passivate the stable state, thereby effectively reducing the CID decay rate of the solar cell, and improving its conversion efficiency and reliability.

Description

technical field [0001] The invention relates to the field of solar cells, in particular to a method and equipment for improving carrier attenuation of PERC solar cells. Background technique [0002] At present, the mainstream products in the solar cell industry have been upgraded from traditional Al-BSF (Aluminum Back Field Contact) cells to PERC (Passivated Emitter Rear Cell) solar cells. The point contact greatly reduces the back recombination loss of the solar cell, increases the open circuit voltage of the solar cell, and significantly improves the efficiency of the solar cell. [0003] High-efficiency PERC back passivation solar cells are representative of the combination of back passivation and local heavy doping technology in the metallization region. At the same time, a strong back surface reflector is formed to increase the probability of electron collection; the front and rear surface defects of the solar cell are well passivated, the open circuit voltage of the s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01L31/18
CPCH01L31/186H01L31/1864Y02E10/50Y02P70/50
Inventor 杨苏平黄石明曾超李娟林纲正陈刚
Owner GUANGDONG AIKO SOLAR ENERGY TECH CO LTD
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