Method and equipment for improving carrier attenuation of PERC solar cell

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 reduce the CID attenuation rate and improve conversion. The effect of efficiency

Active Publication Date: 2020-05-08
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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  • Method and equipment for improving carrier attenuation of PERC solar cell
  • Method and equipment for improving carrier attenuation of PERC solar cell
  • Method and equipment for improving carrier attenuation of PERC solar cell

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 a PERC solar cell. The method comprises the steps of (1) reducing light-induced attenuation of the solar cell; (2) annealing the solar cell at a temperature of 300-600 DEG C; (3) preheating the annealed solar cell to a temperature of 250-450 DEG C; (4) carrying out first illumination treatment on the solar cell in a first temperature range for a first time; (5) carrying out second illumination treatment on the solar cell in a second temperature range for a second time; (6) introducing current into the solar cell subjected tothe second illumination treatment; and (7) cooling the solar cell to room temperature. Through the steps of annealing, preheating, high-temperature photo-thermal treatment, low-temperature photo-thermal treatment, electric injection and cooling, hydrogenation attenuation and attenuation caused by impurities are effectively reduced, and regeneration and recovery of the H and B-O complex from an unstable state to a passivated stable state are promoted, so that the CID attenuation rate of the solar cell is effectively reduced, and the conversion efficiency and reliability of the solar cell are improved.

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 Applications(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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