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Method for weakening light attenuation of polycrystalline silicon solar cell

A technology for solar cells and solar cells, applied in the field of photovoltaic solar energy, can solve the problems of complex production process, lowering the maximum sintering temperature and cooling rate, complex equipment and operation process, etc., and achieve the effect of simple operation process and low equipment requirements

Active Publication Date: 2019-12-31
HANGZHOU DIANZI UNIV
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AI Technical Summary

Problems solved by technology

The previous article reported that high light intensity, such as 44 suns, can be used to reduce the degree of light decay of polycrystalline silicon solar cells, but the manufacturing process of the equipment is relatively complicated, and a large amount of heat will be generated during the processing, requiring the manufacture of special cooling devices , which greatly complicates the equipment and operation process
Another article also reported that the temperature change of the sintering process can be changed to reduce the maximum sintering temperature and cooling rate, and the light decay of polysilicon PERC cells can be reduced by about 2%, but this method changes the traditional processing technology of polysilicon PERC cells , which complicates the production process

Method used

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  • Method for weakening light attenuation of polycrystalline silicon solar cell

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] (1) Place the PERC polysilicon solar cell on the heater, heat the heater to 175°C, then apply a forward voltage of 1V to the polysilicon solar cell for 10 minutes, and then take the polysilicon solar cell out of the heater.

[0018] (2) Heat the heater to 400°C, place the polycrystalline silicon solar cell on the heater again, apply a reverse voltage of 0.3V to the polycrystalline silicon solar cell, and process for 1 minute, then take the polycrystalline silicon solar cell out of the heater.

[0019] The control sample is a PERC polysilicon solar cell without any treatment.

[0020] figure 1 It is the voltage change situation of the light decay of the untreated polysilicon PERC solar cell after the treatment of Example 1 and the control sample;

[0021] figure 2 It is the variation of light decay efficiency of polysilicon PERC solar cells treated in Example 1 and untreated polysilicon PERC solar cells in the control sample.

Embodiment 2

[0023] Others are the same as in Embodiment 1, the applied forward voltages are respectively 2V and 4V, which can reduce the degree of light attenuation to less than 1.5% and less than 1% respectively.

Embodiment 3

[0025] Others are the same as in Example 1. In step 1, the heaters are heated to 150° C. and 250° C. respectively, both of which can reduce the degree of light attenuation to below 1%.

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Abstract

The invention discloses a method for weakening light attenuation of a polycrystalline silicon solar cell. The method comprises the following steps: placing the PERC polycrystalline silicon solar cellunder a temperature of 150-250 DEG C and forwardly applying a voltage of 1-4V, and carrying out processing for 10 minutes; and then, placing the polycrystalline silicon solar cell under a temperatureof 300-550 DEG C and reversely applying a voltage of 0.2-2V, and carrying out processing for 1 minute. The method can reduce the light attenuation of the polycrystalline silicon solar cell to less than 1%; and the method can also realize a certain degree of grain boundary passivation of the polycrystalline silicon solar cell.

Description

technical field [0001] The invention belongs to the field of photovoltaic solar energy, and in particular relates to a method for reducing the degree of light attenuation of a polycrystalline silicon cell by using a heating process in which forward and reverse voltages are alternately changed. Background technique [0002] Polysilicon cells, especially polysilicon PERC cells, are facing serious light attenuation problems, and the degree of light attenuation can reach more than 10% within 1000 hours, which has affected the efficiency of polysilicon solar cells. At present, the light decay phenomenon of polycrystalline silicon solar cells is being intensively studied. The previous article reported that high light intensity, such as 44 suns, can be used to reduce the degree of light decay of polycrystalline silicon solar cells, but the manufacturing process of the equipment is relatively complicated, and a large amount of heat will be generated during the processing, requiring ...

Claims

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Application Information

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IPC IPC(8): H01L31/18
CPCH01L31/1804Y02E10/547Y02P70/50
Inventor 宋立辉余学功杨德仁
Owner HANGZHOU DIANZI UNIV
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