Method for improving abnormal crystalline silicon solar cell

Abstract

The invention belongs to the technical fields of semiconductor crystalline silicon and solar cell manufacture, and discloses a method for improving an abnormal crystalline silicon solar cell. The method comprises the following steps of: impregnating the abnormal cell in a hydrofluoric (HF) acid at the mass concentration of 1 to 5 percent for 30 to 90 seconds, rinsing the abnormal cell by using de-ionized water, and blow-drying the abnormal cell by using nitrogen. By the method, sintering shortcomings can be effectively overcome, and the photoelectric conversion efficiency of a crystalline silicon solar cell can be improved by over 1 percent, so that the qualified rate of the cell is increased. The method is low in time consumption, high in processing efficiency and operability, low in cost and in no need of large-scale equipment.

Description

technical field

[0001] The invention belongs to the technical field of semiconductor crystalline silicon and solar cell manufacturing, and relates to a method for improving abnormal sheets in crystalline silicon solar cells, which can improve the pass rate and photoelectric conversion efficiency of products. Background technique

[0002] In the solar cell sorting test, abnormal pieces often appear. The specific form of abnormal film is: large series resistance Rs (Rs greater than 10mΩ), small fill factor FF (normal FF=70%-75%), according to the classification rules, it belongs to TRASH film. Take the abnormal piece into the sintering furnace for reburning, aluminum beads are produced on the back, and the efficiency is not improved much.

[0003] At present, there is an annealing furnace to improve the sintering situation, which can improve the passivation effect of the cell. Ordinary hydrogen annealing furnaces have the following disadvantages: 1. It is not conducive to la...

Examples

Embodiment 1

[0018] The present invention is described by taking a single crystal as an example.

[0019] The electrical performance parameters of the abnormal sheet 1 are as follows: the series resistance Rs is 21 mΩ, the fill factor FF is 69.5%, and the efficiency is 15.93%.

[0020] After immersing the abnormal sheet in HF acid with a mass concentration of 5% for 30 seconds, rinse it with deionized water (60 seconds), and blow it dry with nitrogen; take the processed battery sheet to the sorting tester for re-sorting Selected test, the results are shown in Table 1, the product is qualified. It can be seen that the present invention can obviously improve the abnormality of the solar cells, increase the photoelectric conversion efficiency of the cells (increase by 1.5%), and improve the qualified rate of finished products. The method is time-consuming, has high processing efficiency, and is highly operable.

Embodiment 2

[0022] The present invention is described by taking a single crystal as an example.

[0023] The electrical performance parameters of the abnormal sheet 2 are as follows: the series resistance Rs is 12 mΩ, the fill factor FF is 70.2%, and the efficiency is 16.05%.

[0024] After immersing the abnormal sheet in HF acid with a mass concentration of 3% for 60 seconds, rinse it with deionized water (55 seconds), and blow it dry with nitrogen; take the processed battery sheet to the sorting tester for re-sorting Selected test, the results are shown in Table 1, the product is qualified. It can be seen that the present invention can obviously improve the abnormality of the solar cells, increase the photoelectric conversion efficiency of the cells (increase by 1.55%), and improve the qualified rate of finished products. The method is time-consuming, has high processing efficiency, and is highly operable.

Embodiment 3

[0026] The present invention is described by taking a single crystal as an example.

[0027] The electrical performance parameters of the abnormal sheet 3 are as follows: the series resistance Rs is 10 mΩ, the fill factor FF is 71%, and the efficiency is 16.2%.

[0028] After immersing the abnormal sheet in HF acid with a mass concentration of 1.5% for 90 seconds, rinse it with deionized water (65 seconds), and blow it dry with nitrogen; take the processed battery sheet to the sorting tester for re-sorting Selected test, the results are shown in Table 1, the product is qualified. It can be seen that the present invention can obviously improve the abnormality of the solar cells, increase the photoelectric conversion efficiency of the cells (increase by 1.5%), and improve the qualified rate of finished products. The method is time-consuming, has high processing efficiency, and is highly operable.

[0029] Table 1 Use HF acid to improve the electrical performance parameters of ...

technical field

[0001] The invention belongs to the technical field of semiconductor crystalline silicon and solar cell manufacturing, and relates to a method for improving abnormal sheets in crystalline silicon solar cells, which can improve the pass rate and photoelectric conversion efficiency of products. Background technique

[0002] In the solar cell sorting test, abnormal pieces often appear. The specific form of abnormal film is: large series resistance Rs (Rs greater than 10mΩ), small fill factor FF (normal FF=70%-75%), according to the classification rules, it belongs to TRASH film. Take the abnormal piece into the sintering furnace for reburning, aluminum beads are produced on the back, and the efficiency is not improved much.

[0003] At present, there is an annealing furnace to improve the sintering situation, which can improve the passivation effect of the cell. Ordinary hydrogen annealing furnaces have the following disadvantages: 1. It is not conducive to la...

Examples

Embodiment 1

[0018] The present invention is described by taking a single crystal as an example.

[0019] The electrical performance parameters of the abnormal sheet 1 are as follows: the series resistance Rs is 21 mΩ, the fill factor FF is 69.5%, and the efficiency is 15.93%.

[0020] After immersing the abnormal sheet in HF acid with a mass concentration of 5% for 30 seconds, rinse it with deionized water (60 seconds), and blow it dry with nitrogen; take the processed battery sheet to the sorting tester for re-sorting Selected test, the results are shown in Table 1, the product is qualified. It can be seen that the present invention can obviously improve the abnormality of the solar cells, increase the photoelectric conversion efficiency of the cells (increase by 1.5%), and improve the qualified rate of finished products. The method is time-consuming, has high processing efficiency, and is highly operable.

Embodiment 2

[0022] The present invention is described by taking a single crystal as an example.

[0023] The electrical performance parameters of the abnormal sheet 2 are as follows: the series resistance Rs is 12 mΩ, the fill factor FF is 70.2%, and the efficiency is 16.05%.

[0024] After immersing the abnormal sheet in HF acid with a mass concentration of 3% for 60 seconds, rinse it with deionized water (55 seconds), and blow it dry with nitrogen; take the processed battery sheet to the sorting tester for re-sorting Selected test, the results are shown in Table 1, the product is qualified. It can be seen that the present invention can obviously improve the abnormality of the solar cells, increase the photoelectric conversion efficiency of the cells (increase by 1.55%), and improve the qualified rate of finished products. The method is time-consuming, has high processing efficiency, and is highly operable.

Embodiment 3

[0026] The present invention is described by taking a single crystal as an example.

[0027] The electrical performance parameters of the abnormal sheet 3 are as follows: the series resistance Rs is 10 mΩ, the fill factor FF is 71%, and the efficiency is 16.2%.

[0028] After immersing the abnormal sheet in HF acid with a mass concentration of 1.5% for 90 seconds, rinse it with deionized water (65 seconds), and blow it dry with nitrogen; take the processed battery sheet to the sorting tester for re-sorting Selected test, the results are shown in Table 1, the product is qualified. It can be seen that the present invention can obviously improve the abnormality of the solar cells, increase the photoelectric conversion efficiency of the cells (increase by 1.5%), and improve the qualified rate of finished products. The method is time-consuming, has high processing efficiency, and is highly operable.

[0029] Table 1 Use HF acid to improve the electrical performance parameters of ...

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