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A method, equipment and solar cell for reducing carrier decay of solar cells

A technology of solar cells and carriers, applied in the field of solar cells, can solve the problems of low test temperature of LID, inability to effectively reduce CID, and inability to fully expose the risk of high temperature attenuation of PERC cells, so as to reduce carrier attenuation, Effect of reducing CID decay rate

Active Publication Date: 2021-08-10
GUANGDONG AIKO SOLAR ENERGY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] 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, equipment and solar cell for reducing carrier decay of solar cells

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0076] This embodiment provides a method for reducing the attenuation of carriers in solar cells, which specifically includes the following steps:

[0077] (1) Reduce the light-induced attenuation of solar cells;

[0078] 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%;

[0079] (2) Annealing the solar cells at 350°C;

[0080] Specifically, including:

[0081] (2.1) Heat up the solar cells to 350°C at a rate of 33°C / s, and the heating time is 10s;

[0082] (2.2) Insulate at 350°C for 4s;

[0083] (2.3) Cool the solar cells to 50°C at a rate of 10°C / s, and the cooling time is 30s.

[0084] (3) Preheat the solar cells to 350°C;

[0085]Among them, the heating rate is 30°C / s, and the preheating time is 10s;

[0086] (4) performing the first light treatment on the solar cells within the first temperature range for the first time;

[0087] Wherein, the first temperature...

Embodiment 2

[0091] This embodiment provides a method for reducing the attenuation of carriers in solar cells, which specifically includes the following steps:

[0092] (1) Reduce the light-induced attenuation of solar cells;

[0093] 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%;

[0094] (2) Annealing the solar cells at 400°C;

[0095] Specifically, including:

[0096] (2.1) Heat up the solar cells to 400°C at a rate of 25°C / s, and the heating time is 15s;

[0097] (2.2) Insulate at 400°C for 5s;

[0098] (2.3) Cool the solar cells to 58°C at a rate of 6°C / s, and the cooling time is 57s.

[0099] (3) Preheat the solar cells to 340°C;

[0100] Among them, the heating rate is 40°C / s, and the preheating time is 7s;

[0101] (4) performing the first light treatment on the solar cells within the first temperature range for the first time;

[0102] Wherein, the first temperature ...

Embodiment 3

[0106] This embodiment provides a method for reducing the attenuation of carriers in solar cells, which specifically includes the following steps:

[0107] (1) Reduce the light-induced attenuation of solar cells;

[0108] 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%;

[0109] (2) Annealing the solar cells at 400°C;

[0110] Specifically, including:

[0111] (2.1) Heat up the solar cells to 400°C at a rate of 25°C / s, and the heating time is 15s;

[0112] (2.2) Insulate at 400°C for 5s;

[0113] (2.3) Cool the solar cells to 30°C at a rate of 5°C / s, and the cooling time is 74s.

[0114] (3) Preheat the solar cells to 340°C;

[0115] Among them, the heating rate is 40°C / s, and the preheating time is 7s;

[0116] (4) performing the first light treatment on the solar cells within the first temperature range for the first time;

[0117] Wherein, the first temperature ...

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Abstract

The invention discloses a method for reducing carrier attenuation of a solar cell, which comprises: (1) reducing the light-induced attenuation of the solar cell; (2) annealing the solar cell at 300-600°C; (3) Preheating the solar cells to 250‑450°C; (4) performing the first light treatment on the solar cells within the first temperature range for the first time; (5) performing the first light treatment on the solar cells within the second temperature range The second light treatment lasts for a second time; wherein, the highest temperature in the first temperature range ≥ the highest temperature in the second temperature range; the first time ≤ the second time. Through the process of annealing, preheating, high-temperature photothermal treatment, and low-temperature photothermal treatment, the present invention effectively reduces hydrogenation attenuation and carrier attenuation caused by impurities, and at the same time promotes the restoration of H and B-O complexes from unstable state regeneration to passivation stable state, thereby effectively reducing the CID decay rate of the solar cell.

Description

technical field [0001] The invention relates to the field of solar cells, in particular to a method, equipment and solar cells for reducing carrier attenuation of solar cells. Background technique [0002] With the rapid development of the photovoltaic industry, the mainstream products of solar cells have been fully switched from traditional aluminum back-field cells to high-efficiency PERC cells, and the conversion efficiency has been greatly improved. However, with the continuous improvement of cell efficiency, the quality and reliability requirements of high-efficiency solar cell components are becoming increasingly stringent, and carrier-induced degradation (CID: Carrier Induced Degradation) has gradually become one of the key issues restricting the development of the photovoltaic industry. [0003] CID refers to the power attenuation phenomenon caused by solar cells and components during the carrier injection process. At present, there is no consensus on the attenuatio...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01L31/18H01L31/068
CPCH01L31/068H01L31/1804H01L31/1864H01L31/1868Y02E10/547Y02P70/50
Inventor 杨苏平黄石明尧海华周文远林纲正陈刚
Owner GUANGDONG AIKO SOLAR ENERGY TECH CO LTD
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