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A processing method of inefficient solar cell sheets

A technology of solar cells and processing methods, which is applied in the direction of circuits, electrical components, sustainable manufacturing/processing, etc., can solve the problems of small fill factor FF of series resistance Rs and reduce conversion efficiency, etc., to reduce series resistance Rs and reduce contact Resistance, the effect of increasing conductivity

Inactive Publication Date: 2011-09-14
JETION SOLAR HLDG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] Due to the limitations of the current production process, a certain proportion of low-efficiency cells with large series resistance Rs and small fill factor FF will often appear in the cells produced by the above method. The existence of these low-efficiency cells also reduces the overall conversion efficiency

Method used

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  • A processing method of inefficient solar cell sheets
  • A processing method of inefficient solar cell sheets
  • A processing method of inefficient solar cell sheets

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Embodiment 1

[0038] Based on the above reasons, an embodiment of the present invention provides a method for processing low-efficiency solar cells. The flow chart of the method is as follows figure 1 shown, including the following steps:

[0039] Step S101: Screen low-efficiency solar cells from the finished solar cells. Generally, the low-efficiency solar cells are cells with a conversion efficiency lower than 16%. The factor is too small, which leads to low conversion efficiency;

[0040] Step S102: Put the selected low-efficiency solar cells into an annealing furnace for hydrogen annealing.

[0041] Those skilled in the art can understand that the series resistance Rs of the cell is too large, the parallel resistance Rsh is too small, the fill factor FF is too small, etc., all of which can lead to low efficiency of the solar cell. Therefore, to improve the conversion efficiency of the solar cell , can start from reducing the series resistance, increasing the parallel resistance and fi...

Embodiment 2

[0049] The flow chart of the method for processing low-efficiency solar cells disclosed in this embodiment is as follows: figure 2 As shown, this embodiment is more specific than the previous embodiment, including the following steps:

[0050] Step S201: Screen out the low-efficiency solar cells, and classify the low-efficiency solar cells according to the size of the series resistance, so as to make statistics on the influence of the hydrogen annealing process on the performance of the low-efficiency solar cells, and to facilitate the classification after annealing process to improve production efficiency;

[0051] Step S202: raising the temperature of the annealing furnace to within 300°C-400°C;

[0052] Step S203: feeding protective gas nitrogen and reaction gas hydrogen into the annealing furnace, wherein the speed of feeding nitrogen is within 30L / min-50L / min, and the speed of feeding hydrogen is within 3L / min-10L / min;

[0053] Step S204: Put the sorted low-efficiency ...

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Abstract

The invention discloses a processing method of inefficient solar cell sheets. The processing method comprises the steps of screening out inefficient solar cell sheets from solar cell sheet products, and disposing the inefficient solar cell sheets into an annealing furnace for annealing with hydrogen. In the embodiment of the invention, the inefficient cell sheets are annealed with hydrogen. Since hydrogen can reduce oxide on metal electrodes, the contact resistance between the metal electrodes and silicon is thereby reduced, and accordingly the total series resistance of the inefficient cell sheets is reduced. Moreover, since hydrogen possesses a passivation function, the electroactive impurities are passivated, the recombination rate of carriers on cell surfaces and the lifetime of minority carriers are prolonged. Therefore, the shunt resistance of the cell sheets is improved and the reverse leakage current density is reduced, accordingly the filling factors of the cell sheets are increased and the conversion efficiency is improved.

Description

technical field [0001] The invention relates to the production and processing of solar cells, more specifically, to a method for processing low-efficiency solar cells. Background technique [0002] In recent years, the production technology of solar cells has been continuously improved, the production cost has been continuously reduced, and the conversion efficiency has been continuously improved. The application of photovoltaic power generation has become increasingly popular and developed rapidly, and it has gradually become an important source of power supply. A solar cell is a photoelectric element with energy conversion, which can convert light energy into electrical energy under the irradiation of sunlight to realize photovoltaic power generation. The production process of solar cells is relatively complicated. Simply put, the current production process of solar cells can be divided into the following main steps: [0003] 1) Texture the surface and chemically clean th...

Claims

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Application Information

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IPC IPC(8): H01L31/18
CPCY02P70/50
Inventor 樊选东郭建东孙伟李建飞黄炯钰
Owner JETION SOLAR HLDG
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